How many days after fertilization does implantation occur?
Ans: 5 - 10 days
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Sour taste receptors are stimulated by hydrogen ions of acidic food substances
Indicate whether the statement is true or false
After pepsinogen is activated, it
a. autocatalytically activates more pepsinogen b. activates pancreatic enzymes in the duodenum after gastric emptying has occurred c. inhibits the pyloric gland area in a negative-feedback fashion d. does a and b e. does none of the above
The sodium level inside and outside of a resting cell is an example of the
A. potential energy of an electron transport chain, because sodium has an extra electron to donate. B. potential energy of a concentration gradient, because sodium is more abundant outside the cell. C. conversion of potential energy to kinetic energy, because sodium can never move across the cell membrane and must move across its surface. D. kinetic energy of sodium rushing out of a cell down its concentration gradient. E. kinetic energy of the large difference in sodium concentration on the inside versus the outside of the cell.
Oxygen is required in biological systems for
A) cellular respiration. B) storage of energy. C) serving as a structural component of bone. D) serving as a catalyst. E) chemical messengers.