Topic 2:3 DNA structure

Question 1

quickly state the function of DNA

Answer 1

DNA stores and transmits genetic information; it functions in the same way in all living things.

Question 2

DNA contains the instructions for…

Answer 2

constructing other components of a cell, such a proteins and RNA molecules

Question 3

describe the structure of DNA in eukaryotes

Answer 3

DNA molecules are wound tightly around globular proteins called histones, forming a DNA-protein mixture called chromatin.

Question 4

what are the four nitrogenous bases?

Answer 4

Adenine, Thymine, Guanine and Cytosine

Question 5

What are A, T, C and G

Answer 5

nitrogenous bases

Question 6

the bonding between the strands/nitrogenous bases is….

Answer 6

complementary. Adenine always pairs with Thymine, Cytosine always pairs with Guanine.

Question 7

the two strands are bonded together by…. (and why?)

Answer 7

weak hydrogen bonds. so they can separate and reform easily when DNA is replicated.

Question 8

what model describes the shape of DNA

Answer 8

double helix

Question 9

DNA has direction referred to as…

Answer 9

3’ prime and 5’ prime. Complementary strands run in opposite directions.

Question 10

chromatin is organised into structures called

Answer 10

chromosomes (linear)