Multiple Choice Questions and Answers on RNA Structure
Question 1 : Which of the following is the smallest of the RNAs?
- Messenger RNA
- Transfer RNAs
- Ribosomal RNAs
- All of these
Answer : 2
Question 2 : The mRNA from which of the following would contain a poly-A tail?
- A restriction endonuclease from E. coli
- Bacterial alpha-amylase
- Human insulin
- Bacteriophage DNA ligase
Answer : 3
Question 3 : What is the average size (in bp) of a mature t-RNA?
- 80 bp
- 100 bp
- 120 bp
- 140 bp
Answer : 1
Question 4 : What modified base is at the 5′ extremity of a capped eukaryotic m-RNA?
- 1-methyl-guanosine
- 1-methyl-adenosine
- 2′-O-methyl-guanosine
- 7-methyl-guanosine
Answer : 4
Question 5 : What is the function of messenger RNA?
- It carries amino acids
- It is a component of the ribosomes
- It is a direct copy of a gene
- It is the genetic material of some organisms
Answer : 3
Question 6 : Retroviruses replicate via __________ intermediate
- RNA
- DNA
- mRNA
- rDNA
Answer : 2
Question 7 : During RNA synthesis, the DNA template sequence 5’Tp Ap Gp Cp 3′ Would be transcribed to produce which of the following RNA sequence?
- 5′-Ap Tp Cp Gp-3′
- 5′-Gp Cp Up Ap-3′
- 5′-Gp Cp Tp Ap-3′
- 5′-Ap Up Cp Gp-3′
Answer : 2
Question 8 : RNA instability in alkaline solutions is due to
- adenine
- ribose
- uracil
- single strand nature
Answer : 2
Question 9 : In RNA, uracil pairs with
- adenine
- cytosine
- thymine
- guanine
Answer : 1
Question 10 : Two features of the tRNA molecule associated, in converting the triplet codon to an amino acid, are
- in the T Loop and D stem and loop
- in the anticodon loop and D stem loop
- in the anticodon loop and the 3′ CCA end
- none of the above
Answer : 3
Question 11 : A nicked RNA molecule can be ligated by
- T4 RNA ligase
- DNA polymerase
- T4 DNA ligase
- all of these
Answer : 3
Question 12 : The tertiary structure of yeast tRNA
- involves extensive base stacking interactions
- resembles the 3-dimensional structure of other tRNAs
- is maintained mostly by non-Watson-Crick base pairing
- all of the above
Answer : 4
Question 13 : Which of following RNA characteristically contains unusual purines and pyrimidmes?
- rRNA
- nRNA
- mRNA
- tRNA
Answer : 4
Qestion 14 : The anticodon is a structure on
- rRNA
- aribosome
- mRNA
- tRNA
Answer : 2
Question 15 : The genetic material of retroviruses such as HIV is
- DNA
- RNA
- protein
- all of these
Answer : 2