If the DNA in a cell consists of 20% adenine, it will also have _____ thymine.
A. 30%
B. 80%
C. 40%
D. 20%
E. 10%
D. 20%
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The seeds of many plant species are dispersed by a harmless temporary attachment to an animal's fur or feathers. This form of dispersal is known as
A. ectoparasitism. B. amensalism. C. mutualism. D. phoresy. E. trophic mutualism.
If a physician hears abnormal heart sounds while examining a patient with a stethoscope, this would most likely indicate a problem with
a. the firing of the sinoatrial node. b. the contraction of the heart muscle. c. the function of the heart valves. d. the electrical signal from the muscles of the ventricles. e. the flow of blood into the atria.
Net photosynthesis is equal to
A) photosynthesis + respiration. B) photosynthesis - respiration. C) photosynthesis x respiration. D) photosynthesis / respiration.
Which of the following statements about the neocortex is false?
a. specialized cerebral cortex b. association area c. extensive in mammals d. found to some extent in all vertebrates e. responsible for higher learning