Protists are
a. autotrophic.
b. heterotrophic.
c. unicellular.
d. multicellular.
e. all of these.
E
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The embedded peptides in MHC proteins are normally derived from breakdown products of cell metabolism
Indicate whether the statement is true or false.
In Thomas Hunt Morgan's experiments, the ratio of red-eyed flies to white-eyed flies appeared to follow a simple Mendelian pattern of inheritance. What observation(s) did he make that led to his conclusion that the white-eyed trait was actually not a simple Mendelian trait?
A. He was able to correlate the expression of white eyes to the inheritance of an X chromosome. B. He saw that only males had white eyes. C. He observed that the white-eyed trait was recessive. D. He was able to correlate the expression of white eyes to the inheritance of a Y chromosome because only F2 males had white eyes and the trait is recessive. E. He was able to correlate the expression of white eyes to the inheritance of an X chromosome because only F2 males had white eyes and the trait is recessive.
Lymph nodes enlarge during an infection because
a. they become infected. b. lymphocytes destroy invaders inside of them. c. they become clogged due to infections in the blood. d. the body produces double the amount of lymph. e. blood oozes into the nodes.
According to MacArthur and Wilson's hypothesis of island biogeography, species immigration and extinction rates on a particular island correlate to:
a. the island's size and distance from the mainland b. the island's stage of ecological succession c. the number of other islands in their archipelago d. how the island formed