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Molecular Basis of Inheritance NEET Questions — Free MCQ Practice

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DNA replication in lagging strand of most of the eukaryotic organis ms is

A. conservative and continuous B. semiconservative but discontinuous C. conservative and semi- discontinuous D. semiconservative but continuous

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Explanation

DNA replication in the lagging strand of eukaryotic organisms is semiconservative but discontinuous. This means that each new DNA molecule consists of one old strand and one new strand (semiconservative), and replication on the lagging strand occurs in short segments called Okazaki fragments, which are later joined together (discontinuous).

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How many bases consist in an average gene ?

A. 300,000 B. 3000 C. 400,000 D. 4000

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Explanation

An average gene consists of about 3000 bases. This is a general estimate and can vary widely among different genes and organisms.

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Which plant was used by Taylor to prove semiconservative replication at chromosomal level?

A.

Haematoxylon

B.

Vicia faba

C.

Trillium

D.

Ophioglossum

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Explanation

fact

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State the use of moleculer medicine ?

A. Improves diagnosis of diseases B. Used as gene theraphy C. Used to understand several diseass like Alzheimerâ€™s Parkinsons diseases etc., D. All the above

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Explanation

Molecular medicine is a broad field that improves the diagnosis of diseases, is used in gene therapy, and helps in understanding several diseases like Alzheimer's and Parkinson's diseases. Therefore, all the options provided are correct.

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In Which of the following DNA not directly involved ?

A. Replication B. Transcription C. Translation D. Transformation

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Explanation

Translation is the process by which the genetic code carried by mRNA is decoded to produce the specific sequence of amino acids in a polypeptide chain. DNA is not directly involved in translation; instead, mRNA, tRNA, and ribosomes play key roles in this process.

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Transcription begins when one of the following enzymes binds to promotor site.

A. DNA polymerase B. RNA polymerase C. helicase D. Gyrase

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Explanation

Transcription begins when RNA polymerase binds to the promoter site on the DNA. This enzyme is responsible for synthesizing RNA by following the sequence of the DNA template strand.

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The question consist of two statements each Assertion (A) and Reason (R) So answer these question choose anyone of the following four respones A :- Operon concept was given by Hershey and chase R : - Separation of DNA fragments are done by centrifugation technique

A. If both (A) and (R) one true and (R) is the correct explanation of (A) B. If both (A) and (R) are true but (R) is not the correct explanation of (A) C. If (A) is true but (R) is false D. If both (A) and (R) as false

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Explanation

The operon concept was actually given by Jacob and Monod, not by Hershey and Chase. The separation of DNA fragments is most commonly done by gel electrophoresis, not by centrifugation. Therefore, both the assertion and the reason are false.

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The question consist of two statements each Assertion (A) and Reason (R) So answer these question choose anyone of the following four respones A :- DNA is cut into Sections byusing restriction endonucleases R : - Ligase is used to join DNA nucleotides

A. If both (A) and (R) one true and (R) is the correct explanation of (A) B. If both (A) and (R) are true but (R) is not the correct explanation of (A) C. If (A) is true but (R) is false D. If both (A) and (R) as false

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Explanation

Both Assertion (A) and Reason (R) are true. Restriction endonucleases are indeed used to cut DNA into sections, and ligase is used to join DNA nucleotides. However, the reason does not directly explain the assertion. The correct explanation for the use of restriction endonucleases is that they recognize specific sequences in DNA and cut them, which is different from the function of ligase, which joins DNA fragments.

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The question consist of two statements each Assertion (A) and Reason (R) So answer these question choose anyone of the following four respones A:- Abraham Linconhas been analyzed for evidence of a genetic disorder called Marfanâ€™s syndrome R :- An additional benefit of DNAfingerprint technology is the diognos is of inherited disorders

A. If both (A) and (R) one true and (R) is the correct explanation of (A) B. If both (A) and (R) are true but (R) is not the correct explanation of (A) C. If (A) is true but (R) is false D. If both (A) and (R) as false

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Explanation

Both Assertion (A) and Reason (R) are true. Abraham Lincoln has been analyzed for Marfan's syndrome, and DNA fingerprint technology can indeed be used to diagnose inherited disorders. However, the reason provided does not explain the assertion directly; it is an additional benefit of the technology.

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The question consist of two statements each Assertion (A) and Reason (R) So answer these question choose anyone of the following four respones A :- Helicase is called unwindase R :- DNA helix uncoils and splits into single strands by breaking of hydrogen bonds between complementary bases

A. If both (A) and (R) one true and (R) is the correct explanation of (A) B. If both (A) and (R) are true but (R) is not the correct explanation of (A) C. If (A) is true but (R) is false D. If both (A) and (R) as false

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Explanation

Both Assertion (A) and Reason (R) are true, and Reason (R) correctly explains Assertion (A). Helicase is called unwindase because it uncoils the DNA helix by breaking the hydrogen bonds between complementary bases, thereby splitting it into single strands.

Molecular Basis of Inheritance MCQs for NEET — Botany Questions with Answers

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