The gritty stone cells of pears and flax stem fibers

are examples of
a. xylem.
b. collenchyma.
c. phloem.
d. sclerenchyma.
e. parenchyma.


Answer: d

Biology & Microbiology

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Vascular cambium (wood) evolved independently in several different groups of vascular plants

A. true B. false

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Rhizarians play what important role in the environment?

a. nitrogen fixation in soils b. bioremediation after chemical accidents c. sequestration of carbon in their calcium carbonate shells d. decomposition

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The membrane potential of a neuron is defined

as the

a. measured capacity of a neuron to create an electrical impulse. b. voltage in the neuron plasma membrane. c. threshold potential of a neuron. d. the electric gradient across a neuron’s plasma membrane. e. amount of voltage it takes to stimulate a neuron to fire.

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Which of the following are inactivated by

ricin?

a. proteins b. ribosomes c. DNA d. transcription factors e. mRNA

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