One hypothesis about the decline in cell numbers during death phase is that the cells aren't all dying but instead remain alive but unable to grow when cultured, at least temporarily. These are known as ________.
A. ghost cells
B. programmed death cells
C. death phase cells
D. viable but nonculturable cells
Answer: D
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The intermediate disturbance hypothesis posits which of the following?
a. Species richness is greatest in communities that experience infrequent moderate disturbances. b. Species richness is greatest in communities that experience high temperatures. c. Species richness is greatest in communities that experience frequent severe disturbances. d. Species richness is greatest in communities that experience frequent moderate disturbances. e. Species richness is greatest in communities that experience intense disturbances.
Which of these definitions of species best matches the biological species concept?
A) Members of the same species are whatever an expert says they are. B) Members of the same species are all genetically identical. C) Members of the same species are all morphologically similar. D) Members of the same species look almost exactly alike. E) Members of the same species can mate and produce fertile offspring.
Rhinovirus causes the common cold in humans and its genome is protected by a
a. capsule b. peptidoglycan wall c. plasma membrane d. nucleocapsid
Which statement(s) concerning root hairs is/are correct? Select all that apply.
A) Root hairs are tubular extensions of individual epidermal cells. B) A root hair is isolated from its epidermal cell with a cross wall. C) Root hairs generally live only a few days before being sloughed off. D) Root hairs help the plant to adhere to the soil but have role in the absorption of water and minerals. E) Root hairs are located in the zone of maturation of a root.