NAGE 1

Question 1

What 3 things make up a nucleotide?

Answer 1

1. Nitrogenous base
2. Sugar molecule
3. 1/more phosphate groups

Question 2

What are pyrimidines?

Answer 2

Benzene rings with nitrogen substituted for C in positions 1 and 3.

Question 3

What are purines?

Answer 3

Pyrimidines with imidazole rings attached.

Question 4

Which C is linked to the base?

Answer 4

1’ C

Question 5

Which C is linked to the phosphate?

Answer 5

3’ C

Question 6

Which are the 2 purines?

Answer 6

Adenine and Guanine

Question 7

Which are the 3 pyrimidines?

Answer 7

Cytosine, Thymine, Uracil

Question 8

Difference between Thymine and Uracil.

Answer 8

No methyl group in uracil.

Question 9

What is a nucleoside?

Answer 9

Bases + Sugar.

Question 10

What is a nucleotide?

Answer 10

Base bound to sugar-phosphate complex.

Question 11

How is the primary structure of a nucleic acid determined?

Answer 11

Base sequence read from 5’ to 3’ end

First nucleotide has free 5’ phosphate

Last nucleotide has free 3’.

Question 12

The bases are ……… to the helix.

Answer 12

Perpendicular

Question 13

When are chromosomes visible?

Answer 13

Just before cells divide

Mitotic chromosomes are supercondensed

Question 14

When is chromatin more extended?

Answer 14

During interphase, when cell division isn’t occurring.

Question 15

What is the nucleosome?

Answer 15

DNA wrapped around histone proteins.