Chapter 8: DNA Structure and Function

Question 1

DNA is a polymer of nucleotides, each with a ____-carbon sugar, ___ phosphate groups, and ___ of four nitrogen-containing bases.

Answer 1

• five
• three
• one

Question 2

The four nucleotides in DNA are:

Answer 2

1. Adenine (A)
2. Guanine (G)
3. Thymine (T)
4. Cytosine (C)

Question 3

What is Chargaff’s First Rule?

What is Chargaff’s Second Rule?

Answer 3

1. A = T and G = C

2. The proportions of Adenine and Guanine differ among the DNA of different species.

Question 4

The (3’/5’) carbon of each sugar of each nucleotide is joined by a phosphate group to the (3’/5’) carbon of the next sugar, forming the backbone of each chain (or strand) running in opposite directions.

Answer 4

• 3’

- 5’

Question 5

________ bonds between the internally positioned bases hold the two strands of DNA together.

Answer 5

Hydrogen