Which of the following statements is TRUE of restriction enzymes?
A. they are not naturally produced by bacteria, but are bioengineered by humans.
B. they protect bacterial cells from invasion by foreign DNA.
C. they cut at random sites within a genome.
D. they cleave DNA only at sites of adjacent thymine bases.
E. there are less than 10 restriction enzymes known.
B. they protect bacterial cells from invasion by foreign DNA.
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A fire has swept through a mature forest and devastated the area. Virtually all vegetation is burned and considered a complete loss. Foresters, however, realize that plants will soon colonize the area starting the successional process that will eventually restore the forest. Will the pioneer plants that first colonize the area most likely be r-selection strategists or K-selection strategists?
Explain your answer. What will be an ideal response?
Which of the following statements about the graph is true?
A. Oysters live longer than Hydra.
B. Hydra and humans have parallel life spans.
C. Humans and oysters have similar life spans.
D. Humans have low mortality rates early in life.
E. Oysters have high mortality rates late in life.
Clarify question:
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content:
What do you already know about the characteristics of the three survivorship curves? What other information is related to the question?
Choose Answer:
Given what you now know, what information is most likely to produce the correct answer?
Reflection on Process:
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Drug addiction
a. is a form of chemical dependence. b. may result from habituation and increased tolerance. c. may result in deterioration of personal and professional relationships. d. may result in risk taking to obtain or use the drug e. includes all of these
Which of the following are highly distensible reservoirs for blood volume?
a. arteries b. arterioles c. capillaries d. venules e. veins