Alleles carried on the X chromosome in humans occur in _____ copies in males
1.one
2.two
3.three
4.four
5.five
1
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Microbial antagonism means that
A) good microbes are replaced by invading pathogenic microbes. B) good microbes establish themselves in the host and prevent invasion by pathogenic microbes. C) the host is predisposed to disease due to the microbes they harbor. D) pathogenic bacterial growth is encouraged by the presence of established host organisms.
A region's biodiversity is measured at three levels: _____ within species, _______diversity, and _______diversity.
Fill in the blank(s) with the appropriate word(s).
The sharp, inch-long thorns of the crown-of-thorns sea star are its spines. These spines, unlike those of most other sea stars, contain a potent toxin
If it were discovered that crown-of-thorns sea stars do not make this toxin themselves, then the most likely alternative would be that this toxin is _____. A) derived from the nematocysts of its prey B) absorbed from the surrounding seawater C) an endotoxin of cellulose-digesting bacteria that inhabit the sea star's digestive glands D) injected into individual thorns by mutualistic corals which live on the aboral surfaces of these sea stars
At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?
A) Estrogen is produced in very large concentration and therefore diffuses widely. B) Estrogen has specific receptors inside several cell types, but each cell responds in the same way to its binding. C) Estrogen is kept away from the surface of any cells not able to bind it at the surface. D) Estrogen binds to specific receptors inside many kinds of cells, each of which have different responses to its binding. E) The subcomponents of estrogen, when metabolized, can influence cell response.