It is generally thought that four critical innovations arose during the evolution of our ape-like ancestors into humans. All of the following are innovations except
a. use of brain power for abstract thought.
b. development of the opposable thumb.
c. expansion of the human brain.
d. toolmaking.
e. bipedalism.
B
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Which of the following structures or molecular machines is important for protein degradation in eukaryotes?
A. cytoskeleton B. flagellum C. ribosome D. ATP synthase E. proteasome
Plants respond to environmental stimuli by adjusting the growth of roots and shoots in hormone-mediated responses called ________
a. biological clocks b. circadian rhythms c. photoperiodism d. tropisms
Two of the divisions of the nervous system are nerves that control voluntary actions and nerves that control involuntary actions. These nerves are both found in the ________ nervous system
A) central B) somatic C) peripheral D) spinal
Rapid loss of blood may lead to shock and death. What series of events do the kidneys initiate to raise the blood pressure of a person who has been severely cut to prevent shock and subsequent death?
What will be an ideal response?