3.1.5.1 DNA

Question 1

What is the role of DNA and RNA?

Answer 1

DNA - holds genetic information in all living organism.
RNA - Transfers genetic information from DNA to ribosomes

Question 2

What are DNA molecules called?

Answer 2

Polynucleotides

Question 3

What are the components of DNA and RNA?

Answer 3

Phosphate group, nitrogenous base, ribose sugar

Question 4

What are the base pairings for DNA and RNA?

Answer 4

DNA - A-T C-G
RNA - A-U C-G

Question 5

How are polynucleotides joined together?

Answer 5

Condensation reaction

Question 6

What are the bonds that join nucleotides together?

Answer 6

Phosphodiester bonds

Question 7

What is the chain of sugars and phosphates called?

Answer 7

Sugar-phosphate backbone

Question 8

How are polynucletides joined together?

Answer 8

Hydrogen bonds between complementary base pairs.

Question 9

What direction do DNA strands move?

Answer 9

• Anti parallel direction

Question 10

How does the structure of DNA link to its function?

Answer 10

1) Weak hydrogen bonds between DNA polynucleotides which can separate easily during DNA replication.
2) DNA is a very large molecule, so can carry lots of genetic information.