Which of the following statements is TRUE of membrane phospholipids?
A. The hydrophilic head groups face the interior portion of the membrane.
B. The hydrophobic tail groups face the exterior portion of the membrane.
C. They spontaneously flip-flop from one side of the membrane to the other.
D. They freely move laterally within the membrane.
E. They rarely flip-flop across or move laterally within the membrane.
D. They freely move laterally within the membrane.
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Plants, fungi and bacterial all have:
A. nuclei B. cell walls C. chloroplasts D. lysosomes E. mitochondria
Blood pH is kept near a value of 7.3 - 7.5 because of
a. salts. b. buffers. c. acids. d. bases. e. water.
Identify and briefly discuss two ecological roles filled by bacteria. What will be an ideal response?
You have a friend who lost 7 kg (about 15 pounds) of fat on a "low carb" diet. How did the fat leave her body?
A) It was released as CO2 and H2O. B) Chemical energy was converted to heat and then released. C) It was converted to ATP, which weighs much less than fat. D) It was broken down to amino acids and eliminated from the body. E) It was converted to urine and eliminated from the body.