Which birth control method is the most effective in protecting against sexually transmitted diseases?
a. abstinence
b. the Pill
c. condoms
d. an IUD
e. the rhythm method
ANSWER: a
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Which one of the following would be least likely to cross a lipid bilayer?
A. O2 B. CO2 C. ATP D. H2O E. N2
In a lotic system ____
a. there is no border between freshwater and terrestrial systems b. water stands in an open basin c. freshwater and marine systems intermix d. water flows through channels e. marshes predominate
You have identified an enzyme that appears to be involved in the addition of palmityl group (a fatty acid) to certain proteins. Knowing that palmitoylated proteins are usually targeted for delivery to the plasma membrane, in which organelles might this enzyme be expressed?
A. golgi apparatus and nucleus B. endoplasmic reticulum and nucleus C. endoplasmic reticulum and ribosomes D. golgi apparatus and endoplasmic reticulum
Which statement regarding exercise is true?
A) Most of the ATP for aerobic exercise comes from aerobic respiration. B) During a short burst of activity such as a sprint, the main source of energy is aerobic respiration. C) If the demand for ATP outstrips oxygen supply, muscles switch to aerobic fermentation.