Which of the following statements is true? (a) extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior. (b) to function, all extracellular signal molecules must be transported by their receptor across the plasma membrane into the cytosol. (c) a cell-surface receptor capable of binding only one type of signal molecule can mediate only one kind of cell response. (d) any foreign substance that binds to a receptor for a normal signal molecule will always induce the same response that is produced by that signal molecule on the same cell type.

Its option 'A'.

Explanation:

extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior.

For Example:

Acetylcholine acts at a GPCR on heart muscle to make the heart beat more slowly.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set