11th And 12th > Biology
MOLECULAR BASIS OF INHERITANCE MCQs
Total Questions : 75
| Page 1 of 8 pages
Answer: Option C. ->
61
:
C
Of all the 64 codons, three are known as termination codons or stop codons, which do not code for any amino acid. They are UAA, UAG and UGA. They act as stop signals for protein synthesis. Remaining 61 codons code for 20 known amino acids.
:
C
Of all the 64 codons, three are known as termination codons or stop codons, which do not code for any amino acid. They are UAA, UAG and UGA. They act as stop signals for protein synthesis. Remaining 61 codons code for 20 known amino acids.
Answer: Option D. ->
Okazaki and Okazaki
:
D
:
D
DNA replication is ‘semi-discontinuous’ because one of the strands is synthesised continuously, while the other strand, discontinuously by the formation of Okazaki fragments. This was discovered in the year 1968 by a Japanese scientist couple - Reiji Okazaki and his wife Tsuneko Okazaki. The term ‘Okazaki fragments’ has been given after them.
Answer: Option A. ->
X-ray diffraction
:
A
:
A
Rosalind Franklin, a young biophysicist, was working on the structure of DNA around the same time as Watson and Crick. While they initially came up with a triple helical structure, she already had a strong clue that DNA is a double helix, through the images that she had developed through X-ray diffraction. Unfortunately, she wasn’t alive to share the Nobel Prize with them in the year 1962.
Answer: Option B. ->
False
:
B
:
B
DNA is a long molecule compactly arranged in the nucleus of the cell. When stretched out, the length of the DNA molecule from a single cell measures longer than the average height of a human being.
Answer: Option D. ->
Virus that infects bacteria
:
D
A bacteriophage is a type of virus that infects bacteria. It acts as a medium of gene transfer among bacteria by the process called transduction (phage-mediated gene transfer).
:
D
A bacteriophage is a type of virus that infects bacteria. It acts as a medium of gene transfer among bacteria by the process called transduction (phage-mediated gene transfer).
Answer: Option D. ->
Virus that infects bacteria
:
D
A bacteriophage is a type of virus that infects bacteria. It acts as a medium of gene transfer among bacteria by the process called transduction (phage-mediated gene transfer).
:
D
A bacteriophage is a type of virus that infects bacteria. It acts as a medium of gene transfer among bacteria by the process called transduction (phage-mediated gene transfer).
Answer: Option D. ->
Okazaki and Okazaki
:
D
:
D
DNA replication is ‘semi-discontinuous’ because one of the strands is synthesised continuously, while the other strand, discontinuously by the formation of Okazaki fragments. This was discovered in the year 1968 by a Japanese scientist couple - Reiji Okazaki and his wife Tsuneko Okazaki. The term ‘Okazaki fragments’ has been given after them.
Answer: Option C. ->
Hugo de Vries
:
C
Mutation was first observed by Hugo de Vries in 1886 while studying the evening primrose Oenothera lamarckiana. He noticed wild varieties of the plant that differed from the original cultivated species.
:
C
Mutation was first observed by Hugo de Vries in 1886 while studying the evening primrose Oenothera lamarckiana. He noticed wild varieties of the plant that differed from the original cultivated species.
Answer: Option C. ->
A is true and R is false
:
C
Gene expression results in the formation of a protein, and hence, involves both transcription and translation. This however, is controlled by various mechanisms in different organisms. The phenomenon by which expression of these genes is regulated is known as gene regulation. This basically means that gene regulation involves switching on or off of the genes.
:
C
Gene expression results in the formation of a protein, and hence, involves both transcription and translation. This however, is controlled by various mechanisms in different organisms. The phenomenon by which expression of these genes is regulated is known as gene regulation. This basically means that gene regulation involves switching on or off of the genes.
Answer: Option A. ->
Both A and R are true and R explains A
:
A
During transcription, one of the two DNA strands of the double helix acts as a template for the synthesis of mRNA. This is known as the template strand or antisense strand, and runs along the 3’-5’ direction. The other DNA strand which runs in the 5’-3’ direction is known as the coding strand or sense strand. This appears exactly like the newly transcribed mRNA strand (except that ‘T’ and ‘U’ would differ respectively).
:
A
During transcription, one of the two DNA strands of the double helix acts as a template for the synthesis of mRNA. This is known as the template strand or antisense strand, and runs along the 3’-5’ direction. The other DNA strand which runs in the 5’-3’ direction is known as the coding strand or sense strand. This appears exactly like the newly transcribed mRNA strand (except that ‘T’ and ‘U’ would differ respectively).
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