Kauai, the first of the big islands of the Hawaiian
Archipelago, rose from the sea more than _________
years ago.
a. 5 billion
b. 1 billion
c. 5 million
d. 1 million
e. 400,000
Answer: c
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India is in which demographic transitional stage?
a. birth and death rates equally high; growth rate low b. death rate dropping fast; birth rate declining but slowly c. birth rates declining and approaching the death rates d. birth rate falling below death rate; population size decreasing e. death rate greatly exceeds birth rate; population is close to extinction
Expansins are proteins that loosen up cell walls so cells can elongate. Auxin is thought to activate expansins by
A) aligning cellulose microfibrils. B) activating protons pumps to decrease pH in a section of the cell wall. C) depositing lignin molecules between cellulose fibrils. D) increasing turgor pressure. E) increasing pectin hydration.
The major histocompatibility complex is important in a T-cell's ability to:
A. recognize specific viruses. B. recognize self from nonself. C. recognize specific parasites. D. recognize specific bacteria.
One function of antibodies is to ________
A) deactivate defensive proteins B) stimulate the production of antigens C) phagocytose invading bacteria D) clump invader cells