Contraceptive pills work by
A. preventing ovulation.
B. preventing sperm from entering the fallopian tubes.
C. creating an acidic environment in the uterus in which sperm cannot survive.
D. speeding the onset of menopause.
A. preventing ovulation.
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Which level of protein structure do the ?-helix and the ?-pleated sheet represent?
A) primary B) secondary C) tertiary D) quaternary E) primary, secondary, tertiary, and quaternary
Mutations in structural genes account for almost all of the differences that we observe among different species
A. true B. false
Which is true of heterotrophs?
A) They capture light energy. B) They cannot be unicellular. C) They store energy in the form of heat. D) They can function as autotrophs in an emergency. E) They can obtain energy from consuming phototrophs.
The nucleus of a cell
A) is surrounded by a single layer of membrane. B) is contained within the nucleolus. C) contains DNA. D) is the primary location of protein synthesis.