In a muscle contraction event, what causes the
release of calcium from its endoplasmic
reticulum?
a. the hydrolysis of ATP
b. the formation of ATP
c. the formation of the actin-myosin crossbridge
d. a signal from a motor neuron
e. the shortening of the sarcomere
D
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The intercellular concentration of three electrolytes is compared with the concentration of these electrolytes in fluid eliminated from the shark rectal gland as indicated in the table above
Based on this data, which of the following is a likely function of the rectal gland? A) The rectal gland eliminates metabolic waste. B) The rectal gland is able to concentrate Na+, K+, and Cl-. C) The rectal gland stores only anions. D) The rectal gland is the only site of osmoregulation in the shark.
Genes are composed of DNA sequences and are condensed into larger structures called:
a. DNA. b. proteins. c. chromosomes. d. lipids. e. cell membranes.
Four of the five answers listed below are true of hyperthyroidism. Select the exception
a. anxiety b. excessive water loss through urination c. irritability d. chronic fever e. protruding eyes
Four of these factors have played a part in the extinction of honeycreepers in Hawaii. Which one is the exception?
a. loss of habitat b. human activities c. imported species d. depletion of the ozone layer e. disease