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The Hypothalamus and Its Hormones

The mode of a...

Question

The mode of action of steroid hormones involves

A

A second messenger

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B

Modification of enzyme activity

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C

Stimulation of DNA replication

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D

Stimulation of mRNA transcription

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Solution

The correct option is C A second messenger
A. A second messenger
EXPLANATION: Steroid hormones are derived from cholesterol. This hormone is associated with a G-protein. This G-protein becomes activated when the hormone binds the receptor. Steroid hormone involves a second messenger when it is in the mode of action.

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Q. The sequence of events mentioned below are symbolised by alphabets. Choose the correct answer where the alphabets are matched with the processes.
A B C D
RNA

\to

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Q. How many of the following statements are correct ?

A. DNA dependent DNA polymerase requires DNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

B. DNA dependent DNA polymerase requires RNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

C. During replication, unwinding of DNA double helix forms a fork-like structure called replication fork.

D. During transcription, unwinding of the DNA double helix by DNA dependent RNA polymerase forms a transcription bubble.

E. During transcription, unwinding of DNA double helix by DNA dependent RNA polymerase forms a transcription fork.

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D N A (i) - \to h n R N A (i i) - - \to m R N A (i i i) - - \to P r o t e i n s

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