MERS is a human coronavirus. It is an enveloped virus with a positive ssRNA genome. The envelope is acquired
a) during the initial contact with the host cell
b) during penetration of the host cell when endocytosis occurs
c) during viral release from the host cell
d) during viral protein translation
Answer: c) during viral release from the host cell
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True or false: Bushmen hunters exploit the effects of physiological stress by forcing their prey to run when the temperature exceeds the animal's core temperature
A. true B. false
Factors that govern microevolution are rooted in two related phenomena, they are
A. first, introduction of new genetic variation into a population and second, mutations. B. first, altering the prevalence of a given allele or genotype in a population and second mutations. C. first, introduction of new genetic variation into a population and altering the prevalence of a given allele or genotype in a population. D. first, splitting up a population and second migration. E. first, nonrandom mating and second no natural selection.
Ecdysozoans
A) have a special feeding structure. B) periodically shed their outer body covering. C) have trochophore larva. D) include mollusks, annelids, and flatworms. E) have a body cavity that forms from the digestive system.
The active site of an enzyme ____.
A. is where the coenzyme is located B. is a specific bulge or protuberance on an enzyme C. is a groove or crevice in the structure of the enzyme complementary to the substrate D. will react with only one substrate no matter how many molecules may resemble the shape of the substrate E. rigidly resists any alteration of its shape