What is the first step in DNA replication?
a
A new strand of DNA is created.
b The DNA helix unwinds like a zipper.
The two strands of DNA rewind into the double
helix.
d
none of the above

Answers

Answer 1

Answer:

B

Explanation:


Related Questions

What kind of inheritance is horse color an example of?

A. Complete dominance
B. Incomplete dominance
C. Co-dominance

Answers

i think the answer would be a , because of the certain color is more popular than an another based on the the gene but i can be completely wrong , correct me if i am :)

During which phase of mitosis do the chromosomes pull away from the middle of the cell?

Answers

In Anaphase of mitosis chromosomes pull away from the middle of the cell.

During this period the replicated chromosomes are split and moved to the opposite poles of the cells.

What is mitosis?

It is the process by which cell replicates its chromosomes and then segregates them, producing two identical nuclei in preparation for cell division.

What are chromosomes?

It is along DNA molecule with part or all of the genetic material of an organisms.

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1. How is natural selection related to the process of evolution?

Answers

Answer:

Natural selection is related to the process of evolution because It is one of the processes that drives change and helps to clarify the diversity of life on Earth.

Explanation:

Hope that helps

Which of the following processes cycles matter through different parts of an ecosystem?
More than one answer may be correct.
1. the nitrogen cycle
2. the water cycle
3. the carbon cycle

Answers

Answer:

the nitrogen cycle, the water cycle, and the carbon cycle

Explanation:

The water, carbon, and nitrogen cycles move nutrients through the different parts of an ecosystem. Water moves through organisms and the environment in different phases. Carbon moves through an ecosystem in carbon dioxide, minerals, and organic compounds. Nitrogen moves through an ecosystem in nitrogen gas, ammonium, nitrates, and organic compounds.

The biogeochemical cycle is a pathway that circulates the chemicals through the abiotic and the biotic factor. The nitrogen, water, and carbon cycle through various regions of an ecosystem.

What is a biogeochemical cycle?

The biogeochemical cycle is the movement of the chemicals and compounds of carbon, nitrogen, and water in the biosphere (biotic) and the atmosphere, lithosphere, and hydrosphere (abiotic) spheres of the earth.

These cycles move the nutrient through different spheres in the form of inorganic and organic compounds. It is an essential part of the ecosystem as they regulate the flow of the natural elements.

Therefore, option 1. nitrogen cycle, option 2. water cycle, and option 3. carbon cycle move through various parts of an ecosystem.

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Which of the following are sources of extra nutrients that can cause algae to overgrow in water due to HUMAN activity? CAREFULLY select all options that apply. List the answers.


dissolved oxygen in water

treated waste water

viruses

combined sewage overflow (CSO)

fertilizers

cleaning products

dog poop on the streets of NYC

water running over rocks


(This is 7th grade science)

Answers

I’m not sure about the rest but I think Dog poop is one

What absorbs water in the digestive system

Answers

Your answer is Small Intestine.

Your small intestine makes digestive juice, which mixes with bile and pancreatic juice to complete the breakdown of proteins, carbohydrates, and fats. Bacteria in your small intestine make some of the enzymes you need to digest carbohydrates. Your small intestine moves water from your bloodstream into your GI tract to help break down food. Your small intestine also absorbs water with other nutrients.

Answer: Small intestine

Either you put small intestine in the wrong place, or you're able to put the same one for multiple questions

⚠️Second time posting this⚠️
Geneticists use Punnett Squares to show all the possible outcomes of a genetic cross and to determine the probability of a particular outcome.
True
or
false

Answers

Answer:

True

Explanation:

Scientists only use punnet squares if they want to determine what the possible outcomes will be for the offspring.

Hope this helps, if it is wrong, I am sorry. T^T

Answer:

   true

Explanation:

What portions of RNA are cut out and discarded during the process of RNA editing

Answers

Answer:

 introns are portions of RNA that are cut out and discarded.

Explanation:

What molecule do organisms obtain energy from

DNA
ADP
Sugar
ATP
All the above.

Answers

Organisms mainly use the molecules glucose and ATP for energy. Glucose is a compact, stable form of energy that is carried in the blood and taken up by cells. ATP contains less energy and is used to power cell processes. The flow of energy through living things begins with photosynthesis, which creates glucose.
Answer:
ATP

Explanation: as the other person said they mainly use glucose or ATP for energy. Adenosine triphosphate (ATP) is the source of energy for use and storage at the cellular level. The structure of ATP is a nucleoside triphosphate, consisting of a nitrogenous base (adenine), a ribose sugar, and three serially bonded phosphate groups.

I hope this helped !

Is a chicken egg biotic (living) or abiotic (non-living)? *
biotic (living)
abiotic (non-living)

Answers

Answer:

its biotic

Explanation:

Chicken egg is biotic.

What are biotic or abiotic components?

Biotic components are living organisms while abiotic components are nonliving organisms. All biotic components are living components of ecosystem. Bacteria and birds, animals  are living components.

Abiotic components are non living components. sunlight, water and temperature are the non living components. Biotic factors are producers, herbivores and omnivores.

Abiotic components are physical and chemical components that act on the living components. In chicken cell the yolk which is living cells.

Biotic components also include the waste from living things and dead organisms. Earth have many biotic components. The surface of Mars has no biotic components.

Therefore, Chicken egg is biotic.

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A cactus with the genotype Kkww is crossed with a cactus with the genotype KKWw. Which of the following genotypes will be shared by 25% of the offspring?
A. KKWW
B. kkWw
C. KKww
D. KkWW

Answers

Answer: C

Explanation: Think of it this way, which ever has the most is what answer would be. So they come across 3 capitals with K its gonna be KK not kk.

Hope this helps

The genotype is defined as the genetic makeup of an organism, or the set of alleles. The cross between Kkww and KKWw will result in 25% of the progeny having genotype KKww.

The correct option is:

Option C. KKww

Find the attachment for the Punnett square, given below.

The cross between Kkww and KKWw will result in the gametes as:

Kkww - Kw, Kw, kw, kwKKWw - KW, Kw, Kw, kw

The progeny having genotype as KKww will be 4 or 25%.

Therefore, Option C is correct.

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What abiotic factors might affect a population of fish? Check ALL that apply.

clear water
light
temperature
food

Answers

Answer:

Clear water, light, and tempature.

Explanation:

Which organelles digest waste materials and worn out organelles?
O cell membrane
O chloroplast
nucleus
O lysosome
cell wall
O cytoplasm
mitochondria
O vacuole

Answers

Answer:

Lysosomes

Explanation:

break down food molecules, waste products, and old cells.

Write down important details about the immune system

Answers

Answer:

lungs,heart, stomach, and livers

Explanation:

I thinks what an immune system is

Answer:

important details about the immune system : it protects organisms from diseases, it can be self-distructive, white cells make your immune system work , and sleepless night hurt your immune system

Explanation:

I'll give you a cookie if answered

Answers

Answer:

a mutation

Explanation:

becaus ethere are diffrent traits wich would be a mutation im in middle school i learned this is 2 so trust me.

Answer:

variation

Explanation:

Any difference between individual organisms or groups of organisms of any species caused either by genetic difference or by the effect of environmental factors is called variation. Variation is observed in physical appearance, metabolism, behavior, learning and mental ability, and other visible characters of an individual.

Identify the labeled structures.
A: B: C: D: E:
The multiple questions are the same for each question. Please help!

Answers

Answer:

e cell wall that is the only one I am sure of because I can hardly see the rest

Which of the following provides the best summary of the process of natural
selection?
A. Populations become better adapted to their environment.
B. Individuals pass on their best traits to their offspring.
C. Individuals always change in response to their environment.
D. Population sizes increase with every generation.
SUBMI

Answers

Answer:

c

Explanation:

What is osmoregulation?

Answers

Answer:

adalah penghijauwan kota

Osmoregulation is the active regulation of the osmotic pressure of an organism's body fluids, detected by osmoreceptors, to maintain the homeostasis of the organism's water content; that is, it maintains the fluid balance and the concentration of electrolytes (salts in solution which in this case is represented by body fluid) to keep the body fluids from becoming too diluted or concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis.[1] The higher the osmotic pressure of a solution, the more water tends to move into it. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water.

Organisms in aquatic and terrestrial environments must maintain the right concentration of solutes and amount of water in their body fluids; this involves excretion (getting rid of metabolic nitrogen wastes and other substances such as hormones that would be toxic if allowed to accumulate in the blood) through organs such as the skin and the kidneys.

Which component of a galaxy consists of tiny particles that look smoky or cloudy and can be found in the space between stars? A) Gas B) Stars C) Dust D)Sun

Answers

Answer: Gas

Explanation:

Look through the lesson lol i know your school

Nebulae are different luminous regions of the interstellar medium that can be made up of cosmic dust as well as ionized, neutral, or molecular hydrogen, hence option C is correct.

What is dust?

All the stuff between stars is referred to as interstellar matter by astronomers, and the complete collection of interstellar matter is referred to as the interstellar medium (ISM). Some interstellar material is gathered into massive clouds that are each referred to as a nebula.

Tiny pieces of solid matter drifting about in the region between stars make up cosmic dust. It's not like the dust you find in your home; instead, it has tiny particles that range in size from collections of just a few molecules to grains that are 0.1 mm in size.

Therefore, an interstellar medium can be made up of cosmic dust as well as ionized, neutral, or molecular hydrogen, hence option C is correct.

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The purpose of the control is to ..?

Answers

The control group is used as the constant variable

23. Which of the below names is not a type of biologist?
a) paleontologist
b) botanist
I
c) zoologist
d) astrophysicist
BA

Answers

Answer:

D

explanation: it literally has physics in its name

The photo shows a student using email.
What is the main need or want this wave technology meets?
A. To hear and see others in real time
B. To efficiently communicate with others
c. To speak with and see others who are far away
O D. To efficiently store and share music with others

Answers

Answer:

B. To efficiently communicate with others

Explanation:

picture

Answer:

B

Explanation:

Unzips the DNA strand by breaking hydrogen bonds

Answers

HELICASES unzips the dna at the beggening of replication to then break the hydrogen bonds

1. Why is it important to have some access to water?

2. What physical and social factors can contribute to making water unte?

3. Why is it not safe to drink the water in the Attowopikat First Nation community

4. What would be sustainable solution to the problem of unsafe drinking water in Attawapiskat?

Answers

Answer:

1.Water is obviously essential for hydration and for food production—but sanitation is an equally important, and complementary, use of water.

2.Sedimentation.

Runoff.

Erosion.

Dissolved oxygen.

3.Ontario First Nation of Attawapiskat isn't safe. It has high levels of a chemical byproduct produced by the chlorination process in the community's ailing water plant that needs millions of dollars in repairs.

4.Boiling. This is a reliable way to purify water.

Use of Iodine solution, tablets or crystals. This is an effective and more convenient method. ...

Use chlorine drops. Chlorine has the ability to kill bacteria in water. ...

Use water filter. ...

Use Ultraviolet Light.

What type of energy has to do with a change in temperature?

Answers

Answer: changes in heat energy change temperature

Explanation: heat energy can be thought of as energy in individual atoms or molecules, which vibrate more as energy increases. Temperature is a measure of heat energy. For example, many substances expand as heat energy causes it atoms/molecules to vibrate more and occupy more space. We can use this property to measure energy as temperature by using the expansion of a liquid as in thermonmeters.

What are the advantages and disadvantages to produce few offspring that are extensively cared for and protected?

Answers

Advantages: Since they’re well cared for, they will grow up to be strong and hopefully produce healthy offspring.
Disadvantages: Fewer of them means that when one is lost, it will have a greater effect on the group. They also cannot reproduce as quickly as if they had lots of offspring.

The National Academy of Sciences reported that the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century. This is an example of a change in Earth's

Answers

Answer:

Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people burning fossil fuels.

please help meeeeeeeeeee

Answers

Answer:

D

Explanation:

D like the person above

If the process of meiosis shown to the right proceeds
normally, how many
chromosomes will cells A, B, C, and D have?
B

Answers

Answer:

If I’m correct it’s 15

Explanation:

Water makes up a large percentage of the body's cells. For a cell to remain in homeostasis, there must be a
mechanism to control water changes in the cells. The movement of water from an area of high water concentration
an area of low water concentration is
a. diffusion
b. osomosis
c. active transport
d. stable transport
so which one really is it....

Answers

Answer:

B. Osmosis

Explanation:

Osmosis
Hope this helps
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