The brain knows how strong a stimulus is because the brain interprets ____
a. the neurotransmitter levels the stimulus is producing
b. variations in the frequency of action potentials
c. the size variation in the action potential being propagated
d. the number of ion channels in the plasma membrane of the sensory neuron
e. the extent to which voltage gated ion channels open and close
ANSWER: e
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Steroid hormones are large communication molecules that are modified cholesterol molecules. How do you think they enter a cell?
A) Their size probably allows them to diffuse through the plasma membrane. B) Their lipid nature probably allows them to diffuse through the plasma membrane. C) Their protein structure probably allows them to diffuse through the plasma membrane. D) They must require a protein transporter, because the plasma membrane is completely impermeable to molecules.
Which portion of the root allows it to sense water levels?
A. root endodermis B. root epidermis C. root hairs throughout the root D. root cap E. root vascular tissue
The method of gene therapy that would result in the transferred gene being passed onto offspring is known as ____________________
Fill in the blank(s) with correct word
The almost complete loss of the American chestnut tree to the chestnut blight fungus had ____ ecological impact on
the moderately diverse Appalachian woodlands of which it was formerly a part. a. little b. great c. moderate d. undetectable e. detectable