Biological Chemistry Questions
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Lipids are A- hydrophobic.B- soluble in water.C- composed of carbon, nitrogen, and hydrogen.D- important for transmission of biological information.E- absent from cell membranes.
Comparing two fatlike solid substances, you determine that sample A has a higher melting point than sample B. Sample A, therefore, A- is an unsaturated fat, and sample B is a saturated fat.B- has a higher number of carbon-carbon double bonds.C- is a triglyceride, and sample B is a simple lipid.D- is a saturated fat, and sample B is an unsaturated fat.E- has a lower number of carbon-carbon double bonds
The atoms that make up carbohydrates are A- C, H, O, and N.B- C and H.C- C, H, and P.D- C, H, and O.E- C, H, and N.
Molecules that both attract and repel water are called A- amphipathic.B- hydrophilic.C-- amphoric.D- hydrophobic.E- glycosidic.
The functional group written as -COOH is called the _________ group
Glucose and fructose both have the formula C6H12O6, but the atoms in these two compounds are arranged differently. Glucose and fructose are therefore A- pentoses.B- isotopes.C- isomers.D- polysaccharides.E- stereosaccharides.
A molecule with the formula C15H30O15 is most likely a A- protein.B- lipid.C- carbohydrate.D- hydrocarbon.E- nucleic acid.
A simple sugar with the formula C5H10O5 can be classified as a A- hexose.B- lipid.C- polysaccharide.D- pentose.E- disaccharide.
A peptide bond forms between a(n) _______ group on one molecule and a(n) _______ group on the other molecule. A- hydrogen; carboxylB- carboxyl; RC- amino; carboxylD- amino; RE- R; hydrogen
Which statement about lipids is true? A- They can act as an energy storehouse.B- They may form two layers when mixed with organic solvents.C- They function as catalysts of chemical reactions.D- They are readily soluble in water.E- They absorb large amounts of energy when broken down.
Steroids are classified as lipids because they A- are composed of nonpolar and hydrophobic functional groups.B- are amphipathic.C- have a ring structure similar to glucose.D- form α and β isomers.E- are composed of molecules that are bound together with glycosidic linkages.
Unsaturated fatty acids do not pack together because of the _______ in their hydrocarbon chains. A- double bondsB- van der Waals forcesC- glycosidic linkagesD- disulfide bridgesE- peptide bonds
If a hydrophilic amino acid on the surface of an enzyme were changed to a hydrophobic amino acid, which result would be possible? A- The tertiary structure would be stabilized by new hydrophobic interactions.B- The activity of the enzyme would remain unchanged.C- The function of the enzyme could be expanded to allow it to bind many new substrates.D- The protein's ability to form peptide bonds could be affected.E- The folding pattern of the enzyme's polypeptide chain would change.
Polymerization reactions in which polysaccharides are synthesized from monosaccharides A- between the monosaccharides.B- are hydrolysis reactions.C- release phosphate.D- depend on van der Waals forces to hold the monosaccharides together.E- result in the formation of water.
During the formation of a peptide linkage, a(n) _______ is formed. A- hydrophobic bondB- hydrophilic bondC- molecule of waterD- ionic bondE- disulfide bridge
Leucine and valine have side chains that do not interact with water; therefore, they A- are electrically charged.B- form only left-handed isomers.C- are nonpolar.D- are hydrophilic.E- have sulfur atoms in their side chains.
A β pleated sheet organization in a polypeptide chain is an example of _______ structure. A- tertiaryB- secondaryC- coiledD- quaternaryE- primary
The amino acids of the protein keratin are arranged in a helix. This secondary structure is stabilized by A- peptide bonds.B- glycosidic linkages.C- polar bonds.D- covalent bonds.E- hydrogen bonds.
The monomers that make up polymeric carbohydrates like starch are called A- trisaccharides.B- nucleosides.C- fatty acids.D- nucleotides.E- monosaccharides.
Starch and glycogen, which are both polysaccharides, differ in their functions in that starch is _______, whereas glycogen _______. A- a temporary compound used to store glucose; is a highly stable compound that stores complex lipidsB- the main energy storage of animals; is a temporary compound used to store glucoseC- the principal energy storage compound of plants; is the main energy storage of animalsD- the main component for plant structural support; is an energy source for animalsE- a structural material found in plants and animals; forms external skeletons in animals