Why are stem cells important?
A) They have specialized DNA.
B) They are incapable of becoming cancer cells.
C) They have the potential to undergo cell division.
D) They have the potential to develop into other cell types.
Ans: D) They have the potential to develop into other cell types.
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Which of the following is (are) true in plants? I) Mitosis occurs in gametophytes to produce gametes. II) Meiosis occurs in sporophytes to produce spores. III) The gametophyte is within the flower in angiosperms
A) only I B) only II C) only III D) only I and II E) I, II, and III
When a hurricane destroys a forest and kills many of the organisms living there, it is referred to as
A. an extrinsic limiting factor. B. a density-dependent limiting factor. C. an intrinsic limiting factor. D. None of these answers is correct.
Which of the following statements about antibiotic resistance in bacteria is NOT true?
A. The antibiotic resistance gene can be transmitted to bacteria via transformation or transduction. B. Environments where antibiotics are frequently used such as hospitals are under higher risk of giving rise to bacteria with antibiotic resistance. C. Antibiotic resistance cannot be conferred by conjugation as conjugation only affects the fertility of bacteria. D. Antibiotic resistance often originates from the microbes that produce antibiotics for their own survival. E. The plasmid containing the antibiotic resistance gene can pass the gene to genetically unrelated bacteria.
Membrane phospholipids
A) have hydrophobic heads that face the center of the membrane and are shielded from water. B) have hydrophilic tails that face outward and are exposed to water. C) are able to drift about in the plasma membrane. D) remain fluid because they are tightly packed against one another.