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DNA structure

Last updated almost 6 years ago

9 questions

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Question 1

1.

The shape of DNA is described as.

double helix.

triple helix.

Question 2

2.

Components of a nucleotide. Check all that apply.

phophate group

1 of 4 nitrogenous bases

Question 3

3.

Question 4

4.

Question 5

5.

The backbone of DNA is made up of...

alternating deoxyribose and phosphates.

deoxyribose only.

phosphates only.

nitrogenous bases.

Question 6

6.

The "rungs" of the twisted ladder is made up of...

phosphates.

deoxyribose.

paired nitrogenous bases.

purines.

Question 7

7.

The base pairing rules state that...(Check all that apply)

Guanine and cytosine are base pairs.

Thymine and cytosine are pyrimidine.

Adenine and guanine are purines.

Adenine and thymine are base pairs.

Question 8

8.

In a sample of DNA the percentage of adenine equals 31.5%. Therefore,

guanine is also equal of 31.5%.

cytosine is also equal of 31.5%.

thymine is also equal of 31.5%.

Question 9

9.

Using the base-pairing rules, what would be the complementary strand to ACGGT?

ACGGT

TGCCA

TGGCA

ACCGT

deoxyribose sugar

ribose sugar

adenine only

Purines. Check all that apply.

guanine

thymine

adenine

cytosine

double ring structure

single ring structure

Pyrimidines: Check all that apply.

guanine

thymine

adenine

cytosine

double ring structure

single ring structure