The nonporous, flexible central region of a tracheid wall pit in conifers is called
a. resin duct
b. torus
c. end wall
d. sorus
e. xylet
Ans: b. torus
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In the life cycle of a fern, what is the name of the structure that produces the haploid spores?
a. sori b. rhizome c. gametophyte d. gametangium e. strobilus
A normally functioning pancreas produces insulin, a hormone that causes cells to ____
a. produce glucagon b. take up and store glucose c. synthesize protein d. break down glucose e. produce glucagon
Four of the five answers listed below are used in descriptions of neuron membranes. Select the
exception. a. gate b. pump c. wave of depolarization d. channel e. synaptic cleft
What organelle modifies new polypeptides and sorts proteins and lipids?
a. nucleus b. mitochondria c. peroxisomes d. lysosomes e. Golgi body