Which of the following serves to increase the surface area of a cell?
A. Microvilli
B. The nucleolus
C. Centrioles
D. Microfilaments
Answer: A
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What transport process can create a concentration gradient for sodium across the plasma membrane?
a. osmosis b. phagocytosis c. facilitated diffusion d. active transport e. passive diffusion
The cytoskeleton component composed mainly of the protein actin is a __________.
Fill in the blank(s) with the appropriate word(s).
During skeletal muscle contraction, ________.
A. Ca2+ associates with tropomyosin B. thin filaments slide across thick filaments C. the H band increases in size D. myosin heads interact with tropomyosin
________ molecules are compounds that contain carbon as the primary structural atom
A) Complex B) Inorganic C) Exergonic D) Endergonic E) Organic