Which of the following best describes the mechanism that causes stomata to open?
A) Water accumulates below the opening and eventually causes the stoma to open.
B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open.
C) Two guard cells flanking each stoma control its opening by changing shape.
D) The internal pressure of xylem sap expands the leaf, stretching the stoma open.
C
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Jacques Monod and François Jacob deduced the mechanism responsible for the regulation of bacterial gene expression. They are, therefore, responsible for launching the era of
A) the scientific method. B) molecular genetics. C) biochemistry. D) light microscopy. E) radioisotopes.
The interaction between two species in which both species are harmed is known as:
a. mutualism b. parasitism c. commensalism d. competition e. predation
Segmentation genes in Drosophila act in which of the following orders?
A) segmental, helical, spherical B) pair-rule, transdeterminal, gap genes C) gap, pair-rule, segment polarity D) pair-rule, segment polarity, gap genes E) pair-rule, segment polarity, Hox genes
"Bacterial transformation" is a bacterium's ability to:
A) produce restriction enzymes. B) connect DNA fragments once they are cut with restriction enzymes. C) produce proteins from another organism's genes. D) take up DNA from its surroundings.