RNA Structure Questions and Answers

Multiple Choice Questions and Answers on RNA Structure

Question 1 : Which of the following is the smallest of the RNAs?

  1. Messenger RNA
  2. Transfer RNAs
  3. Ribosomal RNAs
  4. All of these

Answer : 2

Question 2 : The mRNA from which of the following would contain a poly-A tail?

  1. A restriction endonuclease from E. coli
  2. Bacterial alpha-amylase
  3. Human insulin
  4. Bacteriophage DNA ligase

Answer : 3

Question 3 : What is the average size (in bp) of a mature t-RNA?

  1. 80 bp
  2. 100 bp
  3. 120 bp
  4. 140 bp

Answer : 1

Question 4 : What modified base is at the 5′ extremity of a capped eukaryotic m-RNA?

  1. 1-methyl-guanosine
  2. 1-methyl-adenosine
  3. 2′-O-methyl-guanosine
  4. 7-methyl-guanosine

Answer : 4

Question 5 : What is the function of messenger RNA?

  1. It carries amino acids
  2. It is a component of the ribosomes
  3. It is a direct copy of a gene
  4. It is the genetic material of some organisms

Answer : 3

Question 6 : Retroviruses replicate via __________ intermediate

  1. RNA
  2. DNA
  3. mRNA
  4. 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?

  1. 5′-Ap Tp Cp Gp-3′
  2. 5′-Gp Cp Up Ap-3′
  3. 5′-Gp Cp Tp Ap-3′
  4. 5′-Ap Up Cp Gp-3′

Answer : 2

Question 8 : RNA instability in alkaline solutions is due to

  1. adenine
  2. ribose
  3. uracil
  4. single strand nature

Answer : 2

Question 9 : In RNA, uracil pairs with

  1. adenine
  2. cytosine
  3. thymine
  4. guanine

Answer : 1

Question 10 : Two features of the tRNA molecule associated, in converting the triplet codon to an amino acid, are

  1. in the T Loop and D stem and loop
  2. in the anticodon loop and D stem loop
  3. in the anticodon loop and the 3′ CCA end
  4. none of the above

Answer : 3

Question 11 : A nicked RNA molecule can be ligated by

  1. T4 RNA ligase
  2. DNA polymerase
  3. T4 DNA ligase
  4. all of these

Answer : 3

Question 12 : The tertiary structure of yeast tRNA

  1. involves extensive base stacking interactions
  2. resembles the 3-dimensional structure of other tRNAs
  3. is maintained mostly by non-Watson-Crick base pairing
  4. all of the above

Answer : 4

Question 13 : Which of following RNA characteristically contains unusual purines and pyrimidmes?

  1. rRNA
  2. nRNA
  3. mRNA
  4. tRNA

Answer : 4

Qestion 14 : The anticodon is a structure on

  1. rRNA
  2. aribosome
  3. mRNA
  4. tRNA

Answer : 2

Question 15 : The genetic material of retroviruses such as HIV is

  1. DNA
  2. RNA
  3. protein
  4. all of these

Answer : 2