Match the membrane protein with its function.
1. structural proteins
2. enzymes
3. receptors
4. transporters
A. transfer signals from the extracellular environment to the cytoplasm of the cell
B. form cell-to-cell connections
C. bind to molecules to facilitate entry to or exit from the cell
D. ligands bind to these proteins and are changed by the protein
1. B. form cell-to-cell connections
2. D. ligands bind to these proteins and are changed by the protein
3. A. transfer signals from the extracellular environment to the cytoplasm of the cell
4. C. bind to molecules to facilitate entry to or exit from the cell
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As a runner sprints down a track, her movement is an example of
A. potential energy. B. mechanical energy. C. heat. D. radiant energy. E. chemical energy.
The heart is confined within a double-walled serous membrane sac. The part of the membrane that is in contact with the heart is the ________ layer.
A. serous B. synovial C. parietal D. mesothelial E. visceral
What is the first part of the cell that is affected when the pH of extracellular fluid changes?
A) the nucleus B) the nucleolus C) the cytosol D) the plasma membrane E) the cytoskeleton
Cells of the body mainly use __________ for the selective endocytosis of most macromolecules.
a) receptor-mediated endocytosis b) diffusion c) fluid-phase endocytosis d) pinocytosis