Test
Chapter 9
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Preguntas del test (16)
1Which of the following provides the best reason as to why trans-oleic acid has a higher melting temperature relative to cis-oleic acid?
- AA cis-double-bond does not produce the 30° kink in the fatty acid chain, that the trans-double-bond produces, and therefore it packs more efficiently in the solid state.
- BA trans-double-bond does not produce the 30° kink in the fatty acid chain, that the cis-double-bond produces, and therefore it packs more efficiently in the solid state.
- CBoth fatty acids have the same melting temperature because they both consist of the same number of carbon atoms.
- DA fatty acid with a trans-double-bond packs more efficiently in the solid state because of favorable p-bond stacking that is much more highly efficient and thus favorable in comparison to cis-double-bond stacking arrangement.
2Which of the following triacylglycerides releases the most energy upon oxidation (combustion)?
- AA triacylglyceride with three residues of olecic acid.
- BA triacylglyceride with three residues of alpha-linoleic acid.
- CA triacylglyceride with three residues of stearic acid.
- DA triacylglyceride with three residues of linoleic acid.
3Which of the following is the correct name for the glycerophospholipid depicted in the attached image?
- A1-palmitoyl-2-oleoyl-3-phosphotidylserine
- B1-stearoyl-2-oleoyl-3-phosphotidylserine
- C1-stearoyl-2-oleoyl-3-phosphotidylcholine
- D1-palmitoyl-2-oleoyl-3-phosphotidylcholine
4Which of the following are the correct products obtained when 1-palmitoyl-2-oleoyl-3-phosphotidylserine is hydrolyzed by phospholipase A1?
- Aphosphoserine and 1-palmitoyl-2-oleoyl-glycerol
- Bpalmitic acid and 2-oleoyl-3-phosphotidylserine
- Coleic acid and 1-palmitoyl-3-phosphotidylserine
- Dserine and 1-palmitoyl-2-oleoyl-phosphatidic acid
5Which of the following are the correct products obtained when 1-palmitoyl-2-oleoyl-3-phosphotidylserine is hydrolyzed by phospholipase A2?
- Aserine and 1-palmitoyl-2-oleoyl-phosphatidic acid
- Bpalmitic acid and 2-oleoyl-3-phosphotidylserine
- Cphosphoserine and 1-palmitoyl-2-oleoyl-glycerol
- Doleic acid and 1-palmitoyl-3-phosphotidylserine
6Which of the following are the correct products obtained when 1-palmitoyl-2-oleoyl-3-phosphotidylserine is hydrolyzed by phospholipase C?
- Aoleic acid and 1-palmitoyl-3-phosphotidylserine
- Bphosphoserine and 1-palmitoyl-2-oleoyl-glycerol
- Cserine and 1-palmitoyl-2-oleoyl-phosphatidic acid
- Dpalmitic acid and 2-oleoyl-3-phosphotidylserine
7Which of the following are the correct products obtained when 1-palmitoyl-2-oleoyl-3-phosphotidylserine is hydrolyzed by phospholipase D?
- Aoleic acid and 1-palmitoyl-3-phosphotidylserine
- Bserine and 1-palmitoyl-2-oleoyl-phosphatidic acid
- Cpalmitic acid and 2-oleoyl-3-phosphotidylserine
- Dphosphoserine and 1-palmitoyl-2-oleoyl-glycerol
8Which of the following glycerophospholipids cannot form hydrogen bonds?
- Aphosphatidic acid
- Bphosphotidylserine
- Cphosphotidylinositol
- Dlecithin
9In some autoimmune diseases, an individual develops antibodies that recognize cell constituents such as DNA and phospholipids. Some of the antibodies react with both DNA and phospholipids. Which of the following provides the best reason for the structural reactivity for this cross-reactivity?
- ABoth DNA and phospholipids have exposed hydrophobic fatty acid groups that are recognized by the antibodies.
- BBoth DNA and phospholipids have exposed nitrogenous base groups that are recognized by the antibodies.
- CBoth DNA and phospholipids have exposed phosphate groups that are recognized by the antibodies.
- DBoth DNA and phospholipids have exposed carbohydrate groups that are recognized by the antibodies.
10Most hormones, such as peptide hormones, exert their effects by binding to cell-surface receptors. However, steroid hormones do so by binding to cytosolic receptors. Which of the following provides the best reason as to why this is the case?
- ASteroid hormones, which are hydrophobic upon binding cholesterol, readily diffuse through the cell membrane as a functional steroid hormone/cholesterol complex to reach their cytosolic receptors.
- BSteroid hormones, which tend to be hydrophilic, are actively transported through the cell membrane by membrane translocases.
- CSteroid hormones, which are hydrophobic, can readily diffuse through the cell membrane to reach their cytosolic receptors.
- DSteroid hormones, which are hydrophobic, are actively transported through the cell membrane by membrane translocases.
11Animals cannot synthesize linoleic acid (a precursor of arachidonic acid) and therefore must obtain this essential fatty acid from their diet. Which of the following provides the best explanation as to why cultured animal cells can survive in the absence of linoleic acid?
- AEicosanoids synthesized from arachidonic acid are not necessary for intercellular communication. Cultured cells do not need such communication and therefore do not require linoleic acid.
- BEicosanoids synthesized from arachidonic acid are necessary for intercellular communication. Cultured cells do not need such communication and therefore do not require linoleic acid.
- CEicosanoids synthesized from arachidonic acid are necessary for intracellular communication. Cultured cells also need such communication and therefore do not require linoleic acid.
- DEicosanoids synthesized from arachidonic acid are necessary for intercellular communication. Cultured cells need such communication and therefore require linoleic acid.
12Many bacterial fatty acids contain branches and even rings. Which of the following describes the effect that these lipids have on membrane fluidity, in comparison to their straight-chain counterparts?
- AThe branched and ring-containing fatty acids will decrease membrane fluidity because they pack next to other lipids more efficiently than straight-chain fatty acids.
- BThe branched and ring-containing fatty acids will decrease membrane fluidity because they cannot pack next to other lipids as efficiently as straight-chain fatty acids.
- CThe branched and ring-containing fatty acids will increase membrane fluidity because they cannot pack next to other lipids as efficiently as straight-chain fatty acids.
- DThe branched and ring-containing fatty acids will increase membrane fluidity because they pack next to other lipids more efficiently than straight-chain fatty acids.
13Which of the following provides the best reason as to why triacylglycerols cannot be significant components of cell membranes?
- ATriacylglycerols lack polar head groups, so they do not orient themselves in a bilayer with their acyl chains inward and their glycerol moiety toward the surface.
- BTriacylglycerols lack polar head groups, so they do not orient themselves in a bilayer with their acyl chains outward and their glycerol moiety toward the surface.
- CTriacylglycerols lack polar head groups, so they do not orient themselves in a bilayer with their acyl chains inward and their glycerol moiety pointing away from the surface.
- DTriacylglycerols lack polar head groups, so they orient themselves in a bilayer with their acyl chains inward and their glycerol moiety toward the surface.
14Which of the following provides the best reason as to why a bilayer containing only gangliosides would be unstable?
- AThe large oligosaccharide head groups of gangliosides would prevent the necessary close packing of the lipids in a bilayer.
- BThe large oligosaccharide head groups of gangliosides would prevent the necessary close packing of the lipids in a monolayer.
- CThe large oligosaccharide head groups of gangliosides would cause too close packing of the lipids in a monolayer.
- DThe large oligosaccharide head groups of gangliosides would cause too close packing of the lipids in a bilayer.
15When bacteria growing at 30° C are cooled to 20° C, which types of membrane lipids are they more likely to synthesize in response to the temperature change?
- Asaturated and long-chain fatty acids
- Bsaturated and short-chain fatty acids
- Cunsaturated and long-chain fatty acids
- Dunsaturated and short-chain fatty acids
16Which of the following types of membrane lipids would the tropical Arowana fish have more of in comparison to the Antarctic icefish (see page 176)?
- Asaturated and short-chain fatty acids
- Bunsaturated and short-chain fatty acids
- Cunsaturated and long-chain fatty acids
- Dsaturated and long-chain fatty acids
Información
- Descripción
- Chem 365 Test sobre Chapter 9, creado por Crisila A el 10/11/2020.
- Autor
- Crisila A
- Idioma
- English
- Visitas
- 4
- Historial
- Creado el 10 nov 2020 · actualizado el 10 nov 2020
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