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Biology OCR (3, biological molecules) > Nucleic acids > Flashcards

Flashcards in Nucleic acids Deck (37)
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1

What is the monomer of a nucleic acid?

A nucleotide

2

What are the two types of nucleic acid?

DNA and RNA

3

What elements do nucleic acids contain?

Carbon, hydrogen, oxygen, nitrogen and phosphorus.

4

What are the three components of a nucleotide?

1. A pentose monosaccharide 2. A phosphate group 3. A nitrogenous base

5

What is the phosphate group used in nucleotides?

-PO2-,4

6

Draw the structure of a sugar-phosphate backbone

7

Draw the structure of a nucleotide

e

8

What is the name of the nucleotide polymer?

polynucleotide

9

How are nucleotides linked together to form polymers/

By condensation reactions

10

What is the name of the bond formed between two nucleotides?

Phosphodiester bonds

11

What parts of the nucleotide undergo the condensation reaction?

The phosphate group on one nucleotide and the hydroxyl group n another nucleotide.

12

Which carbon on the pentose sugar is the phosphate group attached to?

5th

13

Which carbons on the pentose sugar are the hydroxyl groups attached to?

2nd and 3rd

14

Which hydroxyl group undergoes the condensation reaction?

The 3rd

15

What type of bond is formed during the condensation reaction?

Covalent

16

What is another name for a polynucleotides?

Sugar-phosphate backbone.

17

What are the phosphdiester bonds broken by?

Hydrolysis

18

What does DNA stand for?

Deoxyribonucleic acid

19

Draw the structure of deoxyribose

e

20

Draw the structure of ribose

e

21

What are the 4 bases of DNA?

T,A,C,G

22

Which out of the 4 bases is a pyrimidines?

T and C

23

Which out of the 4 bases is a purines?

A and G

24

Describe the structure of pyrimides

Smaller with a single carbon ring structure

25

Describe the structure of purines

Larger with a double carbon ring structure

26

What does base A stand for?

Adenine

27

What does base T stand for?

Thymine

28

What does base C stand for?

Cytosine

29

What does base G stand for?

Guanine

30

How are the two strands f the DNA double helix held together?

By hydrogen bonds between the two bases