Adaptive immune responses are directed at pathogen molecules called
A) antigens.
B) antibodies.
C) T-cell receptors.
D) PAMP.
Answer: A
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The recessive allele that causes phenylketonuria (PKU) is harmful, except when an infant's diet has appropriate levels of the amino acid phenylalanine. What maintains the presence of this harmful allele in a population's gene pool?
A) heterozygote advantage B) stabilizing selection C) diploidy D) balancing selection
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. Synthesis B. Primer annealing C. Denaturation D. Antibody binding Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the PCR technique? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Eukaryotic cells require oxygen to:
A) start glycolysis. B) perform fermentation. C) serve as an electron acceptor in the electron transport chain. D) breathe. E) enter the Krebs cycle as an intermediate.
The fertilization of an egg by a sperm produces a cell called a/an:
A) oocyte. B) ovum. C) gamete. D) zygote.