Online MDcat Test Preparation Series Quiz-10

101. The amino acid coded by 3 codons is

1. Proline
2. Tryptophan
3. Isoleucine
4. Serine

 

102. The anticodon of initiation codon for protein synthesis is

1. UUU
2. UAC
3. AUG
4. CAU

 

103. The energy source for the elongation process is

1. Creatine-PO₄
2. GTP
3. ATP
4. All of the above

Feedback: Guanosine triphosphate (GTP), which is a purine nucleotide triphosphate, acts as an energy source during translation—both at the start of elongation and during the ribosome’s translocation.

 

104. Which step does not occur in translation?

1. Replication
2. Elongation
3. Termination
4. Initiation

 

105. The proofreading enzyme in DNA replication is

1. Primase
2. Ligase
3. DNA Polymerase I
4. DNA Polymerase II

 

106. Non-sense codons participate in

1. Terminating message of gene-controlled protein synthesis
2. Releasing t-RNA from polynucleotide chain
3. Formation of unspecified amino acids
4. Conversion of sense DNA into non-sense DNA

 

107. The enzyme involved in transcription

1. DNA Polymerase I
2. RNA Polymerase
3. DNA Polymerase III
4. DNA Polymerase II

 

108. Select a ribozyme

1. Peptidyl transferase
2. Ribonuclease-P
3. Helicase
4. Both (a) and (b)

 

109. In lac-operon, which protein is not regulated by the repressor?

1. Galactosidase
2. Tryptophan
3. Lactose Permease
4. Transacetylase

 

110. The eukaryotic replication of DNA is

1. Unidirectional with a single origin
2. Bidirectional with a single origin
3. Unidirectional with many origins
4. Bidirectional with many origins

 

111. AUG stands for

1. Alanine
2. N-formyl methionine
3. Methionine
4. Glycine

 

 112. The primer in DNA replication is

1. Small deoxyribonucleotide polymer
2. Helix destabilizing protein
3. Enzyme joining nucleotides of new strands
4. Small Ribonucleotide Polymer

 

113. Genetic information is transferred from nucleus to cytoplasm through

1. DNA
2. RNA
3. Anticodon
4. Lysosomes

 

114. Which enzyme is not produced during lactose catabolism by E.coli?

1. ?-galactosidase
2. Lactose Permease
3. Thiogalactoside transacetylase
4. Lactose dehydrogenase

 

115. Spliceosomes are absent in the cells of

1. Bacteria
2. Animals
3. Fungi
4. Plants