Protein and Nuclei Acids MCQ Questions & Answers

21

The first level of regulation of gene expression in eukaryotes is

A) Transcription B) DNA methylation and chromatin structure C) RNA processing D) Post transcriptional modification

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Answer & Solution

Answer: Option B

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22

Enzyme which digest nucleic acid by hydrolyzing phosphodiester bonds are called as

A) Nucleases B) Deoxyribonucleases (if substrate is DNA) C) Ribonucleases (if substrate is RNA) D) All of the above

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Answer & Solution

Answer: Option D

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23

The size of the maximum DNA insert that can be cloned in a YAC

A) < 300 kb B) 100 - 300 kb C) 70 - 100 kb D) 200 - 2000 kb

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Answer & Solution

Answer: Option D

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24

In a double stranded molecule of DNA, the ratio of purines : pyrimidines is

A) Variable B) Determined by the base sequence in RNA C) Genetically determined D) Always 1 : 1

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Answer & Solution

Answer: Option D

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25

The smallest plant genome identified

A) Chlorella B) Oryza sativa C) Arabidopsis D) Ground nut

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Answer & Solution

Answer: Option C

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26

Which one of the following amino acid has crucial role in the variability of protein structure?

A) Glycine B) Cysteine C) Aspartic acid D) Glutamic acid

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Answer & Solution

Answer: Option A

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27

Transcription is the process of

A) Synthesizing a DNA molecule from RNA template B) Using DNA strand as a template to synthesize a complementary RNA molecule C) Using DNA strand as template to synthesize identical RNA molecule D) Synthesizing a protein using information carried in the nucleotide sequence of a messenger RNA

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Answer & Solution

Answer: Option B

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28

The ability of proteins to absorb ultraviolet light is predominantly due to the presence of

A) Disulphide bond B) Hydrophobic amino acids C) Tryptophan D) Hydrophilic amino acids

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Answer & Solution

Answer: Option C

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29

Which of the following statement about the ribosome complex is correct?

A) Small subunit binds an mRNA and large subunit joint with the mRNA/small subunit complex to form a complete ribosome B) The large ribosomal subunit has a P site (peptidyl site) that holds the growing polypeptide chain and an A site (aminoacyl site) that binds the next amino acid to be added to the growing polypeptide chain C) The additon of new amino acid in the A site to the growing polypeptide chain is catalyzed by one of the enzymes that form the large ribosomal subunit D) All of the above

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Answer & Solution

Answer: Option D

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30

DNA polymerase involved in general DNA replication in eukaryotes is

A) α B) β C) A and B both D) γ

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Answer & Solution

Answer: Option C

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Protein and Nuclei Acids MCQ Questions & Answers | Biotechnology