There are no PHOTORECEPTORS in the OPTIC DISC located where the nerve fibers of the RETINA leave the eye and enter the OPTIC NERVE. This region is commonly called the BLIND SPOT.
The retina is an important layer of nervous tissue that covers the inside of the eye, in which the sensation of vision initiates.
Photoreceptors are specialized cells within the retina that respond to light stimuli. In the retina, there are two types of photoreceptor cells: cones and rods.
The blind spot is a small portion of the visual field of the eye that localizes in the optic disk within the retina.
There are no rods or cones (i.e. photoreceptor cells) within the optic disk.
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Which of the following statements apply to leukocytes? Select all that apply.
Multiple select question.
They eject major organelles when mature.
They are capable of protein synthesis.
They live approximately 120 days.
They retain their organelles throughout their life time.
They are not uniform in form and function.
Explanation:
leukocytes are white blood cells. mainly 4 killing bacterial infections.
Leukocytes are the specialized cells which are a part of blood. These are known as white blood cells. These protects the body. These produce antibodies. Thus, the correct options are B, D, and E.
What are Leukocytes?
Leukocytes are the white blood cells. These are a type of specialized cell type which is present in blood along with erythrocyte and plasma. Leukocytes are primarily responsible for protecting the body from pathogens and germs by producing antibody proteins which fight against these organisms.
Leukocytes are irregular in shape. They can change their shape to engulf or kill the bacteria which enters the blood to prevent disease. Erythrocytes change their shape which allows them to pass through the capillaries which are very tiny.
Therefore, the correct option is B, D, and E.
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In very extreme weather, the xylem cells are damaged as well. Describe how the plant is affected if the xylem is unable to function correctly.
Answer:
The plant will die
Explanation:
Xylem's job is to transport water and minerals from the soil to the parts of the plant. Without it the plant won't receive the required minerals and the plant will die.
what’s porosity
a) The ease with which water is able to flow from one pore to another in rock
b) A measure of the amount of ground water available in the water table
c) A measure of the amount of open space within unconsolidated sediment or rock
d) The ability of water to trickle down through soil until it reaches ground water
Answer:
C)
Explanation:
A measure of the amount of open space within unconsolidated sediment or rock.
Reactions occur within the sun to transform _____ energy into _______ energy.
Answer:
Chemical and light and thermal energy.
Explanation:
Reactions occur within the sun to transform chemical energy into light and thermal energy.
In the Sun, chemical energy transforms into light and thermal energy. Plants transform the Sun's light energy into chemical energy during the process of photosynthesis.
Hope this helps :)
Answer:
chemical and thermal energy
Tornado Effects on the Land
Answer:
They have a small effect
Explanation:
Because when you consider the size of the earth, tornadoes have a small effect on earth, that's your answer?
Answer:
Tornado Effects on the Land-well tornadoes strike are greatly impacted. Trees and plants can be uprooted, and diseases in the soil are spread.
Explanation:
DEADLY!!
20. Explain why it is important to cite the references you use in a scientific report.
Answer:
If you don’t cite where you got your information from, there could be horrible consequences. If you don’t cite your references and use that work as your own, your subject to plagiarism.
Explanation:
Answer:
If you don’t cite where you got your information from, there could be horrible consequences. If you don’t cite your references and use that work as your own, you are subject to plagiarism.
Explanation:
what is the chemical formula for the sugar carbohydrate produced by photosynthesis?
A. H2O
B. CO2
C. C6H12O6
D. O2
Answer: C
Explanation:
What do weather forecasters use to forecast the weather?
A. superstitions
B. beliefs
C. weather patterns
D. dreams
This model chose to include certain features and exclude other features. For example, this simulation only includes rabbits, wolves, and grass but there are other predators of rabbits and other food sources for rabbits. Why do you think the creators focused on these data elements and not others
The creator focused on these data elements and not others because he was trying to create a food chain instead of a food web.
In the ecosystem, the living and non-living things interact over time leading to exchange of energy.
A food chain can be defined as the steps through which energy transfer occurs in an ecosystem.
The energy flows from the producers (grass), primary consumers, (rabbits) and then the secondary consumers (wolves).
The energy flow is indicated with an arrow thus,
grass ---> rabbit -----> wolves.
Food chain, therefore includes linear sequence of organisms.
Food web on the other hand illustrates a complex feeding relationship within the ecosystem.
The food web is made up of a prey that can be eaten by more than one predator.
Therefore, even though there where other predators of rabbits and other food sources for rabbits, he chose only few features to create a food chain.
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Assume for the purposes of this problem that the order of and distances between three linked genes are the following: unc-32 10mu vab-7 20mu dpy-17 What is the probability of obtaining a phenotypic unc-32 vab-7 offspring from a cross between a heterozygous fly(unc-32 vab-7 dpy-17/ ) and the triple recessive nematode
From the distances between genes and their order, it is possible to get recombination frequencies per region (simple and double recombination frequencies). The probability of obtaining a unc-32 vab-7 + offspring is 0.09 = 9%.
---------------------
We are usually asked to get the order of genes in a chromosome. To do so, we need to get the distances between genes. And to get distances between genes, we need to get their recombination frequency.
When three genes are involved, we get the distances by taking the recombination frequency, P, per region.
We talk about regions, R, when we are making reference to the space between two genes.
Gene 1 -----(R1)----- Gene 2 --------(R2)------ Gene 3
P1 P2
P1 = recombination frequency between Gene 1 and Gene 2P2 = recombination frequency between Gene 2 and Gene 3⇒ P1 = (SR + DR) / N
⇒ P2 = (SR + DR)/ N
Where:
SR is the number of simple recombinants in each region, DR is the number of double recombinants in each region, and N is the total number of individuals.The genetic distance will result from multiplying that frequency by 100 and expressing it in map units (MU). One centiMorgan (cM) equals one map unit (MU).
In the exposed problem, we need to do the inverse way. We already have the order and distances between genes, and we need to get the recombination frequency, P.
We know that the order of genes is as follows,
unc-32 ------------- vab-7----------------- dpy-17
Distances are:
Region 1 = 10 MURegion 2 = 20 MUWe need to get the probability of obtaining a phenotypic unc-32 vab-7 + offspring from a cross between a heter0zyg0us fly (unc-32 vab-7 dpy-17/ + + + ) and the triple recessive nematode (unc-32 vab-7 dpy-17 / unc-32 vab-7 dpy-17).
Cross:
unc-32 vab-7 dpy-17 / + + + x unc-32 vab-7 dpy-17 / unc-32 vab-7 dpy-17
To get the genotype unc-32 vab-7 + , a simple recombination, SR, must occur in region 2.
So we need to get the simple recombination frequency in Region 2.
To do so, first we need to clear the following equation
Distance between vab-7 dpy-17 = P2 x 100 = 20 MU
20MU = P2 x 100
P2 = 20 / 100
P2 = 0.2
The recombination frequency in region 2 (P2) is 0.2.
Now, we need to get the simple recombination frequency in this region.
P2 = (SR + DR) / N
P2 = Simple recombinants Frequency + Double recombinants Frequency
R1 = 10 MUR2 = 20 MUDouble recombinants Frequency = 10% x 20% = 0.1 x 0.2 = 0.02P2 = Simple recombinants Frequency + Double recombinants Frequency
0.2 = Simple recombinants Frequency + 0.02
Clearing the equation,
Simple recombinants Frequency = 0.2 - 0.02 = 0.18
Simple recombinant frequency in region 2 will produce the following two chromosomes,
unc-32 vab-7 ++ + dpy-17So half of this frequency will produce one chromosome, and the other half will produce the other chromosome.
unc-32 vab-7 + ⇒ 0.09+ + dpy-17 ⇒ 0.09So, the probability of obtaining a phenotypic unc-32 vab-7 + offspring is 0.09 = 9%.
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positive and negative punishment are meant to?
Answer:
yessssssssssssssssssssss
The process of converting food so that it can be absorbed into the blood and used by the blood vessels
A. Peristalsis
B. Bowel Elimination
C. Constipation
D. Digestion
Answer:
The answer would be digestion
Explanation:
When food is digested, it's broken down into smaller pieces so its can convert into energy for our body.
hope this helps :3
How is a proton gradient formed across the inner mitochondrial membrane?
Answer:
Energy is released in these “downhill” electron transfers, and several of the protein complexes use the released energy to pump protons from the mitochondrial matrix to the intermembrane space, forming a proton gradient.
Explanation:
Which of the following statements best goes with the Law of Conservation of Energy
Explanation:
Just choose the one that is similar to that of this : Energy is neither created nor destroyed in a given system.
note -it is always unidirectional i.e - Goes in only one path.
How to find cane yield?
From an agronomical point of view, there is a lot that the grower can do to maximize sugarcane yield. Proper crop nutrition is an important factor to achieve this.
In a large number of cases, nutrients that drive sugarcane yield forward, will also improve the sugar content and quality of the harvested sugarcane crop.
Most required nutrients have specific roles to play in improving yield:
What is the nervous system composed of?
A. The central nervous system
B. The peripheral nervous system
C. The respiratory system
D. Answers A & B
Answer: D) the central and peripheral nervous systems
hope this helps
Which of the following systems does NOT excrete some form of waste ?
A: Urinary
B: Integumentary
Or C: Skeletal
Answer:
Option C is write answer
su**
HEHEHHEHEHEHEHHEHEHHEHHEHE HELP ASAP
the answer is A. voting.
how do the ranges for the marine bird and sea turtle species species compared
Answer: Varies
Explanation:
It's based on there being many different types.
What best describes main component of carbohydrates
Answer:
All carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen, and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates.
what is the main reason scientist do experiments?
A) to find out if a hypothesis is correct
B) to provide jobs for scientists
C) to find different ways to use lab equipment
D) to educate science students
Due to a recent drought, a farmer has lost quite a bit of soil on his fields because:
A) the rain has washed it away.
B) the animals have been trying to eat the soil due to lack of food.
C) the plants have absorbed the soil.
D) wind has carried away the dry soil.
Pls help
Answer:wind has carried away the dry soil
Explanation:
Indicater I need the meaning
Answer:
indicator can mean two different things,
1. a thing, especially a trend or fact, that indicates the state or level of something.
2. a gauge or meter of a specified kind.
Hope this heled!
Check all statements below that are true
All organisms must compete for survival.
When
organisms struggle to survive, they usually mutate
to
Some
organisms have phenotypes that make them better
increase chances of reproduction.
environment
competitors than others in their
Animals undergo natural selection, but plants and other organisms
Natural selection continues to occur even today
generally do not.
I
Phenotypes found In the most successful members of a species become the most prevalent after
several generations.
M
A decrease in food availability will increase the variation in a population.
Answer:
Statements thar are true:
Some organisms have phenotypes that make them better increase chances of reproduction.
Natural selection continues to occur even today
Phenotypes found In the most successful members of a species become the most prevalent after several generations.
Explanation:
It is not true that all organisms must compete for survival, sometimes the conditions are good and there is enough food or good climate conditions and that makes no need of competition an increase in the individuals of the species.
Animals undergo natural selection, this is a random natural phenomenon that can make plants and animals adapt better or worse to the enviromental conditions. This cause that the beneficiaries can adapt, survive and reproduce and became the most prevalent after generations.
Mutations are not phenomen that occur because the living being needs it, but rather they are phenomenon that occur at random at any time and determine the possibility of survival.
A decrease in food availability will do the contrary, decrease the variation in a population because it makes that only those who manage to adapt to eat another food survive, for example.
Answer:
A C E F
thats that ones
If a 1000 bp of DNA were inserted between the two restriction sites, how would the banding pattern on the gel differ from the one you drew in part a
Which of the following describe how seabird populations are affected by climate change?
Answer: Varies
Explanation:
It depends on the time of season at the given moment.
The gallbladder provides ________ that aid(s) in transport of lipids across the intestinal membrane.
The gall bladder provides bile salt.
The gall bladder is a small pear-shaped organ that is located at the abdomen inferior to the liver.
This organ stores and releases the bile salt produced from the liver.
The bile salt is released through the bile duct into the duodenum of the small intestine.
The bile salt is use to emulsify fat thereby aiding it's transport across the intestinal membrane.
Therefore, the gall bladder provides bile salt that aids in transport of lipids across the intestinal membrane.
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What is the most likely explanation for
the DNA found in mitochondria?
Answer:
Origin. Nuclear and mitochondrial DNA are thought to be of separate evolutionary origin, with the mtDNA being derived from the circular genomes of bacteria engulfed by the early ancestors of today's eukaryotic cells.
Explanation:
6. Which is not a product of photosynthesis? nitrogen glucose water oxygen
