What best describes the tunic of a tunicate?
A. It is made of keratin, like human hair.
B. It is made of chitin, like the shell of a crab.
C. It is made of calcium carbonate, like the shell of a clam.
D. It is made of cellulose, like the cell wall of a plant.
Answer: D
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Acetylcholine binds this membrane protein, which subsequently opens to allow sodium to enter the cell. Acetylcholine exerts its effect on what type of transport protein?
A. ligand-gated channel B. voltage-gated channel C. mechanosensitive-gated channels D. regulatory protein-gated channels E. stretch-sensitive gated channels
Cyanobacteria ________
a. are ancient species that released oxygen during photosynthesis b. can withstand exposure to boiling water c. cannot perform nitrogen fixation d. are thought to be very similar to the first cells in existence
On food packages, to what does the term "insoluble fiber" refer?
A) cellulose B) polypeptides C) starch D) amylopectin E) chitin
If a guard cell expressed a potassium channel that constantly pumped potassium into the cell, what would be the effect on the stomata?
A. Stomata would be always open. B. Stomata would function normally. C. Stomata would open and close at random. D. Stomata would be always closed.