#7: Nucleic Acids

Question 1

Function

Answer 1

Store heredity info and determine structural and functional characteristics of organisms

Question 2

Structure

Answer 2

Consists of nucleotides joined together in long strands

Two types: DNA and RNA

Nucleotides

Question 3

DNA

Answer 3

Double strand

Heredity of cell

Question 4

RNA

Answer 4

Single strand

Active in making proteins for cell

Act as messenger

Question 5

Nucleotides

Answer 5

Consists of phosphate group, sugar, nitrogenous base

Form from strands of DNA and RNA through condensation reaction

Hydroxyl from phosphate group and hydroxyl from sugar combine and give off water

Bond formed called PHOSPHODIESTER BOND

Question 6

Phosphate Group

Answer 6

PO4

Identical in DNA and RNA

Question 7

Sugar

Answer 7

Pentose

RNA- ribose
DNA- deoxyribose

Question 8

Nitrogenous Base

Answer 8

DNA:
Contains adenine, guanine, cytosine, thymine
Bonding- A and T, G and C

RNA:
Contains adenine, guanine, cytosine, uracil
Bonding- A and U, G and C

A & T/U form 2 H-Bonds
G & C form 3 H-Bonds

Question 9

DNA structure

Answer 9

Consists of two strands, which are held together by H-Bonds between nitrogenous bases

Two strands run opposite directions (antiparallel)

3’ denote sugar end
5’ denote phosphate end

One strand run 3’ to 5’ and other 5’ to 3’