DNA

Question 1

Define heterochromatin

Answer 1

DNA in the solenoid arrangement (tightly packed). DNA not accessible, genes not expressed.

Question 2

Define euchromatin

Answer 2

Loosely packed DNA in beads on a string arrangement. DNA more accessible for transcription, more active gene expression.

Question 3

What is the limit of resolution?

Answer 3

The minimum distance at which two objects can be distinguished.

Question 4

Which bases are purines?

Answer 4

Adenine and guanine

Question 5

What is the genome?

Answer 5

Entire DNA sequence - consists of 24 chromosomes (22 + X and Y).

Question 6

What’s the difference between nucleotides and nucleosides?

Answer 6

Nucleotide = phosphate, sugar and base

Nucleoside = sugar and base.

Question 7

How many hydrogen bonds form between A and T?

Answer 7

2

Question 8

What’s the difference between purines and pyrimidines?

Answer 8

Purines have 2 rings and pyrimidines have 1 ring

Question 9

What’s the difference between deoxyribose and ribose?

Answer 9

Ribose has an OH group on its 2’ carbon, deoxyribose has just a H.

Question 10

What is chromatin?

Answer 10

Double started DNA wrapped around proteins called histones