Biology - Mock Test 36

Question 351

Consider the following two statements:<br> I- Cellular organization of the body is the defining feature of life forms.<br> II- Metabolic reactions cannot be demonstrated outside the body in cell-free systems

A) Both I and II are true and II explains I B) Both I and II are true but II does not explain I C) I is true but II is false D) Both I and II are false

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Question 352

Consider the following two statements:<br> I- In the single-celled organisms, we are not very clear about the usage of the two terms – growth and reproduction.<br> II- When it comes to unicellular organisms like bacteria, unicellular algae or amoeba, reproduction is synonymous with growth, i.e., increase in number of cells.

A) Both I and II are true and II explains I B) Both I and II are true but II does not explain I C) I is true but II is false D) Both I and II are false

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Question 353

Which of the following is less general in characters as compared to genus

A) Species B) Family C) Class D) Division

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Question 354

An attribute found in plants but not animals is

A) Metabolism B) Sexual reproduction C) Autotrophy D) Asexual reproduction

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Question 355

Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein

A) They only increase expression. B) They only decrease expression. C) They interact with RNA polymerase but do not affect the expression. D) They can act both as activators and as repressors.

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Question 356

Control of gene expression takes place at the level of

A) DNA-replication B) Transcription C) Translation D) None of the above

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Question 357

Which of the following steps in transcription is catalysed by RNA polymerase

A) Initiation B) Elongation C) Termination D) All of the above.

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Question 358

DNA is a polymer of nucleotides which are linked to each other by 3-5 phosphodiester bond. To prevent polymerisation of nucleotides, which of the following modifications would you choose?

A) Replace purine with pyrimidines B) Remove/Replace 3’ OH group in deoxyribose C) Remove/Replace 2’ OH group with some other group in deoxyribose D) Both b and c

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Question 359

The human chromosome with the highest and least number of genes in them are respectively

A) Chromosome 21 and Y B) Chromosome 1 and X C) Chromosome 1 and Y D) Chromosome X and Y.

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Question 360

The first genetic material could be

A) protein B) carbohydrates C) DNA D) RNA

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