In order for a cell to receive a signal, it must possess an appropriate ____
a. glycolipid
b. glycoprotein
c. receptor
d. transfer protein
e. hormone
C
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The initial depolarization associated with the action potential is the consequence of the opening of _________________ at the axon hillock
A. voltage-gated potassium channels B. voltage-gated calcium channels C. voltage-gated sodium channels D. voltage-gated chloride channels
Which event occurs in a human fetus with the XX combination of sex chromosomes?
a. Anti-Müllerian hormone is produced. b. The SRY gene is activated. c. Testosterone is secreted. d. The Wolffian ducts develop. e. The gonads develop into ovaries.
Plant community structure along an environmental gradient can often be explained by
A) differences among species in their competitive abilities. B) differences among species in their abilities to tolerate stress. C) differences among species in their resistance to herbivores. D) a trade-off among species with respect to competitive ability and stress tolerance.
Where in a cell does glycolysis occur?
A. Cytoplasm B. Golgi body C. Nucleoid D. Mitochondrion E. Rough endoplasmic reticulum