One strategy used by dissimilatory metal-reducing bacteria that enable their use of insoluble compounds as electron acceptors is to localize cytochromes in the outer membrane, rather than the plasma membrane to enable the direct transfer of electrons from cytochromes to the extracellular metal.
Answer the following statement true (T) or false (F)
True
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Clonal selection implies that _____
A) brothers and sisters have similar immune responses B) antigens increase mitosis in specific lymphocytes C) only certain cells can produce interferon D) a B cell has multiple types of antigen receptors E) the body selects which antigens it will respond to
The morning-after pill works by ____
a. blocking ovulation or fertilization b. blocking passage of sperm through the female reproductive tract c. blocking passage of sperm through the male reproductive tract d. causing shedding of the endometrial lining and any implanted embryo e. increasing the effectiveness of the acrosomal reaction
The number of individuals of the same species in some specified area or volume of habitat is the ____
a. population density b. population growth c. population birth rate d. population size e. carrying capacity
The difference between a population and a community in the same location is that
A. a community is an isolated subpopulation of a larger population of a species. B. a population includes members of one species, while a community includes its nonliving environmental resources. C. a population includes all the living organisms, while a community is the physical location in which they live. D. a community includes members of one species, while a population includes multiple species. E. a population includes members of one species, while a community includes populations of multiple species.