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Biological Chemistry
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- In dehydration synthesis reactionsa) water is a product.b) water is a reactant.c) water is converted to hydrogen and oxygen.d) hydrogen and oxygen gain electrons.
- Energy is never lost, created, or destroyed, but is only changed from one form to another or transferred from one place to another. This statement is know as:a. potential energy.b. the law of conservation of energy.c. chemical equation.d. the law of oxidation and reduction.
- Magnesium atoms have two electrons in their outermost shells and chlorine atoms have seven. The compound magnesium chloride would containa) 1 magnesium and 1 chlorine.b) 1 magnesium and 2 chlorine.c) 2 magnesium and 7 chlorine.d) impossible to tell without more information
- The term ________ means each enzyme catalyzes only one type of reaction.a) saturationb) specificityc) inertiad) activation
- All of the following are macromolecules except A- RNA.B- salt.C- protein.D- DNA.E- glycogen.
- In condensation reactions, the atoms that make up a water molecule are derived from A- oxygen.B- both reactants.C- one of the reactants.D- the enzyme.E- carbohydrates.
- The shape of a folded protein is determined by A- the number of peptide bonds.B- the sequence of its amino acids.C- its tertiary structure.D- whether the peptide bonds have α or β linkages.E- the base-pairing rules.
- A triglyceride contains fatty acids and A- glycerol.B- glucose.C- a base.D- an amino acid.E- a phosphate.
- Aldehydes and ketones are very similar in that they both contain A- nitrogen atoms.B- sulfur atoms.C- two R groups.D- phosphorus atoms.E- a keto group.
- In a biological membrane, the phospholipids are arranged with the fatty acid chains facing the interior of the membrane. As a result, the interior of the membrane is A- filled with water.B- hydrophilic.C- polar.D- hydrophobic.E- charged.
- Which statement about fatty acids is true? A- They become saturated at low pH.B- They contain glycerol and a carboxyl group.C- They contain three fats bonded to a glycerol.D- They are composed of a hydrocarbon tail and a carboxyl group.E- They are carbohydrates linked to a hydrocarbon chain.
- True or False: Both proteins and nucleic acids are linear models
- All amino acids have an amino group, an R group, and a(n) ___________ group.
- In proteins, amino acids are linked together by _______ bonds.
- True or False: C - C bonds are stronger than Si - Si bonds
- A student claims that all triglycerides have the exact same properties, since they are all composed of the same units: a glycerol molecule and three fatty acids. Which statement provides the best response to this claim? A- The claim is correct because all triglycerides have the same pattern of ester linkages between fatty acids and glycerol.B- The claim is incorrect because triglycerides can assume different shapes due to random motion of their hydrocarbon chains.C- The claim is incorrect because triglycerides are found in many different types of organisms.D- The claim is incorrect because the hydrocarbon chins of triglycerides vary in length and number of double bonds.E- The claim is correct because all fatty acid tails consist of long hydrocarbon tails that contribute to the nonpolar nature of triglycerides as a class.
- What do biological fuels (fuels that power machinery) produce when reacting with Oxygen?
- What three naturally occurring elements make up 98% of the atoms in an organism?
- Molecules containing a large number of hydroxyl groups are A- structurally less stable than those with fewer hydroxyls.B- nonpolar.C- complex macromolecules.D- basic.E- soluble in water.
- Cholesterol is soluble in ether, a nonpolar organic solvent, but it is not soluble in water. Based on this information, to which class of biological macromolecules does cholesterol belong? A- CarbohydratesB- EnzymesC- LipidsD- Nucleic acidsE- Proteins