Lipid rafts are
A) regions of the membrane that are high in sphingolipids, which facilitate communication with the external environment of the cell.
B) important regions of membrane structure and are comprised of phospholipids.
C) regions not typically associated with signal transduction.
D) regions where greater concentrations of sphingolipids are on the inner side of the membrane.
E) great for white-water rafting.
A) regions of the membrane that are high in sphingolipids, which facilitate communication with the external environment of the cell.
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All of the following statements about cellular trafficking are true except
A) COPII-coated vesicles move materials from ER to Golgi. B) COPI-coated vesicles move materials from Golgi to the secretory vesicle. C) movement may be mediated by microtubules. D) v-SNAREs occur in vesicles; t-SNAREs occur on target sites. E) tethering proteins mediate docking between target and vesicle.
Each of the following affect cell walls, except ________.
A. cephalosporin B. penicillin C. cycloserine D. vancomycin E. erythromycin
The pancreas produces hormones that regulate
___ homeostasis.
a. water b. temperature c. pH d. glucose e. several types of
Which of the following is NOT a checkpoint that controls the progression of the cell cycle?
A. The metaphase checkpoint determines if all chromosomes are attached to the spindle apparatus. B. The restriction point determines if conditions are favorable for cell division and if the DNA is undamaged. C. The G2 checkpoint checks for DNA damage and determines if all of the DNA is replicated. D. Cyclins and cyclin-dependent kinases are proteins that are responsible for advancing a cell through the phases of the cell cycle. E. Cytokinesis involves the formation of cleavage furrow to separate the cells.