The blue color of superficial blood vessels results from
A. an increase in arterial blood circulating in the area.
B. a lack of melanin in the area.
C. the light-scattering properties of collagen.
D. the superficial location of skin pigments.
E. a lack of oxygen in the blood.
Answer: C
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This type of membrane protein extends all the way through the cell membrane into both the extra- and intracellular fluids: ________.
Fill in the blank(s) with the appropriate word(s).
Peroxisomes form ________ from molecular oxygen and the hydrogen atoms stripped from the toxic molecule
Fill in the blank(s) with correct word
When an infection is present in the body the lymph nodes may _____.
a. contract b. swell c. produce more lymph d. increase immunity
Which of the following would NOT diffuse through the plasma membrane by means of simple diffusion?
A. A lipid-soluble vitamin B. Glucose C. Oxygen D. A steroid hormone