How are Gram-positive and Gram-negative flagella different?
a. Flagella are only found in Gram-negative bacteria.
b. A Gram-positive flagellum has only two rings in its basal body; Gram-negatives each have four.
c. A Gram-positive flagellum does not have a membrane covering its filament; A Gram-negative flagellum does.
d. Each Gram-positive flagellum contains a hook; gram-negatives do not.
Answer: b. A Gram-positive flagellum has only two rings in its basal body; Gram-negatives each have four.
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Gay matter is located in the ____ of the cerebrum
a. outer region b. inner region c. ventricle d. right, but not left, hemisphere e. left, but not right, hemisphere
Sexual reproduction _____
A) allows animals to conserve resources and reproduce only during optimal conditions B) can produce diverse phenotypes that may enhance survival of a population in a changing environment C) enables males and females to remain isolated from each other while rapidly colonizing habitats D) guarantees that both parents will provide care for each offspring
Clinicians should always be notified of "panic values," that is, potentially life-threatening results. An example of a panic value is a(n):
a. elevated thyroid level. b. positive urine culture. c. positive blood culture. d. elevated sodium level.
Coexisting species of wild cats differ in the size of their canine teeth, which corresponds to differences in their preferred species of prey. This outcome is most likely the result of
A) resource partitioning. B) ecological release. C) competitive exclusion. D) preemptive competition.