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

Biology & Microbiology

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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

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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.

Biology & Microbiology

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

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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.

Biology & Microbiology