The net movement of substances to regions of lower concentration is called
A. facilitation.
B. active transport.
C. diffusion.
D. osmosis.
Answer: C
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Which of the following is a characteristic of whisk ferns?
a. yellow knobs on branch tips b. deep, branching roots c. large, fringed fronds d. reddish-brown sporophytes
Most of the oxygen found in the blood is ____
a. bound to hemoglobin b. dissolved in the plasma c. dissolved in platelets d. bound to albumin e. bound to copper
Which of the following is a modified fatty acid?
a. prostaglandin b. cyclic AMP c. thyroid hormone d. epinephrine e. melatonin
When phospholipid molecules are placed in water
A. the hydrophobic ends of the molecules exclude water from their surroundings. B. hydrophilic fatty acid ends mix well with the water. C. a single-layered membrane is formed. D. All of the choices occur.