BSC2010 Questions with Answers (100% Correct Answers)

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BSC2010 Questions with Answers (100%
Correct Answers)
Where does translation take place?

a) Endoplasmic reticulum

b) Ribosome

c) Golgi apparatus

d) Nucleus Answer: b) Ribosome

Which nucleic acid is translated to make a protein?

a) DNA

b) rRNA

c) tRNA

d) mRNA Answer: d) mRNA

Which of the following processes is an example of a post-translational
modification?

a) Initiation

b) Peptide bond formation

c) Phosphorylation

d) Elongation Answer: c) Phosphorylation

Which of the following steps occurs last in the initiation phase of translation?

a) The small subunit of the ribosome binds to the 5' cap on the mRNA.

b) The large ribosomal subunit joins the complex.

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c) An aminoacyl tRNA binds to the start codon.

d) A peptide bond is formed between two adjacent amino acids. Answer: b)
The large ribosomal subunit joins the complex.

At which site do new aminoacyl tRNAs enter the ribosome during elongation?

a) B-site

b) A-site

c) P-site

d) E-site Answer: b) A-site

What is meant by translocation?

a) The polypeptide chain grows by one amino acid.

b) The ribosome slides one codon down the mRNA.

c) The two ribosomal subunits are joined in a complex.

d) The completed polypeptide is released from the ribosome. Answer: b) The
ribosome slides one codon down the mRNA.

True or false. A tRNA with an anticodon complementary to the stop codon
catalyzes the reaction by which translation is terminated.

a) True

b) False Answer: b) False

What enzyme catalyzes the attachment of an amino acid to tRNA?

a) aminoacyl-tRNA synthetase

b) rubisco

c) dextrinase