How many electron pairs are shared between carbon 2 and 3 in the accompanying figure?
a. one
b. one and a half
c. two
d. three
e. four
c
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Which of the following with regard to cancer cells is false ?
A) Growth is not regulated by growth factors. B) The cell cycle is disrupted. C) Most cancer cells die in G1 phase. D) Growth is not stopped by high levels of DNA damage. E) The apoptosis pathway is blocked.
Alveoli are surrounded by pulmonary capillaries
Indicate whether the statement is true or false.
Which statement about primate chromosomes is
false? a. Thirteen of twenty-three pairs of human chromosomes are nearly identical with chimpanzee and gorilla chromosomes. b. One human chromosome matches two chimp chromosomes. c. Inversions, translocations, and duplications may have contributed to differences among primates. d. Chimpanzees and gorillas have twenty-three pairs of chromosomes. e. During human evolution, two chromosomes permanently fused.
At the synapse, some neurotransmitters open ion channels that make the interior of the postsynaptic neuron more negative. Thus, these neurotransmitters produce a(n) ________ postsynaptic potential (IPSP)
A) enhancing B) decreasing C) excitatory D) inhibitory E) rewarding