Sodium-potassium pumps increase the charge gradient across the neuron membrane by moving ________
a. one potassium ion into the cell and one sodium ion out
b. two potassium ions into the cell and three sodium ions out
c. three potassium ions into the cell and two sodium ions out
d. two potassium ions and three sodium ions out of the cell
b
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Which of the following statements is a testable scientific hypothesis?
A) Antioxidants from food are better than antioxidants from a vitamin pill. B) Eating fish reduces the chance of having a stroke. C) Embryonic stem cell research will allow scientists to find a cure for diabetes. D) Smoking makes people less attractive.
Molecules that absorb light are called
A. enzymes. B. pigments. C. photosynthesizers. D. electron carriers. E. absorbers.
People who undergo radiation therapy sometimes develop anemia resulting from a decreased production of red blood
cells. This is because radiation affects:a. spongy bone. b. osteoblasts. c. osteoclasts. d. lacunae. e. metaphysis.
If the epithelium that lines the air sacs of your lungs were to gain a layer of cells, which of the following would likely occur to the rate of oxygen diffusion?
A) Oxygen will diffuse across the lung surface more quickly. B) Oxygen will diffuse across the lung surface more slowly. C) Oxygen will diffuse across the lung surface out of, instead of into, the body. D) Oxygen will diffuse across the lung surface at a normal rate because it is only the shape of the cells that affect diffusion rate.