Questions and answers for exam Preparation

MCQs

Total Questions : 232 | Page 20 of 24 pages

Question 191. The increase in number of copies of genes is called

gene duplication
gene amplification
gene cloning
gene location

Discuss Question

Answer: Option B. -> gene amplification
Answer: (b).gene amplification

Question 192. Error in DNA replication that can produce duplications of short genetic sequence is called

ectopic recombination
replication slippage
retotransposition
aneuploidy

Discuss Question

Answer: Option B. -> replication slippage
Answer: (b).replication slippage

Question 193. Gel matrices are generally of two types Agarose and Polyacrylamide. Which of the statements is correct with respect to agarose gels?

Agarose is a polysaccharide which is obtained from red algae
Agarose is a polysaccharide obtained from fungus
It is composed of glucose residues
It is obtained via dissolving in its water by boiling in water and then cooling it

Discuss Question

Answer: Option A. -> Agarose is a polysaccharide which is obtained from red algae
Answer: (a).Agarose is a polysaccharide which is obtained from red algae

Question 194. In the case of electrophoresis of single stranded DNA or RNA, which type of gels are used?

Renaturing
Denaturing
The routine agarose gel
The routine polyacrylamide gel

Discuss Question

Answer: Option B. -> Denaturing
Answer: (b).Denaturing

Question 195. Polyacrylamide gels are the other types of gels which are commonly used. Which of the following statement is not correct with respect to these types of gels?

They are obtained via polymerization between acrylamide and bis-acrylamide
The components added for initiating polymerization are ammonium persulphate and TEMED
It is casted in horizontal and flat trays
TEMED catalyses the formation of free radicals from persulphate ions which leads to initiation of cross-linking

Discuss Question

Answer: Option C. -> It is casted in horizontal and flat trays
Answer: (c).It is casted in horizontal and flat trays

Question 196. If the amount of agarose added is more, the molecular under analysis should have the following characteristic:

small size
large size
size has no relation with the amount of agarose
the amount of molecules under analysis matters

Discuss Question

Answer: Option A. -> small size
Answer: (a).small size

Question 197. At times, a specific fragment of the molecules of DNA which are analyzed needs to be separated. One of the methods is digesting the gels simply. Which of the following statement is not correct in with respect to it?

The gelling temperature has an important role to play
For higher gelling temperatures, digestion of DNA is done via the addition of agarase or some chaotropic agents
For lower gelling temperatures, simply slicing out of target DNA is done which is followed by melting
The DNA can be extracted via the addition of sodium or any positively charged group

Discuss Question

Answer: Option D. -> The DNA can be extracted via the addition of sodium or any positively charged group
Answer: (d).The DNA can be extracted via the addition of sodium or any positively charged group

Question 198. The number of Y linked genes which have been identified are

Discuss Question

Answer: Option D. -> 200
Answer: (d).200

Question 199. The DNA in human Y chromosome is composed of about