Specialized symbiotic associations between the roots of plants and fungi are called
A. a mycelial unit.
B. heterokaryotic junctions.
C. lichens.
D. hyphal associations.
E. mycorrhizae.
Answer: E
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The plant alkaloid ricin is nontoxic inside castor beans, but becomes active when digested by an animal. The toxic form of ricin kills by
A. inactivating the animal's immune system. B. over stimulating the animal's heart rate. C. inactivating ribosomes needed for translation. D. binding to RNA polymerase. E. releasing cyanide.
A population that is growing exponentially in the absence of limiting factors can be illustrated by which curve?
a. S-shaped b. J-shaped c. one that terminates in a plateau phase d. bimodal e. binomial
Viruses that infect bacteria are called ________
A) phages B) plasmids C) viroids D) vectors
Receptor mediated endocytosis:
A. is involved in receptor recycling B. involves cell membrane fusion C. can involve the protein clatherin D. can induce a refractory period for signal transduction E. all of the above