Describe the various functions of proteins in membranes
What will be an ideal response?
The different types of proteins in the plasma membrane may function as the following: (a) channels that allow the movement of specific ions or polar molecules down a concentration gradient; (b) carriers, which change shape to transport substances either down or up a concentration gradient; (c) docking-marker acceptors, which bind to secretory vesicles and trigger exocytosis; (d) membrane-bound enzymes that facilitate specific chemical reactions; (e) receptors, which bind to chemical messengers in the ECF and can then trigger reactions inside the cell; (e) cell adhesion molecules (CAMs) that can help hold adjacent cells together; and (f) cell-recognition markers that allow the body to recognize its own cells.
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Answer the following statement true (T) or false (F)
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A. Ghrelin and CCK B. Insulin and PYY C. Leptin and CCK D. Leptin and insulin
________ is a pigment found in vegetables that can make skin appear orange or yellow.
A) Carotene B) Melanin C) Sebum D) Cerumen E) Cyanosis
Which of the following statements correctly describes epithelial tissue?
A. Epithelial tissues allow for communication within the body by using electrical and chemical signals. B. Epithelial tissues cover and line all body surfaces including organs, vessels, and ducts. C. Epithelial tissues allow for movement of the body. D. Epithelial tissues have fibers in a matrix.