The hypothesis that mitochondria and chloroplasts evolved as a result of a close relationship with another cell is known as ________
a. endosymbiosis
b. thermodynamics
c. parasitism
d. the Big Bang theory
e. evolution
a
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When comparing DNA sequences of similar genes for proteins in related species, you see that some of the sequences are longer in one species compared to the other
Which of the following would most likely represent the extra number of bases that you would see? A. 5 B. 7 C. 17 D. 21 E. 25
Use the sum rule to determine the probability of either event X or event Y occurring if they cannot
occur simultaneously. (In the equations below, Px means probability of event X; Py means probability of event Y.)
a. = Px + Py b. = PxPy c. = (Px)2 + (Py)2 d. = (Px + Py)2 e. = Px 2Py 2
p53 is often referred to as the “guardian of the genome” by cancer research scientists. According to the diagram, which action by p53 explains its reputation?
a. Mutated p53 results in cancer.
b. p53 can trigger apoptosis.
c. p53 arrests the cell cycle if there is DNA damage.
d. p53 monitors the supply of oxygen in the environment.
The calcium-rich remains of protists are now found
a. in sea floor sediments. b. in limestone rock formations. c. in the white cliffs of Dover, England. d. in the Egyptian pyramids. e. in all of these places.