Which organ does ADH most directly affect? The mass of DNA in a human body cell is approximately 6.5 picograms (pg). What is the approximate mass of DNA in a human gamete?

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Question 9:
ADH (Antidiuretic Hormone) plays a crucial role in regulating water balance in the body by increasing water reabsorption. This process primarily occurs in the kidneys.
The correct option is B) kidney.

• ADH acts on the collecting ducts and convoluted tubules of the kidneys, making them more permeable to water, thus increasing water reabsorption into the bloodstream.

Question 10:
A human body cell (somatic cell) is diploid ($2n$) and contains a full set of DNA. A human gamete (sperm or egg cell) is haploid ($n$) and contains half the amount of DNA found in a somatic cell.
Given that the mass of DNA in a human body cell is approximately 6.5 picograms (pg), the mass of DNA in a human gamete would be half of that.

$$\frac{6.5 \text{ pg}}{2} = 3.25 \text{ pg}$$

The closest option is A) 3.2 pg.