practice questions key

practice questions key - Name:_ Date: _ LS 2 Practice...

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Name:__________________ Date: __________________ LS 2 Practice Questions 1. Covalent bonds differ from ionic bonds in that covalent bonds a. Are more easily broken in water b. Form ions in solution c. Involve one element giving up electrons to another d. Link positively charged to negatively charged elements e. Result from the sharing of electrons between elements 2. Which of the following statements about water is not true? a. It absorbs a large amount of heat when changing from liquid into vapor b. Its solid form is less dense than its liquid form c. It allows nonpolar substances to dissolve in it d. It is typically the most abundant substance in an active organism e. It takes part in some important chemical reactions 3. Proteins are made up of amino acids linked together by peptide bonds, classified as which type of chemical bond? a. Covalent b. Hydrogen c. Hydrophobic d. Ionic e. None of the above 4. Which of the following molecules represents the storage form of lipid in the body? a. ATP b. Cholesterol c. Glucose d. Glycogen e. Triglyeride 5. All lipids are a. Triglycerides b. Polar c. Hydrophilic d. Polymer e. More soluble in nonpolar solvents than in water 6. Lipids in membranes are composed of a. Amino acids b. Glycerol attached to fatty acids c. Proteins attached to sugars d. Phosphate groups attached to proteins e. Polysaccharides 7. All carbohydrates a. Are polymers b. Are simple sugars c. Consist of one or more simple sugars d. Are found in biological membranes e. Are more soluble in nonpolar solvents then in water 8. Polysaccharides, polypeptides, and polynucleotides all a. Are formed from condensation reactions b. Are found in cell membranes c. Contain simple sugars d. Contain nitrogen e. Are not soluble in water 9. All proteins a. Are enzymes b. Contain the same amino acid sequence c. Have a linear, flat shape d. Consist of one or more polypeptide chains e. Are more soluble in nonpolar solvents than in water 10. The primary structure of a protein is determined by its a. Disulfide bridges b. Alpha helix structures
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c. Order of amino acids
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practice questions key - Name:_ Date: _ LS 2 Practice...

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