Molecular Biology Mock Test 7

10%

Question 1 of 10

1. The activity of which of the following proteins is not regulated by covalent modifications?

Cell signaling

Digestive enzymes

Blood clotting

Apoptosis

Question 1 of 10

Question 2 of 10

2. Eukaryotic mRNA generally codes for a single protein because the eukaryotic translation includes ____________

Polycistronic codons

Starts at the first triplet codon

A single ORF

Monocistronic codons

Question 2 of 10

Question 3 of 10

3. Prenylation adds prenyl groups to the ___________ amino acid residues.

Arginine

Cystine

Threonine

Methionine

Question 3 of 10

Question 4 of 10

4. Which of the following is false about bacterial tryptophan operon?

The co-repressor is the catabolite activator protein

It has two kinds of regulation system

The complex of repressor with co-repressor on binding to the operator blocks transcription

When tryptophan supply is insufficient the tryptophan operon activates

Question 4 of 10

Question 5 of 10

5. Which of the following is not a target site for repressor molecules?

Promoter sites

Activators

Co-repressors

Mediators

Question 5 of 10

Question 6 of 10

6. In case of transcription which is the rate limiting step?

Unwinding of DNA duplex

Formation of the open complex

Promoter escape

Binding of RNA polymerase

Question 6 of 10

Question 7 of 10

7. Ubiquitin binds to the ___________ amino acid residue for degradation.

Serine

Proline

Valine

Lysine

Question 7 of 10

Question 8 of 10

8. Which of the following eukaryotic proteins is an analog of IF2-GTP?

eIF2-GTP

eIF2B-GTP

eIF5B-GTP

eIF4G

Question 8 of 10

Question 9 of 10

9. How many enzymes are produced in the lac operon under the same promoter?

Question 9 of 10

Question 10 of 10

10. Aminoacyl tRNA needs an escort to carry them to the ribosome bound mRNA.

False

True

Question 10 of 10