Match each item in Column I with one item in Column II and chose your answer from the codes given below:

    Column I                   Column II
  (antibiotic)                    (effect)
I. Tetracycline            1. inhibits binding of aminoacyl tRNA to the ribosome
II. Streptomycin        2. inhibits initiation of translation
III. Chloramphenicol  3. inhibits peptidyl transferase
IV. Erythromycin       4. inhibits translocation of mRNA along with ribosome

Codes:

1. 1 2 3 4

2. 2 1 4 3

3. 2 1 3 4

4. 1 2 4 3

Which one of the following pairs of codons are correctly matched with their function or the signal for the particular amino acid?

1. GUU, GCU – Alanine

2. UAG, UGA – Stop

3. AUG, ACG – Start/methionine

4. UUA, UCA – Leucine

Formation of peptide bond is

1. active process

2. passive process

3. both active and passive process

4. neither active nor passive process

The UTR [untranslated regions] in an mRNA:

Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?

1. Repair of DNA

2. Electron transport chain

3. Formation of peptide bond

4. Organization of MTOC during cell division

Which of the following anticodons will hybridize with the mRNA codon 5’ – AUG – 3’?

Polypeptides are

1. dictated by DNA

2. represented by mRNA

3. Expresssion of t-RNA

4. Both 1 and 2

Choose the correct statements –
I. Binding of mRNA to the ribosome is loose and reversible.
II. The ribosome, which is composed of tRNA and proteins, consists of a small and large subunit.
III. Each of the 20 amino acids has a minimum of one specific tRNA molecule.
IV. tRNA^MET binds to the first codon (AUG) – this is called the START codon.
V. The second tRNA binds to the second codon so that their attached monosaccharides are next to each other.
VI. The newly formed polypeptide may undergo post-transcriptional modification.

1. I, III and IV
2. II, IV, VI
3. II, V and VI
4. I, V, VI.