In order to view a specimen with a total magnification of 400×, a ________ objective must be used if the ocular is 10×.
Fill in the blank(s) with the appropriate word(s).
40×
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Which of the following is TRUE of both T cells and B cells?
A. They are lymphocytes. B. They recognize specific antigens on the cell surface. C. They have class I MHC molecules on their cell surface. D. They are involved in the humoral immune response. E. All of the responses are correct.
People who are heterozygous with just one copy of an allele for a recessive disorder do not show symptoms of the disorder. They are considered to be _________ of the disorder.
Fill in the blank(s) with the appropriate word(s).
When you look at a picture of a dog and then correctly identify it, what have you done in your conscious mind?
A) proprioception B) perception C) photoreception D) podsolization
Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
A. The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. B. Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake. C. Speciation of the Lake Victoria cichlids was mainly sympatric. D. The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. E. The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years.