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Q. No.All the termination codons of universal genetic codes begin with a nucleotide, that is
1. Adenine
2. Cytosine
3. Uracil
4. Thymine
Subtopic: Genetic Code |
66%
From NCERT
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N-glycosidic linkages in a polynucleotide chain join
1. A nitrogenous base to a pentose sugar
2. A nucleotide to a ribose sugar
3. A nucleoside to a pentose sugar
4. A phosphate group to a nucleoside
1. A nitrogenous base to a pentose sugar
2. A nucleotide to a ribose sugar
3. A nucleoside to a pentose sugar
4. A phosphate group to a nucleoside
Subtopic: The DNA |
82%
From NCERT
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Read the following statements and choose the correct one (s).
A. During DNA replication, Adenine pairs with Uracil
B. Chargaff's rule is applicable only for double stranded DNA.
C. The area with long sequence of short repetitive DNA is called satellite DNA.
1. A and B
2. B and C
3. Only B
4. Only C
A. During DNA replication, Adenine pairs with Uracil
B. Chargaff's rule is applicable only for double stranded DNA.
C. The area with long sequence of short repetitive DNA is called satellite DNA.
1. A and B
2. B and C
3. Only B
4. Only C
Subtopic: The DNA | DNA Double Helix | DNA Fingerprinting |
63%
From NCERT
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The structures which appear as "beads on string" in chromatin under electron microscope have all of the following histone proteins, except
1. \(\mathrm{H}_2 \mathrm{~A}\)
2. \(\mathrm{H}_3\)
3. \(\mathrm{H}_2 \mathrm{~B}\)
4. \(\mathrm{H}_1\)
1. \(\mathrm{H}_2 \mathrm{~A}\)
2. \(\mathrm{H}_3\)
3. \(\mathrm{H}_2 \mathrm{~B}\)
4. \(\mathrm{H}_1\)
Subtopic: DNA Packaging |
82%
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Identify the incorrect difference between prokaryotic and eukaryotic transcription.
| Prokaryotic Transcription | Eukaryotic Transcription | |
| 1. | Splicing is generally not required | Splicing is required |
| 2. | There is only one type of RNA polymerase | There are three types of RNA polymerase |
| 3. | Structural gene is polycistronic | Structural gene is monocistronic |
| 4. | Post transcriptional modification takes place in the cytoplasm | Post transcriptional modification takes place in the nucleolus |
Subtopic: Transcription |
68%
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Match the following columns and select the correct option.
| a. | UAG | (i) | Codes for amino acid Tryptophan |
| b. | AUG | (ii) | Start codon |
| c. | UUU | (iii) | Codes for phenylalanine |
| d. | UGG | (iv) | Nonsense codon |
| a | b | c | d | |
| 1. | (ii) | (i) | (iii) | (iv) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (iv) | (ii) | (iii) | (i) |
| 4. | (iv) | (i) | (iii) | (ii) |
Subtopic: Genetic Code |
81%
From NCERT
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Select the correct statement(s) about lac operon
a. Glucose or galactose act as inducer for the expression of lac operon
b. In the presence of lactose the repressor protein binds with the lactose molecules
c. It is an example of repressible operon system
d. Its regulation by repressor protein is called positive regulation.
1. a and b
2. b and c
3. Only b
4. Only d
a. Glucose or galactose act as inducer for the expression of lac operon
b. In the presence of lactose the repressor protein binds with the lactose molecules
c. It is an example of repressible operon system
d. Its regulation by repressor protein is called positive regulation.
1. a and b
2. b and c
3. Only b
4. Only d
Subtopic: Gene Regulation: Lac Operon |
From NCERT
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The genes in eukaryotes are said to be split as
1. They have introns only
2. They have interrupted coding sequences
3. Mature mRNA contains both exons and introns
4. They have exons only
1. They have introns only
2. They have interrupted coding sequences
3. Mature mRNA contains both exons and introns
4. They have exons only
Subtopic: Transcription |
69%
From NCERT
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Select the true statement(s) for AUG.
A. It codes for an amino acid methionine
B. It is an initiation codon
C. It is a non-degenerate codon
1. Only A
2. Only A and B
3. Only B and C
4. All A, B and C
A. It codes for an amino acid methionine
B. It is an initiation codon
C. It is a non-degenerate codon
1. Only A
2. Only A and B
3. Only B and C
4. All A, B and C
Subtopic: Genetic Code |
67%
From NCERT
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Mark the wrong statement.
1. In prokaryotes, transcription and translation occur in the different compartments
2. In eukaryotes, usually structural gene of transcription unit is monocistronic
3. In prokaryotes, the mRNA is produced in the cytoplasm
4. In eukaryotes, the primary transcript undergoes splicing
1. In prokaryotes, transcription and translation occur in the different compartments
2. In eukaryotes, usually structural gene of transcription unit is monocistronic
3. In prokaryotes, the mRNA is produced in the cytoplasm
4. In eukaryotes, the primary transcript undergoes splicing
Subtopic: Transcription |
79%
From NCERT
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