Does the DNA in the skin cell have the same backbone as DNA in the brain cell of

Question

Does the DNA in the skin cell have the same backbone as DNA in the brain cell of the same organism?

No, the backbones will be different because of mutations.

No, the backbones will be different in each cell type.

Yes, the backbones of DNA are different for each person, but within the organism – they are the same in all cells.

Yes, all backbones of ALL DNA molecules are the same.

Question 2

Select one answer.

10 points

This is an image of

Deoxyribose pyrimidines

Deoxyribose purine

Ribose pyrimidine

Ribose purine

Question 3

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10 points

Which labeled region is the base?

Red

Green

Blue

Question 4

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10 points

Which of these is NOT a difference between DNA and RNA?

DNA tends to be double stranded, while RNA tends to be single stranded

RNA uses the base thymine while DNA uses the base uracil.

DNA uses the sugar deoxyribose while RNA uses the sugar ribose.

All of these are differences between DNA and RNA.

Question 5

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10 points

Which nucleotide is at the 3’ end of this nucleic acid?

C

G

T

A

Question 6

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10 points

How many phosphate groups does ATP have?

1

2

3

4

Question 7

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10 points

What type of molecule is shown here:

Carbohydrate

Lipid

Nucleotide

Amino acid

Question 8

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10 points

Which of the following forms branched polymers:

Proteins

Carbohydrates

Lipids

DNA

Question 9

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10 points

The molecule shown here is: _________________

an amino acid

a nucleotide

a lipid

a carbohydrate

Question 10

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10 points

Which of the following is used for long term energy storage?

Carbohydrates

Nucleic Acids

Lipids

Proteins

Explanation / Answer

1. b) Yes. All the backbones of all DNA molecules are the same. (in terms of composition)

The back bone consists of alternating ribose sugar and phosphate (phosphodiester), which is same for all the DNA molecules, irrespective of its sequence of the nucleotides. The bases protrude away from the back bone, and they only differ in the DNA.

2. Ribose purine. The second C of ribose has -OH group, and hence is a ribose (deoxyribose has -H group at this position, instead of -OH group). The base is a 9 N ring structure, and hence is a purine. Hence, it is a Ribose purine.

3. Green. The region has guanine base.

4. RNA uses the base thymine while DNA uses the base uracil.

The option is not correct as RNA uses Uracil, whereas DNA uses thymine.

5. Thymine. The 3' end is the end where a free -OH group is present. A thymine nucleotide is present at the 3'end in the given molecule.

6. Three, ATP means Adenosine tri phosphate, which indicates three phosphates.

7. Amino acid. The molecule has an amino group, an acid group, and a side chain R

8. Carbohydrates. The sugars have multiple -OH groups that can be esterified or ether linked to other molecules. Hence, they can form branched polymers.

9. an amino acid

10. Lipids. Lipids. Lipids exclude water molecules, hence more volume of fat can be stored in a defined area. The calorific value of lipids is almost twice as much as those of carbohydrates and proteins, and thus, release more energy.

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