I. Adrenocortical secretion is controlled primarily by ACTH, from the anterior pituitary, but mineralocorticoid secretion is also subject to independent control by circulating factors.

II. Adrenal medullary hormones work mostly to prepare the body for emergencies, the so-called “fight-or-flight” responses.

III. All three cortical zones secrete corticosterone, but the active enzymatic mechanism for aldosterone biosynthesis is not limited to the zona glomerulosa.

IV. An important function of the zona glomerulosa, in addition to aldosterone synthesis, is the formation of new cortical cells.

#Question id: 63

#Unit 1. Molecules and their Interaction Relevant to Biology

The two molecules shown in the figures are best described as ________.

#Question id: 64

#Unit 1. Molecules and their Interaction Relevant to Biology

Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol ________.

#Question id: 65

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify which of the following pair is enantiomers, diastereomers or meso compounds.

#Question id: 66

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements regarding isomerism is incorrect regarding biomolecules?

#Question id: 67

#Unit 1. Molecules and their Interaction Relevant to Biology

When a region of DNA must be repaired by removing and replacing some of the nucleotides, what ensures that the new nucleotides are in the correct sequence?

#Question id: 68

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following functional groups given in column I with their respective representatives given in column II.

COLUMN I               COLUMN II

1. Anhydride               a. RCOOR

2. Ether                       b. ROCOCH3

3. Acetyl                     c. ROR

4. Amido                     d. RCOOCOR

5. Ester                        e. RCONH2