DNA Structure Practice

DNA is a nucleic _____.

Answer explanation

Nucleic acids are one of the 4 main biological molecules we've learned about this year.

The other 3 categories are carbohydrates, lipids, and proteins.

The backbone of the DNA ladder is made of what two things?

• deoxyribose sugars and phosphate groups

• nitrogen bases and hydrogen bonds

• phosphate groups and nitrogen bases

The steps, or rungs, of a DNA ladder are formed from nitrogen bases joined together by which?

• peptide bonds

• hydrogen bonds

• phosphodiester bonds

Adenine, Thymine, Cytosine, and Guanine are what?

• nitrogen bases

• amino acids

• hydrogen bonds

• sugars

in DNA, the nitrogen base adenine pairs with which?

• thymine

• cytosine

• guaning

• uracil

Answer explanation

A-T

C-G

in DNA, the nitrogen base cytosine pairs with which?

• thymine

• adenine

• guanine

• uracil

Answer explanation

A-T

C-G

If a template strand of DNA reads AAA, type in its complementary strand sequence.

Answer explanation

Remember that Adenine on one side of DNA pairs with Thymine on the other side, and vice versa.

So, A and T are complementary...

If a template strand of DNA reads CCC, type in its complementary strand sequence.

Answer explanation

Remember that Cytosine on one side of DNA pairs with Guanine on the other side, and vice versa.

So, C and G are complementary...

If a template strand of DNA reads AATT, type in its complementary strand sequence.

If a template strand of DNA reads CTAAG, type in its complementary strand sequence.