In order for a tumor cell to metastasize, which of the following would you expect to happen?
A. a decrease in cadherin expression and an
increase of integrin expression
B. an increase of cadherin expression and a
decrease in integrin expression
C. an increase in both cadherin and integrin
expression
D. a decrease in both cadherin and integrin
expression
A
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The major difference between aerobic and anaerobic respiration is the final electron acceptor at the end of the electron transport chain.
Answer the following statement true (T) or false (F)
Roger, who has Type I diabetes mellitus, forgot to take along his insulin on a fishing trip to a remote part of Alaska. It takes him three days to make it out of the wilderness to a hospital. What would be the most likely match to Roger's blood and urine profile once he reaches the hospital?
A. A B. B C. C D. D
In the southeastern U.S., two species of wild lettuce (Lactuca) do not usually form hybrids, because they bloom at different seasons. The means of isolation appears to be
A. prezygotic and mechanical. B. prezygotic and temporal. C. postzygotic and behavioral. D. postzygotic and ecological. E. prezygotic and geographical.
Despite the enormous amount of solar energy that plants are exposed to, photosynthesis is only able to transform about 1-2% of that energy into stored chemical energy. Which of the following contributes to this inefficiency?
A. the production of 2-phosphoglycolate B. the strong preference of rubisco for oxygen over carbon dioxide C. the presence of xanthophylls and other pigments besides chlorophyll in the thylakoid membrane D. the presence of two photosystems (I and II) in the thylakoid membrane that compete for high energy electrons