Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants, and in exchange, the bacteria obtain food from the plants. Which type of interaction is this?
A. mutualism
B. commensalism
C. parasitism
D. predation
E. herbivory
Ans: A. mutualism
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Misfolding of polypeptides is a serious problem in cells. Which of the following diseases are associated with an accumulation of misfolded polypeptides?
A) Alzheimer's only B) Parkinson's only C) diabetes mellitus only D) Alzheimer's and Parkinson's only E) Alzheimer's, Parkinson's, and diabetes mellitus
The process of germination begins with ____
a. one sperm cell fusing with an egg b. one sperm cell fusing with the endosperm mother cell c. pollen landing on a stigma d. water soaking into soil e. water seeping into a seed
All of the populations of different species that
occupy and are adapted to a given area are a. the biosphere. b. a community. c. an ecosystem. d. a niche. e. an ecotone
When a viral genome is integrated into the host chromosome but does not result in the lysis of the host cell, the condition is referred to as ________.
A. a virulent infection B. a lytic infection C. temperate infection D. lysogeny