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: Â DNA Double Helix |
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Level 1: 80%+
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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: Â DNA Fingerprinting |
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Level 1: 80%+
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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: Â Human Genome Project |
 74%
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: Â 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: Â Search for Genetic Material |
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Level 2: 60%+
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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: Â 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: Â The DNA |Â DNA Double Helix |
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In the human genome:
| 1. | the total number of genes are about 60000 |
| 2. | less than 2 percent of genome does not code for proteins |
| 3. | repeated sequences are rarely found |
| 4. | SNPa occur at about 1.4 million locations |
Subtopic: Â Human Genome Project |
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Level 1: 80%+
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Identify the incorrect match:
| mRNA codon | Amino acid | |
| 1. | AUG | Methionine |
| 2. | GGG | Glycine |
| 3. | UGA | Tryptophan |
| 4. | UAG | None; it is a stop codon |
Subtopic: Â Genetic Code |
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Identify the incorrect statement:
| 1. | Transcription and translation can be coupled in prokaryotes |
| 2. | DNA is a better genetic material than RNA |
| 3. | It is the presence of structural gene in a transcription unit that defines the template and coding strands |
| 4. | RNA polymerase III is responsible for transcription of tRNA, 5srRNA and snRNAs |
Subtopic: Â Transcription |
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Level 2: 60%+
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