What is wood?
a. secondary xylem that has accumulated outside a cylinder of vascular cambium
b. secondary xylem that has accumulated inside a cylinder of vascular cambium
c. primary xylem that has accumulated outside a cylinder of vascular cambium
d. primary xylem that has accumulated inside a cylinder of vascular cambium
e. vascular cambium cells
ANSWER: b
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Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?
A. ATP can be used by cells to drive endergonic reactions B. ATP can be used to make RNA, which is an energy storage molecule in the cell C. ATP synthesis is an exergonic reaction D. ATP is required to generate the proton gradient in the intermembrane space of mitochondria
Which regulatory mechanism does NOT depend on a conformational change in protein/enzyme structure to change activity?
A) attenuation B) catabolite repression C) feedback inhibition D) negative control
In the Meselson-Stahl experiment, DNA containing one heavy and one light strand was observed after
one generation of growth in media containing light nitrogen. If they had not allowed a second generation of growth, what would these scientists have been able to conclude?
What will be an ideal response?When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other, the type of cleavage is called
A. spiral cleavage. B. radial cleavage. C. indirect cleavage. D. protostome cleavage. E. direct cleavage.