2 JANUARY 2021 CURRENT AFFAIRS QUIZ

The growing polypeptide chain is released from the ribosomes when

a chain terminating tRNA binds to the ribosome

the 7-methyl guanosine cap is reached

the poly A tail is reached

a chain terminating codon is reached

TRUE ANSWER : ?
YOUR ANSWER : ?

Protein synthesis rates in prokaryotes are limited by the rate of mRNA synthesis. If RNA synthesis occurs at the rate of 50 nucleotides/sec, then rate of protein synthesis occurs at

10 amino acids/sec

50 amino acids/sec

17 amino acids/sec

25 amino acids/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

Degenerated codon differs mostly in

the identities of their third base

the identities of their second base

the wobble position

both (b) and (c)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a necessary component of translation?

Anticodon

mRNA

Amino acid

Ligase

TRUE ANSWER : ?
YOUR ANSWER : ?

The site of protein synthesis is

Chromosome

Ribosome

Endoplasmic reticulum

Nucleus

TRUE ANSWER : ?
YOUR ANSWER : ?

Type I proteins (plasma membrane) have a

multiple signal sequence and a hydrophobic stop transfer sequence

cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence

multiple signal sequence that doubles as the membrane anchoring sequence

cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence

TRUE ANSWER : ?
YOUR ANSWER : ?

Translation in prokaryotes begins by the formation of a 30S initiation complex between the

30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA

30S ribosomal subunit and mRNA only

30S ribosomal subunit, tRNA and initiation factors

30S ribosomal subunit, mRNA and initiation factors

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has unusual bases?

hnRNA

rRNA

tRNA

mRNA

TRUE ANSWER : ?
YOUR ANSWER : ?

The pathway of a tRNA during polypeptide elongation on the ribosome is

A site → P site → entry site

A site → P site → E site

P site → entry site → exit site

P site → A site → E site

TRUE ANSWER : ?
YOUR ANSWER : ?

Eukaryotic mRNA binding to the ribosomes is facilitated by __________ .

tRNA

the Shine Dalgarno sequence

the 7-methyl guanosine cap

poly A tail

TRUE ANSWER : ?
YOUR ANSWER : ?