Test
Lipids: fatty acids, membranes and sterols review questions
Crea una cuenta gratis para terminar este test
Guarda tu progreso y consulta tu resultado final.
¿Ya tienes cuenta? Inicia sesión
Preguntas del test (23)
1Which of the following molecules or substances contain, or are derived from, fatty acids?
- ABeeswax
- BProstaglandins
- CSphingolipids
- DTriacylglycerols
- EAll of the above contain or are derived from fatty acids.
2Triacylglycerols are composed of:
- Aa glycerol backbone.
- Bthree fatty acids.
- Camide linkages between the fatty acids and the glycerol.
- DA and B above.
- EA, B, and C above.
3Which of the following is not a consequence of partial hydrogenation of vegetable oils?
- ALonger shelf life
- BLower melting temperature
- CReduction of some cis double bonds to single bonds
- DConversion of some cis double bonds to trans double bonds
- EIncreased risk of cardiovascular disease upon consumption by humans
4Biological waxes are all:
- Atriesters of glycerol and palmitic acid.
- Besters of single fatty acids with long-chain alcohols.
- Ctriesters of glycerol and three long chain saturated fatty acids.
- Dsphingolipids.
- ENone of the above
5Which of the following statements is true of lipids?
- AMany contain fatty acids in ester or amide linkage.
- BMost are simply polymers of isoprene.
- CTestosterone is an important sphingolipid found in myelin.
- DThey are more soluble in water than in chloroform.
- EThey play only passive roles as energy-storage molecules.
6Which of the following statements concerning fatty acids is correct?
- AA fatty acid is the precursor of prostaglandins.
- BPhosphatidic acid is a common fatty acid.
- CFatty acids all contain one or more double bonds.
- DFatty acids are a constituent of sterols.
- EFatty acids are strongly hydrophilic.
7Which of the following contains an ether-linked alkyl group?
- ACerebrosides
- BGangliosides
- CPhosphatidyl serine
- DPlatelet-activating factor
- ESphingomyelin
8Sphingosine is not a component of:
- Acardiolipin.
- Bceramide.
- Ccerebrosides.
- Dgangliosides.
- Esphingomyelin.
9Which of the following statements about membrane lipids is true?
- AGlycerophospholipids are found only in the membranes of plant cells.
- BGlycerophospholipids contain fatty acids linked to glycerol through amide bonds.
- CLecithin (phosphatidylcholine), which is used as an emulsifier in margarine and chocolate, is a
sphingolipid. - DSome sphingolipids include oligosaccharides in their structure.
- ETriacylglycerols are the principal components of erythrocyte membranes.
10Which of the following is not a glycerophospholipid?
- APhosphatidylcholine
- BPhosphatidylethanolamine
- CPhosphatidylserine
- DCardiolipin
- ECeramide
11Which of the following is true of sphingolipids?
- ACerebrosides and gangliosides are sphingolipids.
- BPhosphatidylcholine is a typical sphingolipid.
- CThey always contain glycerol and fatty acids.
- DThey contain two esterified fatty acids.
- EThey may be charged, but are never amphipathic.
12A compound containing N-acetylneuraminic acid (sialic acid) is:
- Acardiolipin.
- Bganglioside GM2.
- Cphosphatidylcholine.
- Dplatelet-activating factor.
- Esphingomyelin.
13Which of the following answers is not true?
- APhospholipase A1 hydrolyzes the fatty acid from the 1-position on the glycerol backbone.
- BPhospholipase B1 hydrolyzes the fatty acid from the 2-position on the glycerol backbone.
- CPhospholipase C hydrolyzes the complete phospho-head group from the glycerol backbone.
- DPhospholipase D hydrolyzes just the head group from the phospho-glycerol backbone.
14Which of the following statements about sterols is true?
- AAll sterols share a fused-ring structure with four rings.
- BSterols are found in the membranes of all living cells.
- CSterols are soluble in water, but less so in organic solvents such as chloroform.
- DCholesterol is the principal sterol in fungi.
- EThe principal sterol of animal cells is ergosterol.
15Fatty acids are a component of:
- Acarotenes.
- Bcerebrosides.
- Csterols.
- Dvitamin D.
- Evitamin K.
16Which of the following is not true of sterols?
- ACholesterol is a sterol that is commonly found in mammals.
- BSterols are commonly found in bacterial membranes.
- CSterols are more common in plasma membranes than in intracellular membranes (mitochondria,
lysosomes, etc.). - DSerols are precursors of steroid hormones.
- ESterols have a structure that includes four fused rings.
17Which of the following best describes the cholesterol molecule?
- AAmphipathic
- BNonpolar, charged
- CNonpolar, uncharged
- DPolar, charged
- EPolar, uncharged
18Tay-Sachs disease is the result of a genetic defect in the metabolism of:
- Agangliosides.
- Bphosphatidyl ethanolamine.
- Csterols.
- Dtriacylglycerols.
- Evitamin D.
19An example of a glycerophospholipid that is involved in cell signaling is:
- Aarachidonic acid.
- Bceramide.
- Cphosphatidylinositol.
- Dtestosterone.
- Evitamin A (retinol).
20Non-steroidal anti-inflammatory drugs (NSAIDS) like aspirin and ibuprofen act by blocking
production of:- Abiological waxes
- Bprostaglandins
- Csphingolipids
- Dvitamin D
- Enone of the above
21Which of the following is not a fat-soluble vitamin?
- AA
- BC
- CD
- DE
- EK
22Which vitamin is derived from cholesterol?
- AA
- BB12
- CD
- DE
- EK
23Which of the following techniques is not commonly used to analyze lipid composition?
- ASelective extraction using apolar solvents
- BAdsorption chromatography
- CX-ray crystallography
- DHydrolysis using enzymes with specificity for certain linkages
- EMass spectroscopy
Información
- Descripción
- Test sobre Sin título, creado por skittlesdx el 19/07/2015.
- Autor
- skittlesdx
- Idioma
- English
- Visitas
- 1
- Valoración
- Aún sin valoraciones Valora este test