Chapters 8.1- 8.2

Question 1

DNA structure is the same in….

Answer 1

All organisms.

Question 2

How many types of nucleotides is DNA composed of?

Answer 2

4

Question 3

DNA is made up of a long chain of nucleotides, each nucleotide has 3 parts. What are those three parts?

Answer 3

a phosphate group
a deoxyribose sugar
a nitrogen containing base

Question 4

What is the only difference in the four nucleotides?

Answer 4

The nitrogen containing bases.

Question 5

What are the 4 nucleotides?

Answer 5

Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)

Question 6

Describe whether Pyrimidine and Purine is single ringed or double ringed and name the nucleotides that go with each.

Answer 6

Pyrimidine- single ringed
Thymine (T)
Cytosine (C)

Purines- double ringed
Adenine (A)
Guanine (G)

Question 7

What are the base pairing rules for DNA?

Answer 7

• A pairs with T

* C pairs with G

Question 8

Why does the helix have a uniformed width?

Answer 8

Because a pyrimidine pairs with a purine.

Question 9

What is the sugar phosphate backbone connected by?

Answer 9

Covalent Bonds.

Question 10

What are the bases connected by?

Answer 10

Hydrogen Bonds

Question 11

What are the base pairs and how many hydrogen bonds connect them?

Answer 11

A-T (two hydrogen bonds)

G-C (three hydrogen bonds)

Question 12

How was DNA identified as the genetic material?

Answer 12

Through a series of experiments.