In the process known as __________, the fate of a cell is influenced by interactions with neighboring
cells.
a. determination
b. induction
c. apoptosis
d. differentiation
e. pleiotropy
B
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Spore germination followed by cell divisions results in the production of
(a) a sporophyte. (b) an antheridium. (c) a zygote. (d) a gametophyte.
After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced in warmer times decayed and released carbon dioxide. B. There was an increase in aerobic bacteria that released large amounts of carbon dioxide. C. There was an increase in oxygen that stimulated respiration and hence greater production of carbon dioxide. D. The low carbon dioxide levels caused cooling of the Earth, resulting in the decline of ancient vegetation; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. All of the other choices provided are incorrect.
Which of the following would be true if a toxin that blocks voltage-gated Ca2+ channels was applied to a neuron?
A. No resting membrane potential would be observed (i.e., measures at 0 mV). B. A rapid increase in membrane potential at threshold voltage would not occur. C. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterwards. D. The neuron would become hyperpolarized. E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
Ventilation includes
A. expiration. B. illumination. C. inspiration. D. All of these are correct. E. Both inspiration and expiration.