Active transport occurs ________ the concentration gradient across a cell membrane.
A. against
B. passively against
C. toward
D. away from
E. in between
Answer: A
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Which of the following tend to increase genetic variation in a population?
A. Gene flow. B. Population bottleneck. C. Nonrandom mating, resulting in inbreeding. D. Mutations, resulting in neutral variation. E. Founder effect, resulting in the decrease in allele frequency and results in inbreeding.
Approximately what fraction of flowering plants is polyploid?
a. 1% b. 10% c. 25% d. 50% e. 80%
Which of the following is NOT a characteristic of spirochetes?
A) possess an axial filament B) gram-negative C) helical shape D) easily observed with brightfield microscopy E) found in the human oral cavity
Which of the following statements is TRUE?
a) once a person reaches maturity, cell division stops unless it is to repair a wound
b) cell division in an adult signifies cancer
c) some specific cells throughout the body retain the ability to divide & replace themselves
d) growth continues on throughout life of an adult human