Nucleic Acids - Mock Test 27

Question 261

Silencer elements?

A) Are trans-acting factors B) Are present between promoters and the structural genes C) Decrease the expression of some structural genes D) Encode specific repressor proteins

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Question 262

cis-acting elements include?

A) Steroid hormones B) Calcitriol C) Histones D) Silencers

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Question 263

Inducers and repressors are?

A) Enhancer and silencer elements respectively B) Trans-acting factors C) Cis-acting elements D) Regulatory proteins

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Question 264

Besides structural genes that encode proteins, DNA contains some regulatory sequences which are known as?

A) Operons B) Cistrons C) Cis-acting elements D) Trans-acting factors

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Question 265

The half-life of a protein depends upon its?

A) Signal sequence B) N-terminus amino acid C) C-terminus amino acid D) Prosthetic group

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Question 266

The signal sequence of proteins is cleaved off?

A) On the ribosomes immediately after synthesis B) In the endoplasmic reticulum C) During processing in Golgi apparatus D) During passage through the cell membrane

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Question 267

SRP receptors involved in protein export are present on?

A) Ribosomes B) Endoplasmic reticulum C) Golgi appartus D) Cell membrane

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Question 268

The proteins destined to be transported out of the cell have all the following features except?

A) They possess a signal sequence B) Ribosomes synthesizing them are bound to endoplasmic reticulum C) After synthesis, they are delivered into Golgi apparatus D) They are tagged with ubiquitin

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Question 269

Diphtheria toxin inhibits?

A) Prokaryotic EF-1 B) Prokaryotic EF-2 C) Eukaryotic EF-1 D) Eukaryotic EF-2

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Question 270

Puromycin causes premature chain termination in?

A) Prokaryotes B) Eukaryotes C) Both A and B D) None of these

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