Question

1. the backbone (sides) of dna is made of:

a. sugars and phosphates

b. nitrogen bases only

c. amino acids

d. proteins

1. if a part of a dna molecule has the sequence c a t g g a, the complementary strand will be:

a. g t a c c t

b. c a t g g a

c. t a c g g t

d. g a t c c a

Explanation:

For question 4: The DNA double helix has a backbone composed of alternating deoxyribose sugar molecules and phosphate groups, while nitrogen bases form the rungs. Amino acids and proteins are not part of the DNA backbone.
For question 5: In DNA, complementary base pairing rules are: cytosine (C) pairs with guanine (G), and adenine (A) pairs with thymine (T). Matching each base in the given sequence follows these rules.

Answer:

1. a. Sugars and phosphates
2. a. GTACCT