Due to well developed molecular tools and careful screening designs, functional genes can be isolated directly by isolation from the environment rather than cultivating the diverse species in a microbial community
Indicate whether the statement is true or false.
Answer: TRUE
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Antigen presentation by MHC class 1 proteins is a signal for:
A. secretion of antibodies by B cells. B. attack by cytotoxic T cells. C. activation of cytotoxic T cells by helper T cells. D. cytokine release by helper T cells.
Stephen is studying the regulation of heart rate during exercise in rats. What portion of the
brain is he studying?
a. brain stem b. cerebellum c. cerebrum d. sensory cortex
Control of rodent populations is important for preventing ________.
A. brucellosis B. malaria C. plague D. Q fever
For a pathogen to cause an infection, which of the following must be present?
a. There must be an open wound in the skin. b. The host must be able to fight off the infection. c. If the pathogen must be very strong. d. The pathogen must be able to resist the defenses of the host.