Variations in hair color reflect differences in the pigment produced by
A) keratinocytes.
B) melanocytes.
C) dermal papillae.
D) soft keratin.
E) carotene cells.
B
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Biliverdin and bilirubin are pigments that result from the breakdown of red blood cells. Biliverdin is ________ in color and bilirubin is ________ in color.
A. black; red B. greenish; purple C. greenish; orange D. brownish; orange
The term cellular (metabolic) energy indicates any biological process requiring
A) thermal energy and chemical energy. B) ATP. C) chemical energy. D) thermal energy. E) energy in any form.
A metabolic pathway is a particular sequence of enzyme-controlled reactions
Indicate whether the statement is true or false
Which of these is an example of active transport?
A. Facilitated diffusion of K+ B. Transport of Na+ from a place of low concentration to a place of higher concentration C. Diffusion of oxygen from a place of high concentration to a place of lower concentration D. Transport of Cl- following its concentration gradient E. Transport of glucose down its concentration gradient