The thick wall that separates the heart into a left and right half is the

a. septum.
b. myocardium.
c. pericardium.
d. endocardium.
e. chordae tendinae.


A

Biology & Microbiology

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Which is true of heterotrophs?

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Nerve impulses from the vestibular apparatus travel to reflex centers in the ____

a. spinal cord b. brain stem c. cerebral cortex d. hypothalamus e. thalamus

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Variation that does not alter the ability to survive and reproduce:a

is not possible with natural selection. b. reduces genetic polymorphism. c. is only possible for polygenic traits. d. is not part of the gene pool. e. is called neutral variation

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When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to

A. more possible products of the reaction B. more permanent binding through intimate total contact C. a greater supply of activation energy D. a great range of possible catalytic activities E. an induced fit

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