What process(es) are required for phospholipids to flip-flop across the lipid bilayer?
A. The process requires energy.
B. The process occurs spontaneously, requiring no energy.
C. The process requires an enzyme called flippase.
D. The process requires energy and the flippase enzyme.
E. The process occurs spontaneously and requires the flippase enzyme.
D. The process requires energy and the flippase enzyme.
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All steroids have
a. the same number of double bonds. b. one or more fatty acids. c. four rings of carbon to which other atoms are attached. d. the same functional groups. e. the same number and positions of double bonds.
The bulk of the herbaceous plant's body is its ____ system
a. vascular tissue b. ground tissue c. dermal tissue d. xylem tissue e. meristematic tissue
____ functions as a container or way to package substances in the cell.
A. Chloroplast B. Chromosome C. Vesicle D. Ribosome E. Centriole
Which of the following statements about eosinophil function is CORRECT?
A) They produce defensins. B) They secrete toxins onto virally infected cells. C) They are involved in the removal of neoplastic cells. D) They attach to the surface of parasitic helminths and produce toxins that kill the parasite. E) They identify and spare normal cells.