Q. The proteins of which of the following genes are regularly needed for cellular activity?

View solution

Q. Which of the following are the products of the constitutive gene?

i. Involved in the synthesis of structural elements of the cell
ii. Involved in catabolic pathway
iii. Involved in anabolic pathway
iv. Synthesized continuously

View solution

Q. Which of the following is not an example of allosteric regulation?

View solution

Q. Operons are ___________

View solution

Q. Which of the following are correct according to operons?

i) Consists of multiple genes organized between a promoter and a terminator
ii) Member genes regulate with coordination
iii) Usually controlled by autogenous transcription
iv) Contains genes for stress tolerance exclusively

View solution

Q. Choose the correct pair among the following.

View solution

Q. Which of the following is not present in the β-galactosidase structural gene and thus is not transcribed by the same promoter?

View solution

Q. Glucose, as the carbon source, is the first choice by bacteria even if other sugars are available. The mechanism behind this selectivity is ___________

View solution

Q. The lac operon is regulated by cAMP by ___________

View solution

Q. Tryptophan operon in E. coli is a repressible operon.

View solution

Q. Which of the following is true about tryptophan operon?

View solution

Q. The expression of the tryptophan operon is independent of the availability of tryptophan in culture media.

View solution

Q. The functional unit in which genes are arranged consecutively is known as ___________

View solution

Q. The investigation of the lac operon for the metabolism of lactose was done by __________

View solution

Q. Presence of lactose itself induces the production of β-galactoside transferase.

View solution

Q. How many enzymes are produced in the lac operon under the same promoter?

View solution

Q. Defects in which regions can affect the activity of the lac operon?

View solution

Q. If the lac operon of the genome of bacteria is always active it has a defect in which region of the operon?

View solution

Q. Lac operon follows a trans-acting control mechanism.

View solution

Q. According to the repressor of lac operon which of the following are false?

View solution