Lipids Follow the instructions and then answer the questions about your Macromol

Question

Lipids Follow the instructions and then answer the questions about your Macromolecule .On the board label which structure is the fat molecule (triglyceride), the phospholipid, and the steroid. .Label the bonds which are specific to the formation of the that specific lipid . Where might each of these lipid be found? . Draw a saturated lipid with fatty acids that have a 6 Carbon backbone .Draw an unsaturated lipid with fatty acids that have a 7 Carbon backbone Pull out all of the functional groups that may be used in Carbohydrates 1. Which statement about phospholipids is incorrect? a.) Because their phosphate groups repel each 6. Which of the following statements concerning other, they are used as organisms' chief form unsaturated fats is correct? of short-tem energy b. They are hydrophobic at one end. C. Thay are hydrophilic at one end d. They are major constituents of cell membranes c. They ccntain glycerol linkod to faty acids a. They arc more common in animals b. They have no double bonds in the carbon chains of their fatty acids c. They are gonerally liquids at room d. They contain more hydrogen than do saturatod Eats having the same number of carbon atoms 2. Lipids are used for e. They have fewer fatty acids per Eat molecule a. Motion and defense b. Information storage C. Energy storage and for some hormones d. Enrymes and for soene hormones than do saturated fats 7. An amphipathic molecule has a. Two polar cnds. b. Two hydrophobic ends c. A hydrophobic and a hydrophilic portion d. Only one hydrophobic end e. Only one hydrophilic end 3. Which of these molecules is not formed by dehydration a. fatty acids 8. What is a distinguishing feature of most naturally occurring fats? a. They all share four fused rings as a carbon b. Nearly all naturally occurring unsaturated c. Most unsaturated fats have trans double . All organisms share an equal ratio of c. They are distinguished from other lipid Protein skelcton ats have cis double bonds bonds, causing a kink in the bydrocarbon Which of the following statements concerning saturated fats is not tue? 4. chain wherever they occur saturated and unsaturated Eatty acids. forms by their chief role as components of a· b· C. They are more common in animals than in plants They have multiple double bonds in the carbon chains of their fatty acids. They generally solidity at room temperature. They contain more hydrogen than maturated fats having the same number of carbon atoms They are one of several factors that contribute cell membranes d- 9. Lipids differ from other large biological molecules in that they e. do not contain carbon a are not truly polymers b. do not have specific shapes c. do not contain nitrogen and phosphorus 5. A molecule of a saturated triacylglycerol contains The maximum number of double bonds are much larger d. b The mmimam number of triple bonds between c. The maximum number of hydrogen atoms in d. Fatty acid chains with both amino and carbaxyl e. Alternating single and double bonds betwoen between carbons in the fatty acid chains carbons in the fatty acid chains the faty acid chains. groups. carbons in the fatty acid chains The lipids that form the main stractural component of cell membranes are 10. a phospholipids b. triacylglycerols c. cholesterol e. proteins

Explanation / Answer

Answer=

1]Statement about the phospholipid is icorrect is

a] because of their phosphate groups repel each other ,likely are used as organisms chief form of short term energy

explaination= their phosphate groups not repel each other

it is not a chief source of short term energy

all other statements are correct i.e. phospholipids are hydrophobic at one end while they are hydrophillic at other end,i.e.these are amphipathic molecules.

& these are major constituent of cell membrane i.e. about 55 %

each phospholipid is made from phosphate group head and two fatty acid tails that are connected by a glycerol molecule.

2]Lipids are used for

c]Energy storage and for some hormones

explaination= Lipid is the most important source of energy .high amount of energy can be stored in the form of lipids.

as well as some of lipids acts as a precursor for the synthesis of hormones.

most lipid harmones are steroid hormones

e.g.Estradiol,Testosterone ,aldosterone and cortisol.

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3]Which of these are not formed by dehydration reactions

a]Fatty acids

explaination= Dissacharides ,protein ,amylose all are formed by dehydration reaction with the removal of water.

in DNA ,phosphate -deoxyribose backbone is formed by a dehydration reaction.

but fatty acids monomers are not directly bonded to each other in polymer chain.

dehydration synthesis reaction in fatty acids form an ester linkage in between carboxyl group of fatty acid & hydroxyl group of alcohol monomer such as glycerol.

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