IPTG (I-8000, I-8050) is an artificial inducer of the lac operon. IPTG binds to the lac repressor and inactivates it, preventing its binding to the lac operator and thus inducing the expression of beta-galactosidase. IPTG cannot be hydrolyzed and broken down by the cell and is therefore called a “gratuitous” inducer.

Correct Option: B

IPTG (I-8000, I-8050) is an artificial inducer of the lac operon. IPTG binds to the lac repressor and inactivates it, preventing its binding to the lac operator and thus inducing the expression of beta-galactosidase. IPTG cannot be hydrolyzed and broken down by the cell and is therefore called a “gratuitous” inducer.

Prokaryotes do not carry out the same kinds of post- translational modifications such as glycosylation, phosphorylation as eukaryotes do. This affects a protein’s activity or stability, or at least its response to antibodies.

Correct Option: A

Prokaryotes do not carry out the same kinds of post- translational modifications such as glycosylation, phosphorylation as eukaryotes do. This affects a protein’s activity or stability, or at least its response to antibodies.

ligation is the ATP dependent procedure. The mechanism of DNA ligase is to form two covalent phosphodiester bonds between 3′ hydroxyl ends of one nucleotide, (“acceptor”) with the 5′ phosphate end of another (“donor”). ATP is required for the ligase reaction.

Correct Option: A

ligation is the ATP dependent procedure. The mechanism of DNA ligase is to form two covalent phosphodiester bonds between 3′ hydroxyl ends of one nucleotide, (“acceptor”) with the 5′ phosphate end of another (“donor”). ATP is required for the ligase reaction.

ACC synthase catalyzes the synthesis of ACC, a precursor for ethylene. Ethylene serves as a hormone in plants for stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves and hence none of the given options is suitable.

Correct Option: D

ACC synthase catalyzes the synthesis of ACC, a precursor for ethylene. Ethylene serves as a hormone in plants for stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves and hence none of the given options is suitable.

Ionizing radiation is generally harmful and potentially lethal to living things but can have health benefits in radiation therapy for the treatment
treatment of cancer and thyrotoxicosis. Its most common impact is the induction of cancer with a latent period of years or decades after exposure. High doses can cause visually dramatic radiation burns, and/or rapid fatality through acute radiation syndrome. Controlled doses are used for medical imaging and radiotherapy. Some scientists suspect that low doses may have a mild hormetic effect that can improve health.

Correct Option: C

Ionizing radiation is generally harmful and potentially lethal to living things but can have health benefits in radiation therapy for the treatment
treatment of cancer and thyrotoxicosis. Its most common impact is the induction of cancer with a latent period of years or decades after exposure. High doses can cause visually dramatic radiation burns, and/or rapid fatality through acute radiation syndrome. Controlled doses are used for medical imaging and radiotherapy. Some scientists suspect that low doses may have a mild hormetic effect that can improve health.