Genetic Information - Block 2

Question 1

In what direction does right-handed 3’-5’ DNA turn?

Answer 1

Anti-clockwise.

Question 2

In what direction does left-handed 3’-5’ DNA turn?

Answer 2

Clockwise.

Question 3

What are the three pyrimidine bases?

Answer 3

Cytosine, Thymine & Uracil.

Question 4

What are the components of RNA?

Answer 4

> Phosphoric acid

> RNA bases

> Ribose sugar

Question 5

How is a singular nucleoside formed?

Answer 5

> The sugar OH and base H react to expel water and for a GLYCOSIDIC BOND.

Question 6

How is a singular nucleoSIDE formed?

Answer 6

The sugar OH and base H react to form a GLYCOSIDIC BOND (water is produced).

Question 7

How is a singular nucleoTIDE formed?

Answer 7

The sugar OH and phosphate H react to form a PHOSPHOESTER LINKAGE (water is produced).

Question 8

How is a singular nucleoTIDE formed? ***

Answer 8

The sugar OH and phosphate H react to form a PHOSPHOESTER LINKAGE (water is produced).

Question 9

How do components form a single strand of DNA?

Answer 9

> Nucleotides form phosphodiester linkages with each other in a repeating way.

> The opposite bases are joined by either two (A-T) or three (G-C) hydrogen bonds.