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
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Vascular cambium (wood) evolved independently in several different groups of vascular plants
A. true B. false
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
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.
Which of the following are inactivated by
ricin?
a. proteins b. ribosomes c. DNA d. transcription factors e. mRNA