A gene that produces a protein used in more than one biochemical pathway, or other trait, is a(n) gene.
A. dominant
B. recessive
C. pleiotropic
D. codominant
E. incomplete dominant
C. pleiotropic
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A 36-year-old emergency medical technician (EMT) is exposed to a patient with brucellosis. Blood cultures are drawn from the EMT and reported as negative after 1 week. Which of the following statements explains this discrepancy?
a. The blood culture system is most likely not correctly functioning. b. Brucella does not grow in the blood. c. The blood culture bottles are most likely expired. d. The blood should have been incubated for a minimum of 3 weeks.
A bundle of ____ extends from the base to the tip of a eukaryotic flagellum or cilium
a. microtubules b. microfilaments c. actin d. cytokeratin e. intermediate filaments
As environments change, poorly adapted organisms will not survive and reproduce; therefore, we can expect species
to disappear at some low rate, called the ____.
a. background extinction rate b. punctuated equilibrium c. rate of phyletic gradualism d. rate of adaptive radiation
e. mass extinction rateWhich of the following molecules was NOT present in the prebiotic environment?
a. methane (CH4) b. hydrogen sulfide (H2S) c. water (H20) d. ammonia (NH3) e. molecular oxygen (O2)