12th Grade > Biology
MOLECULAR BASIS OF INHERITANCE MCQs
Total Questions : 56
| Page 6 of 6 pages
Answer: Option B. -> Griffith
:
B
Transformation experiments in bacteria were first performed by Frederick Griffith in 1928. He performed the experiment to understand the nature of the hereditary material in cells.
:
B
Transformation experiments in bacteria were first performed by Frederick Griffith in 1928. He performed the experiment to understand the nature of the hereditary material in cells.
Answer: Option A. -> Inhibiting transcription of mRNA
:
A
Gene regulation can happen at various stages of protein synthesis. In the operon model, gene regulation happens at the transcriptional level, wherein the transcription of the respective gene and the production of mRNA is stopped by the regulator, as per requirement.
:
A
Gene regulation can happen at various stages of protein synthesis. In the operon model, gene regulation happens at the transcriptional level, wherein the transcription of the respective gene and the production of mRNA is stopped by the regulator, as per requirement.
Answer: Option D. -> Unpaired triplet of nitrogen bases at one end of tRNA
:
D
Anticodon is the unpaired triplet of N2bases at one end of tRNA. The anticodon is used in identifying the mRNA sequence that will decide the amino acid for the polypeptide.
:
D
Anticodon is the unpaired triplet of N2bases at one end of tRNA. The anticodon is used in identifying the mRNA sequence that will decide the amino acid for the polypeptide.
Answer: Option B. -> DNA polymerase reads in 3’-5’ direction and RNA polymerase reads in 3’-5’ direction
:
B
All polymerases read in 3’-5’ direction. This means that the templates which they copy from, run in the 3’-5’ direction.
:
B
All polymerases read in 3’-5’ direction. This means that the templates which they copy from, run in the 3’-5’ direction.
Answer: Option A. -> Synthesis of RNA from DNA
:
A
Transcription involves the synthesis of mRNA using DNA as the template. DNA molecule unwinds and only one strand is used as the template. This is the first step in the central dogma of molecular biology and it takes places in the nucleus.
:
A
Transcription involves the synthesis of mRNA using DNA as the template. DNA molecule unwinds and only one strand is used as the template. This is the first step in the central dogma of molecular biology and it takes places in the nucleus.
Answer: Option A. -> Single base substitution mutation
:
A
Sickle cell anaemia is caused by the substitution of a single nucleotide in the gene sequence, which eventually leads to the replacement of the amino acid glutamic acid with valine, affecting the final protein formed.
:
A
Sickle cell anaemia is caused by the substitution of a single nucleotide in the gene sequence, which eventually leads to the replacement of the amino acid glutamic acid with valine, affecting the final protein formed.
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