Discuss two hypotheses that attempt to explain the high species richness in the tropics
What will be an ideal response?
An ecological hypothesis is based on the fact that tropical regions experience abiotic conditions that
provide long and predictable growing seasons. Plants flourish in this environment, which then supports
a rich assemblage of herbivores. The rich assemblage of herbivores then supports many carnivores and
parasites. A historical hypothesis is based on the assumption that the tropical climate is benign. A
benign environment decreases extinction rates and allows organisms to have more generation per year,
which results in high speciation rates.
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Which of the following organisms would be likely to use the least energy per kilogram of body weight to maintain its temperature in a preferred range?
a. a whale in the Arctic Ocean b. a clam remaining submerged at low tide c. a tuna swimming in the deep ocean d. a lizard in a desert environment e. a human in a tropical environment
Which of the following is true for the mechanism of the 2Na+/glucose symporter?
A) Binding of 2 Na+ to the symporter open to the outside of the cell allows a glucose molecule outside the cell to bind. B) Binding of Na+ and glucose causes the symporter to open to the inside of the cell. C) Release of 2 Na+ ions to the inside of the cells causes release of the glucose molecule. D) Binding of 2 Na+ to the symporter on the inside of the cell causes the symporter to open to the outside of the cell and release of the Na+ ions. E) All of the above are steps in the mechanism.
Cellulose serves what function in organization?
When a UTI spreads to the kidneys it is called (cystitis/pyelonephritis/urethritis).
Fill in the blank(s) with the appropriate word(s).