Populations of the peppered moth provide an

example of __________ selection.
a. kin
b. disruptive
c. directional
d. stabilizing
e. artificial


Answer: c

Biology & Microbiology

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Which of the following are proteins that interact directly with antigens during the adaptive immune response?

A) immunoglobins B) major histocompatibility complex C) T cell receptors D) all of these

Biology & Microbiology

Which animal does a dolphin or whale most resemble as it swims through water?  

A.  A running lizard B.  A swimming shark C.  A swimming penguin D.  A swimming alligator E.  A running dog Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about how a whale swims? What other information is related to the question? Choose Answer · Given what you now know, what information 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?

Biology & Microbiology

If there was random mating and no evolution in the kangaroo rat population shown here, in the next generation if there were 1000 individuals, about how many dark brown kangaroo rats would you expect to see?

a) 24 b) 10 c) 218 d) 78 e) 2

Biology & Microbiology

How does the lipopolysaccharide from Neisseria differ from other Gram-negative bacteria?

A. it activates B cells B. It lacks endotoxin activity C. It is formed of a longer chain of polysaccharides D. it is formed of a shorter chain of polysaccharides

Biology & Microbiology