BI 212: Lecture 1 - Awnswer

BIOLOGY101 - Lecture 1 Questions - was made by Human. cholesterol cholesterol i of4 consisting fused rings is What is this ? A- cholesterol and steroid B- Hydrophilic and hydrophobic C- Glycerol and Fatty acids D- Glyceraldehyde and Dihydroxyacetone imma Lipids characterized by a carbon skeleton consisting of four fused rings: A- Cholesterol B- Steroid C-phospholipids D- glycerol A component in animal cell membranes: A- Steroid B- Cholesterol C- hydrophilic D- hydrophobic When phospholipids are added to water, they self-assemble into a/an : A- dilayer B- trilayer C-bilayer D- tilayer When phospholipids are added to water , hydrophobic tails pointing towards the : interior I.MIL HIlIHKKIlY A- Head B- interior C - arm aiseoiar ai D- in between A-B Bj The structure of phospholipids found in : A- cell membranes B- only animals cell membranes C- only humans cell membranes D- Only plants cell membranes Described as the major component of all cell membranes : A- phospholipids B- Choline C- Glycerol D- Fatty acid combination of two fatty acids and a phosphate group are attached to glycerol : A- Lipids B- Glycerol C- Fatty acids D- phospholipids in phospholipids, the two fatty acids tails are : A- hydrophilic B- hydrophobic C- hydro-oxygen D- hydro-carbon ltstai_sarenonpoiar.a d awso.x r ermine e mop.at glycerol acids Fatty In phospholipids , the head of it is hydrophilic and consists of : A- phosphate group B- glycerol C- choline D- All choices Saturated fats are solid at : A- freezing point B- boiling point C- room temperature D- 31 C Most animals Fats are : A- saturated B-unsaturated C- 50% saturated D- 25% unsaturated Example of unsaturated fats : oils water Pepsi cup of tea Unsaturated fats are liquid at : A- freezing point B- boiling point C- room temperature D- 31 C Plants and fish fats are usually : A- saturated B- unsaturated C- 50% saturated D- 25% unsaturated wait a in : Fatty acids differ A- Height B - volume C - width D - length and differ in thenumberofdoablebondanditdifferinthelocation of double bonds Saturated fatty acids have the maximum number of hydrogen atoms and no double bond A- True B- False Unsaturated fatty acids have one double bonds : A- True B- False oneor more combination of two types of smaller molecules glycerol and fatty acids called : Fats polysaccharides saccharides Lipids Lipids are the one class of large biological molecules that form polymers A- True B- False don'tform hydrocarbons r nonpaur r I Lipids are hydrophilic because they consists mostly of water which form polar covalent bonds : A- True B- False I The most biologically important lipids are: A- fats B- phospholipids C- steroid D- A+B+C The relationship between many herbivores with microbes is : A- Symbiotic relationship B- Coexistence relationship C - Competitive relationship D - environmental relationship some of them use enzymes to digest cellulose : A-Microbes B- herbivores C- Bacteria D- mice cellulose passes through the digestive tract as insoluble fiber in : A- animals B- bacteria C- herbivores D- humans Enzymes that digest starch by : A- hydrolyzing alpha B- hydrolyzing beta C- hydrolyzing alpha and beta D- hydrolyzing water Polymers with B glucose are : A- straight B - helical C- Cycle D- square Example of alpha linkage of glucose monomers : A-Starch B- cellulose C- both A+B D- others not mentioned treated as a major component of the tough wall of plant cells : A- cellulose B- Starch C- glycerol D- polysaccharides ,in general. The one shared character between cellulose and starch : A- polymer of glycogen B- polymer of glucose C- polymer of polysaccharides D- Polymer of macromolecules Starch and cellulose are similar , but they differ in : A- Easter linkage B- Hydrophilic linkage C- glycosidic linkage D- Hydrophobic linkage of polysaccharides of plants , consists entirely of : Staren AA-storage glucose polymers B-glycogen monomers C- glucose monomers D- glycogen polymers Is within chloroplasts and other plastids : Plants store it as granules e A- additional starch B- surplus starch C- useless starch D- useful starch A storage polysaccharides in animals is : A- Starch B- cellulose C- Glycogen inliver muscle cells D- Lung The structure and function of a polysaccharides are determined by its : A- sugar monomers B- sugar polymers C- sugar monomers and the position of glycosidic linkage D- sugar polymers and the position of glycosidic linkage Glucose + Glucose -> ...................... A- sucrose B- Maltose C- Fructose D- Lactose a combination of Glucose and fructose form sucrose. Which of the following reactions do we use it to form sucrose : A- condensation reaction B- carbon dioxide reaction C -hydrolysis D- watering reaction Formed when a dehydration reaction joins only two monosaccharides : A- disaccharide B- polysaccharides C- white sugar D- C only if it has glycosidic linkage Aldoses What is this ? : A- Glucose B -Fructose C- Galactose D- Ribulose G Heroes IS 7 it has molecular formulas that are usually multiples of CH2O A-monosaccharides B- polysaccharides C- saccharides D- white sugar expressed as the most common monosaccharide : A- C5H10O5 Ribulose B-C5H10O5 Ribose C- C6H12O6 Glucose D- C6H12O6 Galactose carbonyl R e B H group _o Monosaccharides are classified by : carbonyl group A- The location of the carbonyl group B- The location of the carbonyl group and the number of carbons in carbon skeleton C- The location of the carboxyl group D - The location of the carboxyl group and the number of carbons in carbon skeleton It serve as a major fuel for cells and as raw material for building molecules A-Polysaccharides B- Monosaccharides C- macrosaccharides , in general. D- white sugar It include sugars and the polymers of sugars: A- Fats B- Steroids C- carbohydrates D- fatty acids Carbohydrate macromolecules are : A-monosaccharides B- polysaccharides C- microsaccharides D- supersaccharides If we want to break the bond of the polymers we add water. This reaction we call it : A-Hydrolysis B-Dehydration C- carbon dioxide reaction D- watering reaction All living things are made up of four classes of large biological molecules. polymers take part in: 15% of the four classes 30% of the four classes 50% of the four classes 75% of the four classes three four of 34 75 A large molecules composed of thousands of covalently connected monomers : A- Macromonomers B- Macropolymers C- Macromolecules D- supermolecules