Hyaline cartilage is found in
a. intervertebral discs.
b. the outer flaps of the ears.
c. adipose tissue.
d. the trachea.
e. in the knee joint.
D
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Which hormone might be able to counteract the leaf drop caused by leaking street lanterns observed by Dimitry Neljubov?
A. Ethylene. B. Cytokinins. C. Gibberellins. D. Brassinosteroids.
Cigarette smoking causes cancer due to the
A) effects they have on our breathing mechanisms. B) chemical compounds in the smoke. C) fact that the chemical compounds are resistant to human immune systems. D) immunosuppressive effects they display.
Why must tropomyosin cover the thin filament in just the right position before the muscle can relax?
A) It is needed in the proper location, or ATP cannot be used. B) It covers the myosin-binding sites and, if left exposed, will allow the myosin to bind and pull. C) Without tropomyosin in the correct position, calcium cannot be released. D) It has a particular binding place that facilitates the removal of calcium.
Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?
A) 75 percent B) 50 percent C) 25 percent D) 0 percent E) 100 percent