what is cell membrane ?​

Answers

Answer 1

Explanation:

the thin outside layer that surrounds the cytoplasm of a cell and controls the movement of materials into and out of the cell. cell membrane.

hope it helps.stay safe healthy and happy....

Related Questions

What type of evolutionary adaptations did plants acquire to allow them to grow in areas that were not directly on a water source?

Answers

Answer:

Plants developed roots to absorb water from the ground

Answer:

Vascular seedless plants evolved specific structures to transport and hold fluids, reducing dependence on water sources.

Explanation:

If given the ability to hold on to water, the plant does not have to frow directly on a water source.

which best describes a bacterium

Answers

a unicellular prokaryote

Answer:

Bacteria

Bacteria are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Wikipedia

Explanation:

a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.

Which of the following is NOT an organ system in the human body?
A. Endocrine system
B. Replicatory system
C. Digestive system
D. Lymphatic system

Answers

B. The replicatory system is not a organ sytem in the human body.

The operation of the sodium-potassium pump moves ________. A) sodium and potassium ions into the cell B) sodium and potassium ions out of the cell C) sodium ions into the cell and potassium ions out of the cell D) sodium ions out of the cell and potassium ions into the cell

Answers

operation of SODIUM-POTASSIUM PUMP moves sodium ions out of the cell and potassium ions into the cell. The correct option is D.

When a cell membrane moves molecules or ions against a concentration gradient or against an electrical or pressure gradient, the process is called ACTIVE TRANSPORT. Different substances that are actively transported include:

--> sodium ions,

--> potassium ions,

--> calcium ions and

--> some amino acids.

There are two types of active transport which are divided according to the energy that is used to cause the transport. They include:

--> primary and

--> secondary active transport.

PRIMARY ACTIVE TRANSPORT

A typical example is the SODIUM-POTASSIUM PUMP( Na+ - k+). This is a transport process that pumps sodium ions outward through the cell membrane of all cells and at the same time pumps potassium ions from the outside to the inside. This pump helps to:

--> maintain the sodium and potassium concentration differences across the cell membrane

--> establish a negative electrical voltage inside the cells.

The mechanism or OPERATION of the pump involves the following steps:

--> two potassium ions bind on the outside of the carrier protein and three sodium ions bind on the inside,

--> ATpase of the carrier protein cleaves one molecule of ATP, splitting it to Adenosine diphosphate (ADP) and liberating a high-energy phosphate bond of energy.

--> this liberated energy then causes a chemical and conformational change in the carrier protein,

-->this leads to the extruding of three sodium ions (3Na+) to the outside and two potassium ions (2K+) to the inside.

Therefore in the operation of SODIUM-POTASSIUM PUMP moves sodium ions out of the cell and potassium ions into the cell. The correct option is D.

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What foods can you find nitrogen in

Answers

Answer:

Beets, Garlic, meat, dark chocolate, leafy greeens, citrus fruit, pomegranae, etc.

Explanation:

Why does having a genetically diverse population make a species more likely
to survive a change to the environment?
A. They are more likely to have harmful mutations.
B. They are more likely to become an invasive species.
C. They are more likely to reach carrying capacity.
D. They are more likely to have some individuals adapted for survival.

Answers

Answer:

D

Explanation:

When a population is genetically diverse there is a higher probability for some individuals in that population to survive during harsh conditions such as drought due to their highly resistant genes.

Tami is doing experiments on three different unknown solids. She understands that treating them in different manners might result in changes to their bonding, and these changes may help her identify unknowns. She treats samples of each solid four different ways: heating them, letting them cool, shining bright light on them, and hitting them once with a hammer. The chart shows what happened to each sample.



Based on how they each acted in the trials, which substance(s) would most likely be metallic?

A and B
B
C
A and C

Answers

the answer is (C)……….
the answer would be c

If a cell has 10 chromosomes when it begins mitosis, how many will it have immediately afterword?

Answers

Answer:

Explanation:

Therefore, there will be two daughter cells at the end of mitosis. Each will have 10 chromosomes, if the parent cell has 10. The chromsomes will not have sister chromatids because after mitosis, the duplicated pairs have separated into the two daughter cells. The cells will each be diploid, just as the parent cell was.

Explanation:

If a cell has 10 chromosomes when it begins mitosis, there are 15 will have immediately afterword.

An object moves 100m in 5sec, Calculate speed.
pls answer my question​

Answers

this is from g00gle
if it doesnt let you see its 44.74 mph

the systems involved in water content regulation are ________.​

Answers

Answer:

kidneys, hypothalamus, and endocrine glands.

Explanation:

I don't think theres anything to explain rlly hope this is correct tho

What is an advantage of electron microscopes compared to light microscopes?
They have a much higher power of resolution.
They can be used to view live specimens.
They are inexpensive and commonly found in classrooms.
They are helpful during dissections.

Answers

Answer:

They have much higher power of resolution.as compared to light microscope.

difference between diabetes mellitus and diuresis?? please help​

Answers

Explanation:

If you have been in EMS long enough, you may well have encountered a patient with diabetes insipidus. Like many, you may have assumed that it is a variant of the common disease diabetes mellitus. Actually, diabetes mellitus and diabetes insipidus are totally unrelated other than the name. The term diabetes is derived from Latin (originally Greek) and means “to go through or siphon,” referring to a large amount of urine produced by the kidneys. The term melitus, in Latin, means “sweet.”  

 

Jurassic park book summary

Answers

Answer:

En una isla remota, un grupo de hombres y mujeres emprende una carrera contra el tiempo para evitar un desastre mundial provocado por la desmedida ambición de comercializar la ingeniería genética. Pero todos los esfuerzos resultarán vanos cuando el inescrupuloso proyecto quede fuera de control y el mundo a merced de unas bestias monstruosas...

Explanation:

When a person runs his body temperature goes up why and how it comes to normal

Answers

Answer:

the average person today actually runs then you will notice that your skin temperature is going to go down not up

Explanation:

What do cells want to being in and what do cells want to keep out

Answers

Answer:

Cell membranes serve as barriers and gatekeepers. ... Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.

Explanation:

Hope it helps :)

a) What are the bases of mRNA coded for by this section of DNA, before the mutation? (1 point)


b) What are the bases of mRNA coded for by this section of DNA, after the mutation? (1 point)


c) What amino acid is coded for by this sequence before the mutation? (1 point)


d) What amino acid is coded for by this sequence after the mutation? (1 point)


e) Is this is a silent mutation or a missense mutation? Explain. (1 point)

Answers

Complete question:

A gene has a base sequence of GTC. Due to a mutation, the base sequence changes to GTG. Answer the following questions:

a) What are the bases of mRNA coded for by this section of DNA, before the mutation? (1 point)

b) What are the bases of mRNA coded for by this section of DNA, after the mutation? (1 point)

c) What amino acid is coded for by this sequence before the mutation? (1 point)

d) What amino acid is coded for by this sequence after the mutation? (1 point)

e) Is this is a silent mutation or a missense mutation? Explain. (1 point)

Answer:

a) mRNA before mutation ⇒ CAG

b) mRNA after mutation ⇒ CAC

c) amino acid before mutation ⇒ Glu, Glutamine

d) amino acid after mutation ⇒ His, Histidine

e) missense mutation

Explanation:

Theoretical frame

Transcription:

Transcription occurs in the nucleus where the template DNI strand is read in direction 3´→ 5´ to build the mRNA molecule in direction 5´→ 3´.

When the DNI molecule separates into two strands to form the transcription bubble, we can identify two separate segments: coding strand and template strand.

The coding strand goes in direction 5´ to 3´, while the complementary strand -template strand- grows in direction 3´ to 5´.

The template strand is the mRNA complement.

The coding strand is the same as the mRNA that results from the transcription of the same DNI segment -switching bases T for U-.

The coding strand receives that name because it is the sequence that codes for each amino acid composing the proteins.

Translation:

Translation occurs in the cytoplasm. rRNA and tRNA read mRNA in the direction 5´→ 3´ to build the protein.

Genetic information for the aminoacids assembly during the protein synthesis is stored in short sequences of three nucleotides named codons in the mRNA. Each of the codons represents one of the 20 amino acids used to build the protein. There are 64 codons in total, from which 61 codify for amino acids. Because there are 20 amino acids, many codons code for the same amino acid. One of these amino acids is also the start point of protein synthesis. And the left three codons are stopping translation points.

The codons indicating the initiation or stop points during the translation process are:

• The start codon AUG is the most common sequence used by eukaryotic cells

• The end codons are UAA, UAG, UGA.

When a change occurs in a single base pair, it is known as a point mutation. Points mutations might be either silent, missense, or nonsense. In silent mutations, the resulting mRNA codon codes for the same amino acid as the unmutated sequence. However, if the mutation causes the mRNA codon to code for a different amino acid, this mutation is a missense mutation. Finally, if the mutation causes mRNA codon to be a stop codon, we are referring to a nonsense mutation.

----------------------------------------------------------------------------------------------------------

In the exposed example,

Before mutation

Original DNI base sequence ⇒ GTC ⇒ Guanine, Timine, CytokineTranscripted mRNA sequence ⇒ CAG ⇒ Cytokine, Adenine, GuanineAmino acid ⇒ Gln ⇒ Glutamine

After mutation

Mutated DNI base sequence ⇒ GTG ⇒ Guanine, Timine, GuanineTranscripted mRNA sequence ⇒ CAC ⇒ Cytokine, Adenine, CytokineAmino acid ⇒ His ⇒ Histidine

This is a point mutation, in which the change occurs in a single base pair. The mutation made the mRNA codon code for a different amino acid, meaning that this is a missense mutation.

Before mutation, the mRNA codon is CAG and codes for Glutamine.After mutation, the mRNA codon is CAC and codes for Histidine.

When does puberty occur? What causes the changes that occur during puberty?

Answers

Answer:

When does puberty start? Puberty starts when changes in your child's brain cause sex hormones to start being released from the gonads, which are the ovaries and testes. This typically happens around 10-11 years for girls and around 11-12 years for boys.Skip

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What is puberty?

Puberty is the time when your child moves through a series of significant, natural and healthy changes. These physical, psychological and emotional changes are a sign that your child is moving from childhood towards adulthood.

Changes in puberty include:

physical growth and development inside and outside children’s bodies

changes to children’s sexual organs

brain changes

social and emotional changes.

When does puberty start?

Puberty starts when changes in your child’s brain cause sex hormones to start being released from the gonads, which are the ovaries and testes.

This typically happens around 10-11 years for girls and around 11-12 years for boys.

But it’s normal for the start of puberty to range from 8-13 years in girls and 9-14 years in boys.

There’s no way of knowing exactly when your child will start puberty. Early changes in your child’s brain and hormone levels can’t be seen from the outside, so it’s easy to think that puberty hasn’t started.

Puberty can be completed in about 18 months, or it can take up to 5 years. This range is also completely normal.

Girls: key physical changes in puberty

In girls, these are the main external physical changes in puberty that you can expect.

Around 10-11 years

Breasts will start developing. This is the first visible sign that puberty is starting. It’s normal for the left and right breasts to grow at different speeds. It’s also common for the breasts to be a bit tender as they develop. If your child wants a bra, a soft crop top or sports bra can be a good first choice.

A growth spurt occurs. Some parts of the body – like the head, face and hands – might grow faster than limbs and torso. This might result in your child looking out of proportion for a while. On average, girls grow 5-20 cm. They usually stop growing at around 16-17 years.

The body shape will change. For example, a girl’s hips will widen.

The external genitals (vulva) and pubic hair will start to grow. Pubic hair will get darker and thicker over time.

Around 12-14 years (about two years after breast development starts)

Hair will start growing under the arms.

A clear or white discharge from the vagina starts several months before periods start. If the discharge bothers your child, you could suggest your child uses a panty liner. If your child says it’s itchy, painful or smelly, consult your GP.

Periods will usually start within 2 years of breast growth starting, but can take up to 4 years.

Boys: key physical changes in puberty

In boys, these are the main external physical changes in puberty that you can expect.

Around 11-12 years

The external genitals (penis, testes and scrotum) will start to grow. It’s normal for one testis to grow faster than the other. You can reassure your child that men’s testes usually aren’t the same size.

Pubic hair will start to grow. It will get darker and thicker over time.

Around 12-14 years

Your child will have a growth spurt. Your child will get taller and their chest and shoulders will get broader. Some parts of your child’s body – like their head, face and hands – might grow faster than their limbs and torso. This might result in your child looking out of proportion for a while. On average, boys grow 10-30 cm. They usually stop growing at around 18-20 years.

It’s common for boys to have minor breast development. If your child is worried by this, it might help your child to know it’s normal and usually goes away by itself. If it doesn’t go away or if the breasts seem to be growing a lot, consult your GP.

Around 13-15 years

Hair will start growing on other parts of your child’s body – under the arms, on the face and on the rest of the body. Leg and arm hair will thicken. Some young men will grow more body hair into their early 20s.

The hormone testosterone is produced, which stimulates the testes to produce sperm.

Your child might start having erections and ejaculating (releasing sperm). During this period, erections often happen for no reason at all. Just let your child know that this is normal and that people don’t usually notice. Ejaculation during sleep is often called a ‘wet dream’.

Around 14-15 years

The larynx (‘Adam’s apple’ or voice box) will become more obvious. Your child’s larynx will get larger and their voice will ‘break’, eventually becoming deeper. Some boys’ voices move from high to low and back again, even in one sentence.

Answer:

For girls, puberty typically occurs between the ages of nine and thirteen

For boys, puberty typically occurs between the ages of ten and fifteen.

An increase in hormones – estrogen and progesterone in girls and testosterone in boys – causes the changes that happen during puberty.

Explanation:

Complete a dichotomous key for the 10 leaves on the common leaves sheet

Answers

A dichotomous key might be considered a significantly useful tool to classify organisms. The key provides an easy and fast way for identification by describing different morphological traits, leading you to the correct taxonomic classification.

When you have an organism -or part of it-, and you need to identify it taxonomically, you use a dichotomous key. The key provides morphological descriptions about different taxonomic groups in an easy way to identify these traits in your individual.

It is simple to read a dichotomous key. The term dichotomous refers to how information is provided. You will always have two options (a and b, or 1 and 2), and you will have to choose one of them according to the characteristics of your organism. The key describes specific morphological traits of organisms that are useful for differentiation.

Probably you might need an atlas or a dictionary to understand some of the technical terminologies. You will also need to carefully observe your specimen, to get to distinguish different traits. If the specimen is too small you might need a loup.

Let us analyze simple example using a group of 5 organisms. Let us assume that you do not know their names, and you need to know what is the individual in the red circle (You will find it in the attached files).

Dichotomous key

Statement 1a ----------- The organism is a vertebrate ----------- Frog

Statement 1b------------ The organism is invertebrate ----------- Go to 2

Statement 2a ---------- The organism has a multisegmented

                                    and elongated body, with too many  ----- centipede

                                    legs.

Statement 2b ---------- The organism has a relatively short body

                                    and with fewer legs ------------------------------ Go to 3

Statement 3a ----------- The organism has 8 legs ----------------------- Spider

Statement 3b ----------- The organism has 6 legs ----------------------- Ant

As you can see, this a very simple example, but ilustrates how the key provides enough information for you to reah the correct option.

Related link: https://brainly.com/question/22714283

Answer:

do not use exactly. It will reset your assignment for plagiarism.

Explanation:

Which part of the
upper respiratory
system is designed to
interact with food and
air?
A. larynx
B. nose
C. pharynx
D. trachea

Answers

Answer:

C.Pharynx

Explanation:

what are chromosomes
A. strands I'd DNA wrapped around proteins.
B. The alleles that cause certain traits.
C. Any organism that cause contains DNA
D. A form of virus that infects cells.​

Answers

Answer:

A. strands I'd DNA wrapped around proteins.

Explanation:

DNA is securely packed within the nucleus by chromosomes, which are thread-like structures. Histone proteins offer structural support for DNA by coiling it around them. During cell division, chromosomes assist in the replication and distribution of DNA. Each chromosome has a centromere, which separates the p (short) and q (long) arms. The centromere is found at the constriction point of the chromosome, which may or may not be the center.

OAmalOHopeO

Pretty sure it’s answer A my mans

PLS HELP
what reproductive process do bacteria use by forming two identical cells from one parent cell?

a. binary fission
b. fragmentation
c. vegetative propagation
d. fertilization

pls answer quick , i have a time limit and i need help

Answers

Answer:

A. Binary Fission

Explanation:

During binary fission, the chromosome copies itself, then it forms two genetically identical copies.

Select the correct answer from each drop-down menu. Some plants rely on the wind to reproduce. An example is the . It’s important for plants to use the forces of nature to reproduce because they .

Answers

Answer:

white tuft of dandelion seeds

They cannot move around freely

I hope this helps

22. An astronaut on the space station tests whether gravity affects the productivity of tomato plants. What
is the independent variable in this experiment?

Answers

When conducting an experiment, the independent variable is always the one that produces or causes an effect or reaction on the dependent variable. In the exposed situation, the independent variable is gravity.

--------------------------------------

During an experiment, you need to consider all the variables involved.

Independent (manipulated) variable: Refers to all the variables in an experiment that provoke a response in another variable. An independent variable is the one that changes or is controlled and modified to analyze how another variable responds to it. The researcher changes the independent variable to observe its effects on the dependent variable. Usually, the independent variable is represented by the X letter. In the exposed example, gravity is the independent variable, and influences the productivity of tomato plants. Dependent variable: Refers to the variable, which response depends on any change in the independent variable. It represents a quantity of something which value depends on how the independent variable is modified. The change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. It is usually identified by the letter Y. Controlled variables are kept constant in the control groups and the experimental groups. Unlike the independent variable, the controlled variables do not influence the results. These variables do not affect the response of the dependent variable.

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You are part of a research group that is attempting to improve on the beneficial genetic modification of golden rice, to
further reduce global hunger issues. Which of the following is NOT a benefit you would see?
A. Rice crops growing in areas that were previously too harsh to grow in
OB. Cheaper rice crops
C. Larger rice crop yields
D. Rice crops that can also be put in fermenters to produce useable proteins

Answers

Answer:

A

Explanation:

The following that is NOT a benefit you would see is Rice crops growing in areas that were previously too harsh to grow in. Option A. This is further explained below.

What is genetic modification?

Generally, Genetic modification (GM) refers to a technique that allows for the introduction of foreign DNA into an organism's genome.

In conclusion, One drawback you would not experience is the cultivation of rice in climates where it was previously unfeasible to do so.

Read more about genetic modification

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which of the following is true for a eukaryote?

A. it is one of the first life forms to appear on earth.

B. it doesn't have a nucleus and organelles.

C. it must be a multicellular organism.

D it evolved from prokaryotes

Answers

Answer:

D it evolved from prokaryotes

Explanation:

let me know if you have any questions

Which of the following best depicts the use of Geographic Information Systems?

City planners using layered maps to decide where to build a park
Wireless routers providing internet signal


Government workers constructing a new interstate highway system


Retail stores advertising a new product

Answers

Answer:

City planners using layered maps to decide where to build a park

Explanation:

They are using the GIS data layering method...different aspects ir layers of an area are taken into consideration

For example they would look at schools close by, rivers and soil type. By combining those three characteristics they could make a choice of the best possible area a park should be built.

Que tipo de ecosistema tienen los pingüinos emperador y Adelia?

Answers

Answer:

Los pingüinos Adelia viven en el continente antártico y en muchas pequeñas islas costeras circundantes. Pasan el invierno en alta mar en los mares que rodean el hielo antártico.

Los pingüinos emperador viven exclusivamente en entornos antárticos gélidos. Prefieren reproducirse durante el invierno, cuando el hielo se congela y se estabiliza. Estos pingüinos suelen crear colonias de reproducción en áreas cercanas a icebergs y acantilados helados, que los protegen de los peores vientos fuertes.

Explanation:

te ayuda esto?

Which of the following is not a source of atmospheric carbon?
O Fossil fuel burning.
O Dead decaying trees in a forest.
O Oceans releasing CO2 into atmopshere as the water gets warmer.
Plant cell respiration.

Answers

Answer:

fossil fuel doesnt need atmospheric carbon for burning


You need to include more of which nutrient in your diet as compared to your
grandmother and why ?

Answers

Calcium and Vitamin D. Adults older than 70 need more calcium and vitamin D to help maintain bone health than they did in their younger years. ...

oil-rich countries in the middle east cover about 4% of earth's total land area but posses about 48% of the world's known oil reserves. what is the main reason for high concentration of reserves in this part of the world?

Answers

The correct answer is A. Geological processes.

Explanation

Oil is a hydrocarbon of fossil origin by geological processes that transforms large amounts of organic matter deposited on anoxic bottoms of seas or lake areas of the geological past, which were later covered by heavy layers of sediment. This causes organic materials to be transformed into oil by the heat and pressure of the upper layers. However, this phenomenon does not occur in all parts of the earth because in some, as in the case of the Middle East, there were large amounts of organic matter that became an oil reserve. So the correct answer is A.

Other Questions
Elana runs for 28 seconds and finishes at 250 meters .what is her velocity Trial 1: Heat 30.0 grams of water at 0 C to a final temperature of 40.0 C.Trial 2: Heat 40.0 grams of water at 10.0 C to a final temperature of 40.0 C.Which statement is true about the experiments? (5 points)The same amount of heat is absorbed in both the experiments because the product of mass, specific heat capacity, and change in temperature are equal for both.The same amount of heat is absorbed in both the experiments because the heat absorbed depends only on the final temperature.The heat absorbed in Trial 2 is about 3,674 J greater than the heat absorbed in Trial 1.The heat absorbed in Trial 2 is about 5,021 J greater than the heat absorbed in Trial 1. Cassie becomes ill several hours after eating a meal consisting of plain mashed potatoes and spicy hot wings. She is more likely to develop a taste aversion to ____________________ as a result of... Group of answer choices spicy hot wings; overshadowing mashed potatoes; latent inhibition spicy hot wings; blocking mashed potatoes; overshadowing Help Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) andare ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload eachfile separately. When Target decides the number and locations of warehouses it needs to build and operate, it is addressing the _______ element of the marketing mix. 36x^2=y^2Does the equation define y as a function of x ? im honestly stuck in this question True or false: The initial result of the Hawthorne studies demonstrated that no matter what the levels of light and noise were, worker productivity increased simply because the workers liked the attention they received by being part of a study. List and explain the type of networking In parallelogram BCDE if mCB7050E Which of the following is the best definition of anaerobic respiration? Question 2: Heat (5 points) A. Describe the following heat equations, and identify the indicated variables.i. Q = mcT; identify c. (1 point)ii. Q = mLvapor; identify Lvapor. (1 point)iii. Q = mLfusion; identify Lfusion. (1 point) Write the balanced reaction for the methanol cannon demo that includes their Lewis structures . The reaction is the combustion of methanol (CH3OH). Include the states (s, l, g) in your balanced equation as well. How does the flashback to Abuela's life in Cuba affect the story?It creates a mystery having to do with why Abuela and Alejandro didn't stay in touch after Abuela 's family left Cuba.It sets up a surprise at the end of the story, where the reader learns that Alejandro, a boy Abuela loved in Cuba, has been writing the letters. It provides a suspenseful subplot by showing how Abuela's family escaped from Cuba.The flashback of the incident of young love between Abuela and Alejandro is the resolution to the story. Find the sum of the Arithmetic series 2+5+8+............20th term Graph: y = (x + 3)2 4Which values are solutions of the quadratic equation0 = (x + 3)2 4? Check all that apply.yX-4WIEC60 -5-4.0 -3-1-6-4-2246023-2 -40,5-6 My bad am not to good at this app just started using it i need help with this one Amortization.Loan Consolidated Incorporated (LCI) is offering a special one-time package to reduce Custom Autos' outstanding bills to one easy-to-handle payment plan. LCI will pay off the current outstanding bills of $242 comma 000 for Custom Autos if Custom Autos will make an annual payment to LCI at an interest rtae of 9 % over the next 5 years. a.What are the annual payments of the loan? b.What is the amortization schedule for this loan if Custom Autos wants to pay off the loan before the loan maturity in 5 years? c.When will the balance be half paid off? d.What is the total interest expense on the loan over the 5 years? President Franklin Roosevelts domestic program, called the Marcia Baker ships orchids and other perishable flowers from her greenhouses near San Francisco to florists thousands of miles away in cities such as New York, Boston, and Philadelphia. Since the flowers must reach the florists as quickly as possible, the best mode of transportation for Marcia to use would be Multiple Choice railroads. trucks. air. ships.