When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Contributing most directly to this phenomenon is
A. the lack of calcium to bind to troponin.
B. the lack of ATP to break cross-bridges between thick and thin filaments.
C. the absence of an oxygen supply to muscle.
D. the inability to synthesize actin and myosin.
B. the lack of ATP to break cross-bridges between thick and thin filaments.
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Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:
A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory
The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about cladistics?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect 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?
The action of a new drug is unknown, so you test various aspects of eukaryotic cell processes looking for an effect. You notice that the survival of cells exposed to this drug is very low. Further analysis shows that some proteins and mRNAs are much longer than they should be. One hypothesis is that the drug interferes with
A) transcription termination signals. B) spliceosome activity. C) ribosomes. D) nucleoli. E) both choices A and B
As John walked outside the ballpark, a foul ball sailed over the fence and came straight at him. He saw it, and before he could think of what to do, he had reflexively jumped out of the way. What part of the brain saved John from a nasty bump?
A) hypothalamus B) medulla oblongata C) pons D) midbrain