Which of the following occurs before mitosis and meiosis?*

a. homologous chromosomes pair up

b. sister chromatids cross over

c. DNA is copied once

d. synapsis occurs


Answers

Answer 1

Answer:

c.dna copied once before mitosis and meiosis occur.


Related Questions

Transpiration is the evaporation of water from the surface of a plant. Explain.

Answers

Answer:

Transpiration is the loss of water from a plant in the form of water vapor. Water is absorbed by roots from the soil and transported as a liquid to the leaves via xylem. In the leaves, small pores allow water to escape as a vapor. Of all the water absorbed by plants, less than 5% remains in the plant for growth.

1. What happens to the products of the Krebs cycle?

Answers

the products of the Krebs cycle drive the electron transport chain and oxidative phosphorylation, both of which occur in the inner mitochondrial membrane.

DNA _____.
is a long, single chain of nucleotides
cannot determine behavior traits
contains coded information for the creation of proteins
is enclosed by a nuclear membrane in prokaryotes

Answers

Answer:

Answer:

The correct answer would be "contains coded information for the creation of proteins".

DNA or deoxyribonucleic acid is a polymer of nucleotides.

It is the genetic material in most of the living cells present on earth. That is, it controls all the characters and traits of the living organisms.

In prokaryotes, it keeps floating in the cytoplasm whereas it is confined in the well-defined nucleus in eukaryotic cells.

The nucleotide sequence of the DNA is used as the code for the synthesis of the proteins.

It is first transcribed into the nucleotide sequence of mRNA which is further decoded into the amino acid sequence of the proteins.

Contains coded information for the creation of proteins

4. Which evidence did Darwin NOT use to support his theory of evolution?
a. Observations of fossils
b. Finches on different islands had different types of beaks
c. Young finches that acquired desirable traits as they aged
d. Observations of different species with varying traits

Answers

Answer:

The answer, I believe, is a.

Explanation:

Observations of fossils came later I believe. :)

What change led to an increase in the number of light-colored moths within the population?

More mutations
Decreased pollution
More dark colored trees
fewer humans

Answers

Answer:

decreased pollution

Explanation:

The article

How do you think new proteins affect the fitness of children?
А
They have no effect on fitness
B
They increase fitness
C
They decrease fitness
D
All of the above

Answers

Answer: D of the above

Explanation: I am assuming this is for a gizmo because I had this same question. The correct answer for me was D.

New proteins affect the fitness of children as They increase fitness (option b )

Proteins

Protein are biochemical molecular substances made up of chains of Amino acids and are important part of a healthy diet. They are made up of chemical 'building blocks' called amino acids. Our body uses amino acids to build and repair muscles and bones and to make hormones and enzymes. They can also be used as an energy source

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You've just returned to school from spring break and all of the plants around your classroom are wilted and looking bad. What do you think happened ? Use your knowledge of plant cells to explain . Can they recover ?

Answers

Answer:

Nobody was there to water them so they all died. No I do not think they could be revived or recover.

Explanation:

none needed

Please help me fr !!

Answers

Answer B, cause there is no BB there is only 2Bb and there is only 2bb

What molecule is removed during dehydration synthesis? *
a. Water
b. Carbon dioxide
c. Sugar
d. Carbon

Answers

The answer would be A.

During dehydration synthesis, water molecule gets removed. The correct option is a.

What is dehydration?

A dehydration reaction in chemistry is a chemical process in which the reacting molecule or ion loses water. The opposite of a hydration reaction, dehydration reactions are frequent processes.

"Chemical processes known as dehydration reactions are those in which a water molecule is removed from the reactant molecule. Dehydration synthesis is the process of combining two compounds while removing water molecules.

These kinds of reactions can assemble and disassemble nucleic acids, proteins, and carbohydrates, however the monomers in each case vary.

Many polymers are made by dehydration processes as well. Another illustration is the transformation of alcohols into ethers.

Thus, the correct option is a.

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"Fossil" is Latin for "prehistoric record." True or false

Answers

Answer:

i think it is false

Explanation:

Which of the following physical traits are shared by both plants and animals? [Will pick Brainliest]

A) They both utilize identical sexual organs
B) Flowers
C) Color
D) They both utilize protective structures

[iCEV Agriscience]

Answers

Answer:

(A)

Explanation:

can't be flower

can't be color

can't be protective structure

a flower has the ovary which animals have too

ANSWER AND I WILL GIVE BRAINLIEST AND POINTS!

Answers

Answer:

A DNA marker

Explanation:

also known as a size standard or a DNA ladder) is loaded into the first well of the gel. The fragments in the marker are of a known length so can be used to help approximate the size of the fragments in the samples.


7. Name TWO reasons why photosynthesis is an important process.
.
*​

Answers

Answer:

1. It creates oxygen for humans and animals to breath.

2. It creates food for humans and animals.

Have a good day! or not...its up to you- <3

• It is the number one source of oxygen in the atmosphere.


• It contributes to the carbon cycle between the earth, the oceans, plants and animals.


I hope it helps
Stay home stay safe !!

which of carbs, fats ,minerals, proteins, vitamins, water are organic and which are inorganic

Answers

Whereas vitamins are organic substances (made by plants or animals), minerals are inorganic elements that come from the soil and water and are absorbed by plants or eaten by animals.

If a population pyramid has a very broad base then what does that tell you about the population it represents?

Answers

Answer:

A population pyramid is defined as a graphical representation that shows distribution of both genders male and female in all age groups.

The base of a population pyramid represents the birth rate, so a very broad base represents the higher population of younger age children and higher birth rate.

Hence, the wide base shows higher population of younger age children and higher birth rate.

This term means that the tissue has a large blood supply flowing through it
A . basal
B. hypoxic
C. connective
D. vascular ​

Answers

Answer:

c. connective tissue

Explanation:

The largest blood vessels are arteries and veins, which have a thick, tough wall of connective tissue and and many layers of smooth muscle cells

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HELPPPPPPPPP

Put the following processes of protein synthesis in the correct order.


1.DNA strands unwind and separate


2.mRNA copies DNA according to complimentary base pairing.


3.mRNA leaves the nucleus


4.tRNA's anticodons bring amino acids to the corresponding mRNA codons


5.amino acids bind to each other making a protein


6.a stop codon is reached, the newly formed protein is released to go do its job for the cell

Answers

Answer:

1. DNA strands unwind and separate 2.mRNA leaves the nucleus 3.mRNA copies DNA according to complimentary base paring .4 tRNA anticodons bring amino acids to the corresponding mRNA codons. 5 amino acids bind to each other making a protein 6. a stop codon is reached, the newly formed protein is released to go do its job for the cell

Just a quick summary will do!:

A. Sickle Cell Anemia is caused by a base change in DNA. Describe how the base change results in a faulty protein being made.

B. Briefly explain the inheritance pattern of the condition.

Answers

Answer: a) The single base change mutation occurs at the beta chain of haemoglobin when glutamic acid is replaced with valine.

b) Sickle Cell Anemia is inherited in an autosomal recessive pattern.

Explanation:

Haemoglobin is a protein found in the red blood cells whose main function is to transport oxygen. Sickle Cell Anemia is a disorder caused by a base change in DNA beta chain of haemoglobin. The amino acid valine is substituted for glutamic acid at one point in each of the two beta chains. When this type of hemoglobin is exposed to low oxygen, it forms elongated crystals inside the red blood cells that are sometimes 15 micrometers in length. These make it almost impossible for the cell to pass through many small capillaries, and the spiked ends of the crystals are likely to rupture the cell membrane, leading to sickle cell anemia.

In describing the inheritance patterns of sickle cell anaemia, it is of autosomal recessive pattern. This means that the parent of the affected individual both carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition. The gene for normal red blood cell is dominant over the gene for abnormal red blood cell which is said to be recessive. A person who is a stickler should have the genotype SS.

Which statement about green plants is true?
a. Most green plants do not need food.
b. Most green plants take in food though their roots.
c. Most green plants take in food through their leaves.

Answers

Answer:

answer is C and also DO NOT COPY OR PRESS THE LINK THE OTHER PERSON SENDED YOU ITS A HACK THEY WILL GET YOUR IP IF YOU PRESS THE LINK

Explanation:

does anyone know these two answers?

Answers

1. C 2. D ....... :)

When would a female have a 100% chance of inheriting a sex-linked recessive trait?
A. She inherits an affected X chromosome, but only from her mother.
B. Mother and father both pass on dominant alleles on somatic (body) chromosomes.
o
C. She inherits an affected X chromosome from both mother and father.
D. Mother and father both pass on recessive alleles on somatic (body) chromosomes.

Answers

Answer:

C. She inherits an affected X chromosome from both mother and father.

What letters represent the four nitrogen bases in DNA?

Answers

Answer:

The four nitrogen bases found in DNA are adenine, cytosine, guanine, and thymine. Each of these bases are often abbreviated a single letter: A (adenine), C (cytosine), G (guanine), T (thymine).

Explanation:

The four nitrogen bases found in DNA are adenine, cytosine, guanine, and thymine. Each of these bases are often abbreviated a single letter: A (adenine), C (cytosine), G (guanine), T (thymine).

What is base-pairing rule?

According to the base-pairing rule, the one purine binds with a specific pyrimidine always, the purine adenine (A) only pairs with the pyrimidine thymine (T)  and similarly, the purine guanine (G) only pairs with the pyrimidine cytosine (C) in DNA, and in RNA the purine adenine (A) binds with the only uracil.

The bases are Adenine, guanine, guanine, cytosine, thymine,  adenine the string of their base pair would be Thymine, cytosine, cytosine, guanine, adenine, thymine.

DNA stands for Deoxyribonucleic acid. It is made up of two complementary strands. There are four nitrogenous base present in the DNA strand. These are-

Adenine (A), thymine (T), guanine (G), and cytosine (C). These bases pair with bases on the complemenatry strand just according to the  Watson and Crick base pairing ( A=T, G ≡ C ). Uracil is another nitrogenous base. But it is present in RNA in place of Thymine.

Thus, bases found in the DNA are Adenine, thymine, guanine, cytosine.

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what caused a decrease of carbon dioxide in the biodomes air

Answers

Answer:

As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.

There are several possible reasons why the carbon dioxide levels in the air of a biodome might decrease like photosynthesis, respiration, ventilation and carbon sequestration.

What are the factors responsible for decrease of carbon dioxide in the biodomes air?

There are several possible reasons why the carbon dioxide levels in the air of a biodome might decrease. Some possible causes include:

Photosynthesis: If the biodome contains plants, they may be using carbon dioxide during photosynthesis to produce oxygen and glucose. This process would remove carbon dioxide from the air.

Respiration: If the biodome contains animals or microorganisms that respire, they may be consuming oxygen and producing carbon dioxide. This would result in a decrease in carbon dioxide levels in the air.

Ventilation: If the biodome has a ventilation system, it may be designed to remove excess carbon dioxide from the air. This could result in a decrease in carbon dioxide levels.

Carbon sequestration: If the biodome has systems in place to capture and store carbon dioxide, such as through the use of plants or other methods, this could result in a decrease in carbon dioxide levels in the air.

It's important to note that the specific cause of a decrease in carbon dioxide levels in the biodome's air will depend on the specific conditions and systems in place within the biodome.

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Can someone help me please

Answers

Answer is 4
There are 4 daughter cells that form from the parent cells, all carrying half of the parent cells chromosomes.
Hope this helps

Due to
certain traits do not demonstrate independent
assortment.
a Linkage
b Crossing-over
C Mutation
d None of the above
Check

Answers

Answer: linkage

Explanation: cK-12 says it’s right :)

A mother who has type A blood and father with type B blood have a child with type blood. They believe that the hospital has made a mistake and given them the wrong baby.

Answers

Answer:

So

Explanation:

What is the question here

When an animal moves, which energy transformation takes place?
A. food energy → moving energy
B.chemical energy → solar energy
C. chemical energy → potential energy
D.chemical energy mechanical energy ​

Answers

Explanation:

option D is the correct answer ..

hope this will be helpful to you .

plz mark my answer as brainlist if you find it useful

which type of mountain forms because of an oceanic plate and a continental plate colliding?
a. Aleutian
b. Continental-continental
c. Fault-block
d. Andean

Answers

Answer:

D.) Andean

Explanation:

Andean is the kind of mountain formed due to an oceanic plate and continental plate colliding.

Answer:

your answer to this question is Andean letter D

Explanation:

The holds the DNA, and controls the functions of eukaryotic cells.
Nuclear Membrane
Nucleus
Mitochondria
Chloroplast

Answers

Nucleus holds the DNA and controls the function of eukaryotic cells

Can a male be a carrier for colorblindness?

Answers

Explanation:

yes

X chromosome from his mother

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