What part of the human body contains strong salts that can kill bacteria?
a. lungs
b. mouth
c. small intestine
d. stomach
e. large intestine
c
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Sucrose moves into a cell against its concentration gradient at the same time that protons move into the cell along their concentration gradient. This is an example of ____.
a. symport b. passive diffusion c. antiport d. facilitated diffusion
e. active transportHow do ray-finned fish keep from sinking?
a. they are constantly swimming b. they don’t constantly swim but their fins are constantly moving c. they have lungs that are always filled with air d. they have a swim bladder that is filled with gas e. they have a skeleton that is less dense than the surrounding water
Which of the following is NOT true of the structures
labeled “D” in the figure? a. They are haploid. b. They will germinate to produce mycelia of different mating strains. c. They may fuse to produce a zygote. d. They result from sexual reproduction. e. They are spores.
Phenetics is the strictest of the systematicists.
a. true b. false