A person suffers a stroke due to a blood clot that reduces blood flow in the brain. She is unable to speak, but is able to
read and understand text. Which scenario best explains the damage caused by the stroke?
a. The cortex of the cerebellum was affected by the reduced blood flow.
b. The interruption in blood flow affected the corpus callosum.
c. The region of damage was responsible for integration of visual and auditory stimuli.
d. The reduced blood flow damaged Wernicke's area of the temporal lobe.
e. The reduced blood flow damaged Broca's area of the temporal lobe.
ANSWER: e
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Acetylcholine is a neurotransmitter that binds to receptors on skeletal muscle cells. The receptor-signal complex brings about a series of events that result in contraction of skeletal muscle
Venom from black widow spiders causes an explosive release of acetylcholine. What would that do to its victims? A) The victim's muscles would be unable to contract. B) The victim's muscles would be unable to relax. C) The victim's cell receptors would no longer be able to bind regulatory hormones. D) The victim's cell receptors would be able to bind regulatory hormones but at a rate greatly exceeding normal rates.
Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:
A. producing sufficient surface tension to overcome the pull of gravity. B. having a strong cohesive force and attaching to the surrounding vessel walls. C. storing heat and thus moving faster because of heat of vaporization. D. having an adhesive force, which allows them to attach to the vessel walls. E. being associated with hydrophobic molecules, which can result in upward movement.
The source and sink may change depending on a plant's needs
A. true B. false
Which of the following statements about angiosperm reproduction is true?
A. It is less efficient than gymnosperm reproduction and requires more pollen. B. Animal pollination requires more energy than wind pollination. C. The female gametophyte in angiosperms is larger than in gymnosperms. D. There are a diverse array of flower shapes and colors, largely related to the mode of pollination. E. Fruits reduce the success of dispersal because animals consume the seeds when eating the fruits.