Meiosis
A. reduces chromosome number to 23.
B. produces diploid cells.
C. involves the repair and growth of all body cells.
D. All apply.
Answer: A
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Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers usually inactivate protein kinase enzymes. B) Second messengers usually act to remove nitric oxide (NO) from the cell. C) Cyclic AMP and calcium may be second messengers. D) Second messengers act through receptors called K-proteins.
Solutions A and B are separated by a selectively permeable barrier. Over time, the level of fluid on side A increases. Which solution initially had the higher concentration of solute?
What will be an ideal response?
Each year, approximately ________ of the adult skeleton is demolished and then rebuilt or replaced.
A) 1/2 (50%) B) 1/4 (25%) C) 1/3 (33.33%) D) 100% E) 1/5 (20%)
The enteric nervous system regulates much of the digestive activity, but its action depends on the central nervous system.
Answer the following statement true (T) or false (F)