Explore topic-wise MCQs in Biochemistry.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Two features of the tRNA molecule associated, in converting the triplet codon to an amino acid, are
A. in the T Loop and D stem and loop
B. in the anticodon loop and D stem loop
C. in the anticodon loop and the 3' CCA end
D. none of the above
Answer» D. none of the above
Discussion
2.

Which of the following is the smallest of the RNAs?
A. Messenger RNA
B. Transfer RNAs
C. Ribosomal RNAs
D. All of these
Answer» C. Ribosomal RNAs
Discussion
3.

The mRNA from which of the following would contain a poly-A tail?
A. A restriction endonuclease from
B. <i>E. coli</i>
C. Bacterial alpha-amylase
D. Human insulin
E. Bacteriophage DNA ligase
Answer» D. Human insulin
Discussion
4.

What is the average size (in bp) of a mature t-RNA?
A. 80 bp
B. 100 bp
C. 120 bp
D. 140 bp
Answer» B. 100 bp
Discussion
5.

RNA instability in alkaline solutions is due to
A. adenine
B. ribose
C. uracil
D. single strand nature
Answer» C. uracil
Discussion
6.

What modified base is at the 5' extremity of a capped eukaryotic m-RNA?
A. 1-methyl-adenosine
B. 2'-O-methyl-guanosine
C. 7-methyl-guanosine
D. 1-methyl-guanosine
Answer» D. 1-methyl-guanosine
Discussion
7.

What is the function of messenger RNA?
A. It carries amino acids
B. It is a component of the ribosomes
C. It is a direct copy of a gene
D. It is the genetic material of some organisms
Answer» D. It is the genetic material of some organisms
Discussion
8.

During RNA synthesis, the DNA template sequence 5'Tp Ap Gp Cp 3' Would be transcribed to produce which of the following RNA sequence?
A. 5'-Ap Tp Cp Gp-3'
B. 5'-Gp Cp Up Ap-3'
C. 5'-Gp Cp Tp Ap-3'
D. 5'-Ap Up Cp Gp-3'
Answer» C. 5'-Gp Cp Tp Ap-3'
Discussion
9.

Retroviruses replicate via __________ intermediate
A. RNA
B. DNA
C. mRNA
D. rDNA
Answer» C. mRNA
Discussion
10.

The genetic material of retroviruses such as HIV is
A. DNA
B. RNA
C. protein
D. all of these
Answer» C. protein
Discussion
11.

The tertiary structure of yeast tRNA
A. involves extensive base stacking interactions
B. resembles the 3-dimensional structure of other tRNAs
C. is maintained mostly by non-Watson-Crick base pairing
D. all of the above
Answer» E.
Discussion
12.

A nicked RNA molecule can be ligated by
A. T4 RNA ligase
B. DNA polymerase
C. T4 DNA ligase
D. all of these
Answer» D. all of these
Discussion
13.

Which of following RNA characteristically contains unusual purines and pyrimidmes?
A. rRNA
B. nRNA
C. mRNA
D. tRNA
Answer» E.
Discussion
14.

The anticodon is a structure on
A. mRNA.
B. tRNA.
C. aribosome.
D. rRNA.
Answer» C. aribosome.
Discussion
15.

In RNA, uracil pairs with
A. adenine
B. cytosine
C. thymine
D. guanine
Answer» B. cytosine
Discussion