Octopuses and squids, like vertebrates, have
a. simple eyes.
b. ocelli.
c. ciliary eyes.
d. compound eyes.
e. “camera” eyes.
Answer: e
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A one-way relationship in which one species benefits at the expense of another is called ____
a. commensalism b. symbiosis c. parasitism d. mutualism e. interspecific competition
Which two molecular techniques are used in DNA profiling to generate data included in the FBI's CODIS database?
What will be an ideal response?
The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by _____
A) natural selection, because these traits evolved in the population over time B) natural selection, because these traits were not consciously selected by humans C) artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content D) artificial selection, because these animals differ from their close relatives and common ancestor
Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. What is the likely outcome of a deletion of the Rag genes?
A. Mild susceptibility to infection due to T cell defects B. Severe combined immunodeficiency (SCID) of both B and T cells C. Increased antibody diversity from B cells D. Increased resistance to infection due to enhanced B and T cell function