Approximately how many cells are present in the body of an adult person?

What does DNA stands for in biology? 

Consider the following statements regarding the inner membrane of the mitochondria.

I. It keeps a high concentration of $H^{+}$ in the intermembrane space.

II. It helps to arrange the different molecules of the electron transport chain in the right order.

III. It has proteins and phospholipids.

Which of the statements given above are correct?

Consider the following statements:

I. The chloroplast is involved in photosynthesis.

II. Mitochondria are considered as a powerhouse of the cell.

III. Ribosomes are involved in water movement in the cell.

Which of the following option is correct?

Consider the following statements related to the mitosis of an animal cell.

I. Cells have the least amount of DNA in the interphase period.

II. The amount of DNA throughout the interphase is not constant.

III. The nucleus has all DNA.

Which of the statements given above are correct?

Consider the following statements:

I. Prokaryotic cells have a primitive nucleus (without a nuclear membrane).

II. Eukaryotic cells have a true nucleus (with nuclear membrane).

Which of the following option is correct?

The powerhouse of a cell is the:

Consider the following statements regarding stem cells:

$1$. In our day-to-day lives, stem cells regularly replace dead cells from our body tissues.
$2$. Stem cells help in understanding the occurrence of degenerative diseases.

Which of the statement(s) given above is/are correct?