GATE (Graduate Aptitude Test in Engineering) Microbiology: Questions 49 - 51 of 125

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Question 49

Appeared in Year: 2015

Question

MCQ▾

An E. coli strain is grown initially on glucose as the sole carbon source. Upon complete consumption of glucose following 12 h of growth, lactose is added as the sole carbon source and the strain is further grown for 12 h. Assuming that the E. coli strain has a functional wild type lac operon, which one of the following profiles is the most ACCURATE representation of β- galactosidase (β-gal) expression (in arbitrary units) ?

An E. Coli Strain

Choices

Choice (4)Response

a.

iv

b.

i

c.

ii

d.

iii

Question 50

Appeared in Year: 2016

Question

MCQ▾

E. coli requires three genes, galK (kinase) , galT (transacetylase) and galE (epimerase) to utilize galactose. If there is a mutation in any one of these genes, the mutant cannot utilize galactose. Which one of the following combinations of merodiploids will support the growth of mutants on galactose?

(P)

(Q)

(R)

(S)

Choose the Correct Option:

Choices

Choice (4)Response

a.

P & R

b.

Q & S

c.

R & S

d.

P & Q

Question 51

Appeared in Year: 2016

Question

MCQ▾

Which one of the following enzyme combinations allows some bacteria to utilize acetate through glyoxylate pathway?

(P) Isocitrate lyase

(Q) Isocitrate dehydrogenase

(R) Succinyl CoA synthetase

(S) Malate synthase

Choose the Correct Option:

Choices

Choice (4)Response

a.

P & S

b.

Q & R

c.

Q & S

d.

P & R

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