Phagocytosis leads to destruction of engulfed pathogens by which of the following mechanisms?
A. Complement fixation
B. Lysosomal-mediated hydrolysis
C. Production of bacteriocins
D. All of the choices are correct.
Answer: B
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During the Permian extinction, what percentage of genera in the ocean disappeared?
A. 90% B. 25% C. 50% D. 75% E. 95%
In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?
A. indicator species. B. flagship species. C. keystone species. D. dominant species. E. umbrella species.
In what part of a chloroplast are chlorophyll and accessory photosynthetic pigments associated?
a. stroma b. stroma grana c. thylakoid membranes d. mesophyll membranes e. light reaction centers of the stroma lamellae
Which statement is true of embryonic splitting?
A. It never occurs in nature. B. It involves the genetic contribution of only one parent. C. It produces immediate differentiation. D. It is applied in animal husbandry to produce genetically diverse offspring. E. It produces identical twins.