Imagine an insect that is making its way from the outside of a tree to the inside of the tree. Put the layers that it would it encounter in order, starting with the outermost later.____primary xylem and pith____cork cambium____remains of primary and older secondary phloem____cork____secondary xylem
What will be an ideal response?
| 5 | primary xylem and pith |
| 2 | cork cambium |
| 3 | remains of primary and older secondary phloem |
| 1 | cork |
| 4 | secondary xylem |
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Cells that can detect and respond to a hormone are known as
a. target cells. b. regulator cells. c. receptor cells. d. messenger cells. e. endocrine cells.
The significance of the Griffith, Avery, and Hershey-Chase experiments was that they demonstrated that
A. genes were located on chromosomes. B. DNA was the molecule of heredity. C. proteins were what genes were composed of. D. enzymes transformed bacteria.
Which of the following statements is false?
a. Enzymes catalyze reversible reactions in either direction. b. Enzymes are highly specific. c. Most enzymes are protein molecules. d. Enzymes allow some reactions to occur that would never occur without them. e. Enzymes may be temporarily modified during their involvement with the substrate.
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500, and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, hawk: 300). How many rabbits, per day, does it take to support the hawk?
A. about 1/2 a rabbit B. approximately 6 C. 2 whole rabbits D. 12 rabbits