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A type of lipid that is prevalent in animals but occurs very little in plants is ___ . cholesterol B. isoprene C. squalene 2.
1. A type of lipid that is prevalent in animals but occurs very little in plants is ___ .
A. cholesterol B. isoprene C. squalene
2. When correctly matching three different structures to their names (cholesterol vs. estradiol vs. testosterone), the structure with a carbonyl group is
A. testosterone B. estradiol C. cholesterol
3. Dolichol, ubiquinone (coenzyme Q), and retinal are three lipids derived from isoprene. The lipid involved in the electron transport chain is ___ .
A. dolichol B. ubiquinone C. retinal
4. Farnese and squalene are isoprene derivatives containing ___ or ___ isoprene units respectively.
A. 2 (farnesene) ; 3 (squalene) B. 3 (farnesene) ; 2 (squalene) C. 6 (farnesene) ; 3 (squalene) D. 3 (farnesene) ; 6 (squalene)
5. We have seen examples where fatty acids are covalently linked to all of the following EXCEPT ___ .
A. isoprene B. glycerol
6. Glucose permease ___ the equilibrium ratio I/O for glucose located on the inside (I) vs. outside (O) of cells.
A. increases B. decreases C. does not affect
7. Glycophorin is a transmembrane protein found in the plasma membrane of erythrocytes. Carbohydrates are attached to it at residues located ___ .
A. on the extracellular surface B. in the transmembrane segment C. on the cytoplasmic surface
8. Which of the lipids below is NOT derived from isoprene?
A. cholesterol B. dolichol C. coenzyme Q D. farnesene E. palmitate
9. Which of the two membranes below has the greater variety of different proteins?
A. outer membrane of vertebrate retina rod cells B. mitochondrial inner plasma membrane
10. Sites of O-linked sugars in glycoproteins include ___
A. asn and gln B. ser and thr C. lys and arg
11. A protein which is loosely attached to the outside of a membrane is called a(an)
A. peripheral membrane protein B. integral membrane protein C. transmembrane protein
12. The dominant type of secondary structures in porin and bacteriorhodopsin are ___ and ___ respectively.
A. sheet (porin) ; sheet (bacteriorhodopsin) B. helices (porin) ; helices (bacteriorhodopsin) C. sheet (porin) ; helices (bacteriorhodopsin) D. helices (porin) ; sheet (bacteriorhodopsin)
13. Which of the types of human cells listed below contains only the outer plasma membrane and no nuclear membrane or other organelle membrane?
A. muscle cell (myocyte) B. mature red blood cell (erythrocyte) C. liver cell (hepatocyte) D. fat cell (adipocyte)
14. In the visual cycle, light causes
A. a dissociation of rhodopsin into opsin (the protein) and cis-retinal (the pigment). B. an oxidation/reduction reaction involving conversions between the aldehyde form retinal and the alcohol form retinol. C. cis-retinal to isomerize to trans-retinal
15. A dietary precursor for vitamin A is ___ .
A. dolichol B. ubiquinone C. beta-carotene
1. A. cholesterol2. A. testosterone3. B. ubiquinone4. D. 3 (farnesene); 6 (squalene)5. A. isoprene6. C. does not affect7. A. on the extracellular surface8. E. palmitate9. B. mitochondrial...