How did scientists determine that the shoot apical meristem (SAM) is genetically controlled?

A. They used Arabidopsis because its entire genome is known.
B. They used a dwarf Arabidopsis that has a dwarf meristem.
C. They discovered that the central zone cells of Arabidopsis do not function normally.
D. They discovered that the central zone cells of Arabidopsis differentiate very quickly.
E. Arabidopsis was not involved in this study.


A. They used Arabidopsis because its entire genome is known.

Biology & Microbiology

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Antimicrobial resistance resulting from the normal genetic, structural, or physiologic state of a microorganism is referred to as ________ resistance

a. intrinsic b. inherent c. microorganism-mediated d. clinical

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Members of the phyla Ectoprocta, Brachipoda, and Phoronida all possess a lophophore, which is

a. a cluster of pores along the aboral surface, used for expelling wastes from the digestive tract. b. a hard shell made of calcium carbonate. c. an outpocket of the digestive tract, where metabolic wastes are processed before emptying into the digestive tract for expulsion. d. a circular fold with one or two rows of hollow, ciliated tentacles. e. an extra body cavity surrounding the digestive tract filled with muscles used for locomotion.

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What gram-positive organisms are the smallest living cells?

a. actinomycetes b. halophiles c. prions d. mycoplasmas e. cyanobacteria

Biology & Microbiology

When the predator population is below the prey isocline, the prey population is

a. increasing b. decreasing c. neither increasing nor decreasing

Biology & Microbiology