Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the b-globin gene?
A. silent
B. missense
C. nonsense
D. frameshift
E. sense
B. missense
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Which statement is true?
a. Blood flows from areas of high hydrostatic pressure in the arterioles to low hydrostatic pressure in the arteries. b. Blood flows from areas of low hydrostatic pressure in the arterioles to high hydrostatic pressure in the arteries. c. Blood flows from areas of high hydrostatic pressure in the arteries to low hydrostatic pressure in the arterioles. d. Blood flows from areas of low hydrostatic pressure in the arteries to high hydrostatic pressure in the arterioles.
All mammals have mammary glands.
a. true b. false
Adjacent water molecules are connected by the ________.
A) sharing of electrons between the hydrogen of one water molecule and the oxygen of another water molecule
B) electrical attraction between the hydrogen of one water molecule and the oxygen of another water molecule
C) sharing of electrons between adjacent oxygen molecules
D) electrical attraction between the hydrogen atoms of adjacent water molecules
Most broad-spectrum antibiotics act by
A) inhibiting the synthesis of the cell wall. B) inhibiting protein synthesis. C) inhibiting nucleic acid synthesis. D) inhibiting metabolic pathways. E) disrupting the cytoplasmic membrane.