Other than abstinence and sterilization, the most effective method of contraception is the
A) diaphragm.
B) contraceptive sponge.
C) birth control pill.
D) IUD.
E) condom.
C
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Enveloped viruses may enter their host cells by fusion of their envelope with the cytoplasmic membrane, thereby depositing their nucleocapsid within the cell.
Answer the following statement true (T) or false (F)
When pollen from one species lands on the stigma of a flower from another species
a. the pollen tube typically does not develop. b. the pollen tube typically forms, but the sperm cannot penetrate the egg. c. the pollen tube typically forms and grows to the ovary, but then stops. d. the pollen tube typically forms, but the sperm are killed. e. the pollen tube typically forms and the egg is usually fertilized, but the embryo rarely grows.
Beta interferon is used to treat
a. herpes infections. b. multiple sclerosis. c. measles. d. mumps. e. hepatitis C.
The shorter the wavelength of a radiation source, the greater its likelihood of causing damage
Indicate whether the statement is true or false