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Chapter 1: Q. 10 (page 7)
10. Which of the following is a water-soluble vitamin?
a. vitamin A
b. vitamin E
c. vitamin K
d. vitamin C
Option D is the correct answer
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Why are steroids able to diffuse across the plasma
membrane?
a. Their transport protein moves them through the
membrane.
b. They are amphipathic, allowing them to interact
with the entire phospholipid.
c. Cells express channels that let hormones flow down
their concentration gradient into the cells.
d. They are non-polar molecules.
For a neuron to fire an action potential, its membrane must reach ________.
a. hyperpolarization
b. the threshold of excitation
c. the refractory period
d. inhibitory postsynaptic potential
Why are the loop of Henle and vasa recta important for the formation of concentrated urine?
The gland located at the top of the kidney is the ________
gland.
a. adrenal
b. pituitary
c. thyroid
d. thymus
Compare and contrast the formation of urea and uric acid.
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