Which of the following glands produces melatonin, the hormones that regulates sleep?
a) thyroid
b) hypothalamus
c) pituitary
d) pineal
Ans: d) pineal
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Photosynthesis must provide a source of electrons and H+ ions because ______________
a. atmospheric CO2 must be oxidized by adding electrons b. CO2 must be reduced to produce sugars c. hydrogen atoms are added to oxygen to form water d. hydrogen ions and electrons react to produce hydrogen gas e. hydrogen ions and electrons are converted into oxygen gas
During a muscle contraction, electrical impulses travel to the interior of the cell through ____
a. T-tubules b. endoplasmic reticulum c. troponin d. tropomyosin e. sarcoplasmic reticulum
As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands?
A. DNA endonuclease B. DNA polymerase C. DNA exonuclease D. DNA ligase E. DNA gyrase
In a reflex such as the "knee jerk" or patellar reflex, the efferent signal travels through the:
A) spinal cord. B) sensory neuron. C) interneuron. D) motor neuron.