nucleic acids

Question 1

name the three parts of a nucleotide

Answer 1

phosphate group
pentose sugar
nitrogen containing base

Question 2

pentose sugars in DNA or RNA

Answer 2

deoxyribose

ribose

Question 3

role of DNA in living cells

Answer 3

base sequence of genes codes for functional RNA + amino acid sequence of polypeptides

determined inherited characteristics

Question 4

role of rRNA in living cells

Answer 4

component of ribosomes along with proteins

Question 5

role of tRNA in living cells

Answer 5

supplies complementary amino acid to mRNA codons during translation

Question 6

role of mRNA in living cells

Answer 6

complementary sequence to one gene from DNA with introns spliced out

can be translated into a polypeptide by ribosomes

Question 7

how do polynucleotides form?

Answer 7

condensation reactions between nucleotides form strong PHOSPHODIESTER BONDS

(sugar-phosphate backbone)

Question 8

structure of DNA

Answer 8

double helix

H bonds between complementary purine and pyrimidine base pairs on opposite strands

Question 9

which bases are purine and which are pyrimidine?

Answer 9

A + G 2 ring purine bases

T + C + U 1 ring pyrimidine bases

Question 10

complementary base pairs in DNA

Answer 10

two H bonds A and T

three H bonds G and C