When erythrocytes are old or die, how are they removed from the blood stream?
a. the liver filters them out
b. they break up into small particles and are cleared out by the kidneys.
c. they dissolve into liquid and circulate in that form in the blood
d. they are attacked by macrophages and removed
e. they stay as intact dead cells and are filtered out by the kidneys
D
You might also like to view...
During spring time in Maine, male moose often enter a cow pasture and begin calling to the female cows. The moose may even try to mount the female but the male genitalia do not fit properly inside the female genitalia. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
Plasma membranes, the key boundary layer of cells, are composed of amphipathic molecules called phospholipids. Why would neither purely hydrophilic nor purely hydrophobic molecules be a suitable molecule for plasma membranes?
A) Hydrophobic molecules would dissolve in the aqueous environment in which cells live, disrupting the structural integrity of the cell, while hydrophilic molecules could not interact. B) Both hydrophilic and hydrophobic molecules would dissolve in the aqueous environment in which cells live, disrupting the structural integrity of the cell. C) Hydrophilic molecules would dissolve in the aqueous environment in which cells live, disrupting the structural integrity of the cell. D) Hydrophobic molecules would be unable to interact with the aqueous environment in which cells live. E) Hydrophilic molecules would dissolve in the aqueous environment in which cells live, disrupting the structural integrity of the cell, and hydrophobic molecules would be unable to interact with the aqueous environment in which cells live.
Which of the following is NOT a potential fate of foreign DNA transferred via conjugation?
a. degradation by restriction enzymes b. recombination with the host chromosome c. replication by itself (if containing an origin of replication) d. All of the above are potential fates.
Which products are produced during aerobic respiration?
A water and glucose B glucose and oxygen C carbon dioxide and water D oxygen and carbon dioxide