In the process of blood clotting, platelets ____
a. engulf and digest cellular debris
b. release substances that repel more platelets
c. convert fibrin into fibrinogen
d. clump together
e. do nothing as they are not involved in clotting.
ANSWER: d
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A group of specialized cells of similar structure and function is a(n) ____
a. organ system b. cell cluster c. organ d. tissue e. organism
The sodium-potassium pump is used in
a. facilitated diffusion. b. simple diffusion. c. active transport. d. osmosis. e. bulk flow
An organic nutrient that cannot be synthesized by the organism and must be provided is called a(n) ________.
A. element B. macronutrient C. growth factor D. compound E. trace element
During translation, translocation refers to
A. moving the ribosome along the mRNA molecule. B. joining a tRNA molecule to the ribosome. C. releasing a tRNA molecule from the ribosome. D. joining an amino acid to the next amino acid in the chain. E. joining an amino acid to a tRNA molecule.