polynucleotides

Question 1

what’s the basic structure of nucleotides

Answer 1

• at least 1 phosphate group
• a deoxyribose sugar
• a nitrogenous base

Question 2

how many bases are there

Answer 2

4

Question 3

4 bases are

Answer 3

A,C,G,T and U

Question 4

purine

Answer 4

AT (2 hydrogen bonds)

Question 5

pyrimidine

Answer 5

GC (3 hydrogen bonds)

Question 6

polynucleotide

Answer 6

when nucleotides bind together through condensation

Question 7

phosphodiester bond

Answer 7

Condensation reaction
2. (Between) phosphate and deoxyribose;
3. (Catalysed by) DNA polymerase;

Question 8

sugar phosphate backbone

Answer 8

the continuous structure of alternating phosphate and sugar molecules

Question 9

DNA is what type of molecule ?

Answer 9

double stranded , anti parallel molecule (they run in opposite directions)

Question 10

Describe the structure of DNA.

Answer 10

Polynucleotide;
2. Each nucleotide formed from deoxyribose sugar, a phosphate (group) and
a nitrogenous base;
3. Phosphodiester bonds
4. Double helix shape
5. Hydrogen bonds between adenine, thymine and
cytosine, guanine;