Sieve tubes are different from vessel elements because they ____.
A. do not have nuclei
B. are not connected to each other
C. are alive at maturity
D. conduct minerals
E. transport water
Answer: C
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During attachment of phage to E. coli, the phage
A. actively seek out the bacteria. B. randomly bump into the bacteria. C. attach to proteins or carbohydrates on the bacterial surface. D. attach to the bacterial RNA. E. randomly bump into the bacteria AND attach to proteins or carbohydrates on the bacterial surface.
The single most effective and practical way to prevent the spread of infection among patients is
A. placing patients in negative pressure rooms. B. attentiveness of health care providers and patients to hand washing. C. isolating patients in private rooms. D. wearing gloves, gowns, masks.
Johann Gregor Mendel’s work in genetics focused on traits that exhibit discontinuous variation. What kind of traits are these?
a. traits that are inherited in distinct patterns easily distinguishable among phenotypes b. traits that are controlled by many genes that each participate in subtle ways to produce a range of phenotypes c. traits that are controlled by individual genes that are “tempered” by neighboring genes to produce a range of phenotypes d. traits that are located physically close to each other on the same chromosome
Animals that feed on bacteria and fungi are called ________
Fill in the blank(s) with correct word