Sporopollenin is:
A. a tough protective covering on spores
B. pollen that is produced in a sporophyte
C. the conversion of pollen to spores
D. a capsule housing pollen
E. All of the other choices provided are incorrect
A. a tough protective covering on spores
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The loss of function of the ____ renders fish unable to school
a. vestibular apparatus b. statocyst c. lateral line d. eyes e. saccule
The neuron transport proteins that maintain the
resting membrane potential and restore ion gradients following an action potential are a. sodium-phosphorus passive transporters. b. sodium-potassium pumps. c. sodium-chlorine gated channels. d. phosphorus-calcium pumps. e. phosphorus-chlorine gated channels.
In the chloride shift, __________ move into RBCs to replace the __________ that move out
a. oxygen molecules; chloride ions b. carbon dioxide molecules; chloride ions c. bicarbonate ions; chloride ions d. chloride ions; oxygen molecules e. chloride ions; bicarbonate ions
The difference between pinocytosis and receptor-mediated endocytosis is that _____
A) pinocytosis brings only water molecules into the cell, but receptor-mediated endocytosis brings in other molecules as well. B) pinocytosis increases the surface area of the plasma membrane, whereas receptor-mediated endocytosis decreases the plasma membrane surface area. C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity. D) pinocytosis can concentrate substances from the extracellular fluid, but receptor-mediated endocytosis cannot.