NSO Level 1- Science Olympiad (SOF) Class 12: Questions 15 - 17 of 106

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Question 15

Question

MCQ▾

There is a rare human genetic disease called Maple syrup urine disease that runs in families. Babies who are affected by this disease have urine odor like maple syrup and it occurs because of metabolic disorder. The babies die at an early age if not treated. The parents are never affected with these symptoms but, the child got the disease. What type of gene is it if the disease is caused by a single gene?

Choices

Choice (4)Response

a.

Recessive

b.

Sex linked dominant

c.

X – linked Dominant

d.

Dominant

Question 16

Question

MCQ▾

What does an operator gene combine to in E. coli cell, according to operon theory?

Choices

Choice (4)Response

a.

Repressor to switch off structural gene transcription

b.

Regulator in order to switch on structural gene transcription

c.

Inducer so that structural gene transcription is switched on

d.

Repressor in order to switch on structural gene transcription

Question 17

Question

MCQ▾

Which of the following is not an essential attribute that a biological molecule would need to be a useful genetic material?

Choices

Choice (4)Response

a.

It must carry all of the information needed to direct the specific organization and metabolic activities of the cell.

b.

It must have highly repetitive DNA sequences.

c.

It must be capable of undergoing occasional mutations, such that the information it carries is altered in a beneficial way.

d.

All of the above

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