In humans, sex determination generally depends upon
a. whether or not the X chromosome is present.
b. the number of X chromosomes present.
c. environment in the womb.
d. whether or not the Y chromosome is present.
e. how many autosomes are present
D
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Endospores can resist
a. boiling water. b. acids. c. irradiation. d. disinfectants. e. all of these.
Which of the following statements is false?
a. Endotherms have a higher metabolic rate than ectotherms. b. Endotherms can regulate their temperature through behavior. c. Ectotherms regulate their temperatures through behavior. d. Heterotherms may function as either an ectotherm or an endotherm. e. Ectotherms do better in cold climates.
Why are hydrocarbons considered hydrophobic?
a. Hydrocarbons exist as isomers. b. Hydrocarbons contain oxygen atoms. c. The covalent bonds between carbon atoms are polar. d. The covalent bonds between hydrogen and carbon are nonpolar. e. The hydrogen bonds between hydrogen and carbon are nonpolar.
Integrins are glycoproteins that help link the cytoskeleton and the
A. cell wall. B. cytoplasm. C. extracellular matrix. D. ribosomes.