The introduction of a naked DNA, linear or circularized, into a bacterium has been described as
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Biology GK · all questionsGentics and Evoloution
Gentics and Evoloution
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Replacement phage vectors can accommodate
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Among the following which one is not an ape?
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The synthesis of RNA chain is energised by expenditure of energy in the form of
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The sudden origin of new species, new higher taxa, or quite generally of new types by some sort of saltation has been termed
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Consider the following statements regarding the nonhistone chromosomal proteins and choose the correct answer:
1. Nonhistone chromosomal (NHC) proteins occur in far great variety of forms than histones
2. Different tissues in the same organism differ in their NHC protein pattern
3. NHC proteins have been localized in the active regions of the chromosomes
4. Inhibition of transcription caused by histones is reversed on addition of NHC proteins
1. Nonhistone chromosomal (NHC) proteins occur in far great variety of forms than histones
2. Different tissues in the same organism differ in their NHC protein pattern
3. NHC proteins have been localized in the active regions of the chromosomes
4. Inhibition of transcription caused by histones is reversed on addition of NHC proteins
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Which of the following is an example of bioherbicide?
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If two breaks occur in one chromosome, and one in a non-homologous one, the fragment from the first chromosome may become joined in an intercalary position in the second chromosome. This is a case of
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The hydrophilic nature of DNA is due to the presence of
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The DNA strands separated into a fork, at the Ori C are bound by which of the following to keep them rigid and separate?
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Who proposed 3-D helical DNA model?
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Which of the following are the most important among fossils since they show microscopic tissue structure often to the finest details?
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Consider the following statements and choose the correct answer:
1. Adenine pairs with thymine (A : T) and guanine with cytosine
2. Adenine and thymine are joined by three hydrogen bonds through atoms
3. Guanine and cytosine are joined by two hydrogen bonds through atoms
4. The weak hydrogen bonding enables the two strands of the DNA to separate during replication
1. Adenine pairs with thymine (A : T) and guanine with cytosine
2. Adenine and thymine are joined by three hydrogen bonds through atoms
3. Guanine and cytosine are joined by two hydrogen bonds through atoms
4. The weak hydrogen bonding enables the two strands of the DNA to separate during replication
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Triticale, the first man made crop was derived by crossing
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Consider the following statements regarding the conclusions drawn from fossil records and choose the correct answer:
1. There existed a multitude of diversified animal groups, similar to the animal groups that exist today
2. The most primitive forms of life are found in the oldest rocks
3. None of the past forms of life are exactly like any of those now living
4. All fossils did not appear at a time, but appeared during different great spans of times
1. There existed a multitude of diversified animal groups, similar to the animal groups that exist today
2. The most primitive forms of life are found in the oldest rocks
3. None of the past forms of life are exactly like any of those now living
4. All fossils did not appear at a time, but appeared during different great spans of times
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Consider the following statements regarding the origin of protobionts (protocells) and choose the correct answer:
1. The self-assembly process is internally controlled by selective intermolecular forces
2. The protocells possessed lipids, nucleic acids and had a definite molecular configuration
3. The protocells were heterotrophic
4. The instructions for the behaviour in the protocellular life-cycle were in the protenoids
1. The self-assembly process is internally controlled by selective intermolecular forces
2. The protocells possessed lipids, nucleic acids and had a definite molecular configuration
3. The protocells were heterotrophic
4. The instructions for the behaviour in the protocellular life-cycle were in the protenoids
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The unit of DNA responsible for the appearance and inheritance of a character is known as a
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Who among the following is called the "Father of genetics"?
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Match the following lists:
| List-I (Discoverer) | List-II (Discovery) |
| a. Jenner | 1. Blood grouping |
| b. Watson | 2. Penicillin |
| c. Landsteiner | 3. Vaccination |
| d. Fleming | 4. Double helix |
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Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Oenothera lamarckiana | 1. Autoallohexaploid |
| b. North American cotton plant | 2. Autotetraploid |
| c. Triticum vulgare | 3. Allohexapioid |
| d. Solanum nigrum | 4. Allotetraploid |
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