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- Which of the following functions is NOT or cannot be performed by lipids? They can serve as chemical messengers. They can help in the selective permeability of membranes. They can form pores for the thermodynamically favored passage of ions across membranes. They can bind to DNA response elements to control gene expression.Which of the following statements is incorrect? The rigidity of a saturated fatty acid is based on the strong bonding between sp3-hybridized carbon chains. Glycerophospholipids are the most abundant lipids in cellular membranes. In delta notation of fatty acid nomenclature, the numbering starts at the α-carbon from the carboxylic acid end. Hormones, such as testosterone, estradiol and progesterone are examples of steroidal lipids.Which of the following is not the function of Glycosylation? Synthesis of membrane lipid O Helps in proper folding of the protein O Confer stability in proteins Helps in cell-cell adhesion
- Which of the following might be a feature(s) of a lipid that has been converted from a fully saturated fatty acid to a fatty acid containing several trans double bonds? Select all that apply. The trans fatty acid will now have a higher melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack more closely with saturated fatty acids, than with unsaturated fatty acids containing cis double bonds The trans fatty acid will now have a lower melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack most closely with unsaturated fatty acids containing cis double bonds, than with saturated fatty acidsMatch the following descriptions with the correct lipid-based compounds: Cholesterol Sphingolipids Phosphoacylgycerol Glycerophospholipids Fatty acyls…Which of the following functions is NOT or cannot be performed by lipids? They can bind to DNA response elements to control gene expression. They can serve as chemical messengers. They can help in the selective permeability of membranes. They can form pores for the thermodynamically favored passage of ions across membranes.
- Which of the following is true of sphingolipids? They always contain glycerol and fatty acids. They may be charged, but are never amphipathic. They contain two esterified fatty acids. Phosphatidylcholine is a typical sphingolipid. The sphingosine backbone is O-linked to a head group.Characteristics of lipids: A Steroids are molecules characterized by cy- cles; B Diacylglycerol molecules are lipids found in the plasma membrane as well as in en- domembranes; C Waxes are aromatic molecules found in es- sential oils; D Sphingosine is an alcohol, which can con- tain a phosphate group; E Phospholipids are molecules found within the vacuole of an adipocyte.TRUE OR FALSE Lipids are insoluble in water but soluble in ether TAG mean triacylglycerol Phospholipids function as membrane lipids TAG contains fatty acids and glycerol Fatty acids contains even number of carbon atoms Saturated fatty acids have low melting points Butyric acid usually comes from coconut oil Unsaturated fatty acids contain single bonds only in their structure Arachidonic acid contains 3 double bonds Theobroma oil is a liquid fat
- 1 3 6 HO-C-H CH₂OH c=0 H-C-OH I H-C-OH CH₂OH H Н Н N-C-C CH =0 он HC CH2 CH3 4 но TII H2N-C-C-ОН 7 CH2 | ОН CH₂OH ОН о о ОН ОН 8 5 2 0 0=P-0 о NH₂ N OHglycerol Lecithins and cephalins are both ; they consist of with fatty acids forming groups. The third phosphoester bonds with the first and second forms a with phosphoric acid, which glycerophospholipids group of the forms another bond with an amino alcohol. In lecithins, the amino alcohol is ester ; in cephalins, the amino alcohol is usually choline amino sphingosine sphingolipids ethanolamine hydroxyl amideFrom the list below, select the statements that are FALSE. (more than one) OThe hydropathy index plot is used to identify hydrophobic patches inside the cell membrane's architecture. The GPI anchor is a special biomolecule linking a protein to the cell membrane. The phosphoglycerides of the cell membrane contain only saturated or monounsaturated fatty acids. O Phosphoglycerides are to be considered amphiphilic. ONaturally, unsaturated fatty acids typically exist in the trans configuration.