Mutations are _____________.
A.usually weeded out of a population.
B.usually neutral.
C.usually beneficial.
D.necessary for evolution.
E.usually detrimental.
D.necessary for evolution.
Rationale: Mutations are essential to evolution; they are the raw material of genetic variation. Without mutation, evolution could not occur.
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If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg, what will happen to the cell?
A. The cell will lose water and its osmotic pressure will decrease. B. The cell will gain water and its osmotic pressure will decrease. C. The cell will gain water and its osmotic pressure will increase. D. The cell will lose water and its osmotic pressure will increase.
Drugs that are HIV protease inhibitors
A. prevent HIV protease from degrading host cell proteins. B. block the translation of HIV proteases. C. bind to HIV proteases. D. prevent HIV proteases from breaking apart capsid proteins. E. both bind to HIV proteases and prevent them from breaking apart capsid proteins.
In the images below, which contains a disconformity?
Accessory pigments within chloroplasts are responsible for
a. driving the splitting of water molecules b. absorbing photons of different wavelengths of light c. providing electrons to the reaction center chlorophyll after electrons pass to NADP+ d. pumping H+create a proton gradient across the thylakoid membrane e. anchoring chlorophyll a within the reaction center