What adaptation have the freshwater bdelloid rotifers used to allow them to acquire genetic diversity while reproducing only via asexual reproduction?
What will be an ideal response?
These rotifers can import genes from bacteria, fungi, protists, and even plants. Each rotifer is a genetic mosaic whose DNA spans almost all the major kingdoms of life: About 10 percent of its active genes have come from other organisms.
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In rabbits, four alleles exist for the c gene. The wild-type version, C+C+, is expressed as brown fur. The chinchilla phenotype, cchcch, is expressed as black-tipped white fur. The Himalayan phenotype, chch, has black fur on the extremities and white fur elsewhere. Finally, the albino, or “colorless” phenotype, cc, is expressed as white fur. This is an example of which type of inheritance?
a. codominance b. multiple mutations c. multiple alleles d. recessive lethal
Which of the following species is NOT likely to be considered a keystone species?
a. a top predator, such as a wolf, whose diet serve to control the prey population size, which also indirectly affects the abundance and growth of vegetation b. a fish species that specializes in eating only a few aquatic plant species and that does not form a main component of the diet of the carnivores in the system c. an insect whose foraging movements result in the movement of pollen and fertilization of many kinds of plant species d. all of the above are examples that describe keystone species e. none of the above is an example that describes keystone species
During the inflammatory response, which cells release histamine?
a. T cells b. mast cells c. macrophages d. neutrophils e. eosinophils
A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)
A) obligate aerobe. B) facultative anaerobe. C) aerotolerant anaerobe. D) microaerophile. E) obligate anaerobe.