Which structure is the first to contain cells of a new individual?
a. egg
b. zygote
c. secondary oocyte
d. polar body
e. spermatid
ANSWER: b
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Which is true of heterotrophs?
A) They capture light energy. B) They cannot be unicellular. C) They store energy in the form of heat. D) They can function as autotrophs in an emergency. E) They can obtain energy by consuming phototrophs.
Which of the following statements concerning phospholipids is FALSE?
a. They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic. b. They are amphipathic molecules. c. They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. d. They contain a polar organic group attached to a phosphate group. e. They contain three fatty acids chains.
A drug that blocks the NaCl cotransporter on the cortical collecting duct apical membrane will have what effect on urinary sodium and water loss?
a. Urinary sodium and water output will decrease. b. Urinary sodium and water output will increase. c. Urinary sodium output will increase but water output will decrease. d. Urinary sodium output will decrease but water output will increase.
Sharks have a number of fleshy gill slits instead of a bony gill cover. How does this affect their behavior?
A. They live only in highly oxygenated water. B. Their movements are slow due to low oxygen. C. They do not maintain neutral buoyancy. D. They keep swimming to move water across their gills.