BIOLCHEM 415 Lecture Notes - Lecture 26: Phosphatidylcholine, Photodissociation, Glucocorticoid

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21 Jul 2016

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Generally, lipids are separated into three classes based on their structure distinctions. Sphingolipids is the backbone to which lipids and other substitutes are attached. We will start out with phospholipids which is defined as containing the glycerol backbone and fatty acids attached to it and one phosphate. Phosphatidate is one of the intermediates in the synthesis of fats. From phosphatidate, we can go to fats or a series of phospholipids. The phosphatidatic acid reacts with ctp in order to form a cdp-diacylglycerol. We formed a bond and this requires energy. This energy comes from ctp, which is energetically the same as atp. A follow up reaction, the alcohol will react with the activated phosphatidate and the end result is the phospholipid, the glycerol backbone and two fatty acids attached and a phosphodiester. This is one way of providing the energy and activating one of the partners to synthesis a phospholipid.

Related Questions

Fill in the blank.

Fatty acids _______. A)can be branched or unbranched. B) are referred to as âsaturatedâ if they have one or more CâC double bonds. C) are highly oxidized storage forms of hydrocarbons. D) by definition, never exceed 20 carbons in length.

Triacylglycerols _______. A) always have at least one fatty acid with a trans double bond. B)consist of glycerol and three different fatty acids. C) are a major energy storage form. D) consist of glycerol and three identical fatty acids.

Mass spectrometry _______. A)can be used to identify individual lipids in complex mixtures. B)cannot be used with lipids other than fatty acids. C)can determine the mass but not the identity of a lipid. D) cannot determine the locations of double bonds in a fatty acid.

Which statement is true? A) Prostaglandins are found only in the prostate gland. B) Vitamin E is a hormone precursor. C) Vitamin D regulates milk production in mammary glands. D) Membrane sphingolipids can be used to produce intracellular messengers.

18- Which of the statements below are FALSE with respect to metabolism?

a) In stage 1 of metabolism, the processes of digestion break down the large macromolecules into small monomer units by hydrolysis.

b) In stage 1 of metabolism, the hydrolysis of complex molecules that take place in the stomach during digestion converts complex molecules such as carbohydrates, proteins and fats into their component monomeric units

c) In stage 1 of metabolism, the hydrolysis of complex molecules that take place in the stomach during digestion converts complex molecules into amino acids, glucose, fructose, galactose, glycerol, and fatty acids

d) Step one in metabolism occurs at the stage of digestion of the polysaccharides, lipids, and proteins that we ingest

e) Energy generation occurs in 3 stages

f) none of the above

BIOLCHEM 415 Lecture Notes - Lecture 26: Phosphatidylcholine, Photodissociation, Glucocorticoid

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