Question 1

DNA strands are antiparallel because of the presence of:

Accepted Answer

The two strands of DNA molecules run in opposite or antiparallel direction due to presence of hydrogen bond because two base i.e. one in each chain of DNA molecule, joined together by hydrogen bonds.

Question 2

Examine the following figures and select the right answer in which diagrammatic representation of a nucleotide is correctly shown.

Accepted Answer

Correct answer is A

Question 3

Which of the following bases is present in RNA in place of thymine?

Accepted Answer

Correct answer is A

Question 4

Nucleic acids were discovered by:

Accepted Answer

Correct answer is D

Question 5

In DNA molecule, which of the following base pair is present?

Accepted Answer

Adenine and thymine; because C always attaches with G and A attaches with T.

Question 6

The given diagram shows the nitrogenous bases. Identify the correct combination.

Accepted Answer

Correct answer is B

Question 7

The transformation experiments on Pneumococcus showed that:

Accepted Answer

Correct answer is C

Question 8

The base pairs of DNA are correctly shown as:

Accepted Answer

Correct answer is C

Question 9

Which one of the following is widely distributed in a cell?

Accepted Answer

RNA is present both inside and outside the nucleus.

Question 10

Who first used the term "enzyme"?

Accepted Answer

The term enzyme was used by Willy Kuhne while working on fermentation.

Question 11

Who coined the term zymase for enzymes in yeast?

Accepted Answer

Zymase is complex of enzyme. It obtained from yeast cell by Edward Buchner.

Question 12

Enzymes are basically:

Accepted Answer

All enzymes are proteins but all proteins are not enzyme.

Question 13

"Enzymes are proteins"; it was suggested by:

Accepted Answer

Correct answer is B

Question 14

Who got the Nobel prize working on enzymes in the year 1978?

Accepted Answer

Arber and Nathans got nobel prize in 1978 for the discovery of restriction endonucleases.

Question 15

To explain the mechanism of enzymatic action, who proposed "Lock and key hypothesis"?

Accepted Answer

Lock and key theory : Emil Fischer proposed this theory, according to which on the surface of enzymes a few elevations and ditches are found known as active sites and enzymes bind reactants on these sites to create reaction between them.

Question 16

Many of the hydrolytic reactions are:

Accepted Answer

Correct answer is A

Question 17

The "lock and key" model of enzyme action illustrates that a particular enzyme molecule:

Accepted Answer

Correct answer is B

Question 18

Enzymes were discovered for the first time in:

Accepted Answer

First time fermentative enzymes were discovered from yeast.

Question 19

Who discovered 'co-enzymes'?

Accepted Answer

Correct answer is B

Question 20

A competitive inhibitor of succinic dehydrogenase is:

Accepted Answer

Correct answer is C

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