A behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured
The blood pH drops as carbon dioxide is released into the bloodstream. Which component of the homeostatic feedback system is responsible for deciding if the blood pH is far enough from normal that a response is necessary?
A) effector
B) sensor
C) integrator
D) assimilator
Answer: C
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What statement best summarizes the evolutionary history of eyes?
A. Development of light-sensing organs evolved once, but several eye structures evolved separately. B. Eyes evolved once and were slightly modified in different phyla. C. Eyes evolved separately in each phylum from an ancestor with no ability to detect light. D. Light-detection organs can develop with very little developmental constraint. 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 eyes? 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? 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?
In which of the following do the lightdependent
reactions of photosynthesis take place?
a. thylakoid membranes b. stroma c. the outermost membrane d. between the outermost and innermost membranes e. a combination of more than one of these
The breakup of Pangaea probably caused sympatric speciation in many animals.
a. true b. false
The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings
(BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked. Suppose a small number, say 15%, of the offspring are instead black-bodied with normal wings. This is most likely the result of: a. crossing-over. b. incomplete dominance. c. codominance. d. an error in meiosis.
e. mutation