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Q. No.The tRNA molecule:
1.
looks like an inverted L in its secondary structure
2.
is the largest of the major cellular RNAs
3.
acts as an adapter molecule
4.
has catalytic functions
Subtopic: Translation |
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Level 1: 80%+
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In bacteria:
| 1. | translation can begin before the mRNA is fully transcribed |
| 2. | removal of introns from hnRNA is carried out by ribozymes |
| 3. | there are at least three different RNA polymerases to transcribe different RNA molecules |
| 4. | the transcription of mRNA takes place in a template independent manner |
Subtopic: Transcription |
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Level 2: 60%+
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Identify the incorrectly matched pair:
| 1. | Taylor | Radioactive thymidine |
| 2. | Meselson and Stahl | 15N |
| 3. | Hershey and Chase | 32P and 35S |
| 4. | Griffith | 14C |
Subtopic: Search for Genetic Material |
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The two polynucleotide strands in a dsDNA molecule are:
| 1. | parallel and identical |
| 2. | anti-parallel and identical |
| 3. | parallel and complementary |
| 4. | anti-parallel and complementary |
Subtopic: DNA Double Helix |
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The allele of a gene locus that is least frequent, in a population, has a frequency greater than 0.01. Such a gene locus will be called:
| 1. | Redundant | 2. | Degenerate |
| 3. | Polymorphic | 4. | Hot spot |
Subtopic: DNA Fingerprinting |
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In the human genome:
1. there are 3164.7 billion base pairs
2. largest known gene is HbS
3. more than 20 percent part codes for proteins
4. chromosome 1 has most genes
1. there are 3164.7 billion base pairs
2. largest known gene is HbS
3. more than 20 percent part codes for proteins
4. chromosome 1 has most genes
Subtopic: Human Genome Project |
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Level 2: 60%+
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In an operon:
| I: | a polycistronic structural gene is regulated by a common promoter and regulatory genes |
| II: | the regulation is always negative and inducible |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Gene Regulation: Lac Operon |
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The bacterium Escherichia coli was not used by:
| 1. | Fred Griffith, when he discovered bacterial transformation |
| 2. | Alfred Hershey and Martha Chase, when they conclusively proved that DNA is the molecule that stores genetic information |
| 3. | Matthew Meselson and F. Stahl, when they experimentally proved that DNA replicates semi-conservatively |
| 4. | Francois Jacob and Jacques Monod, when they proposed the working of lactose operon |
Subtopic: Search for Genetic Material |
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All the following statements regarding histones, the proteins used in packaging of DNA, are correct except:
| 1. | They are rich in amino acids - Lysine and Arginine. |
| 2. | They carry a positive charge on the side chain. |
| 3. | They are organized to form a unit of 8 molecules. |
| 4. | The pH of histones is slightly acidic. |
Subtopic: DNA Packaging |
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A double stranded DNA molecule from a bacteriophage is found to consist of 23% adenine bases. The expected percentage of guanine in this DNA molecule will be:
| 1. | 23 % | 2. | 27 % |
| 3. | 46 % | 4. | 54 % |
Subtopic: The DNA | DNA Double Helix |
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