C624 Biochemistry
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Free C624 Biochemistry Questions
What is an anion?
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An anion is defined as an atom that has lost electrons and forms a negative charge.
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An anion is defined as an atom that has gained electrons and forms a negative charge.
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An anion is defined as an atom that has gained electrons and forms a positive charge.
Explanation
An anion is an atom or molecule that has gained one or more electrons, resulting in a net negative charge. Because electrons carry a negative charge, gaining them increases the atom’s negative electrical potential. Nonmetal atoms commonly form anions in ionic compounds; for example, chlorine gains an electron to form Cl⁻. Anions are attracted to positively charged ions, or cations, leading to the formation of stable ionic bonds in compounds such as sodium chloride (NaCl).
What do protease enzymes do?
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It breaks down proteins into peptides and amino acids.
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It breaks down nucleic acids into nucleotides.
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It breaks down carbohydrates into starch and sugar.
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It breaks down fats into fatty acids and glycerol.
Explanation
Protease enzymes, also known as peptidases or proteinases, catalyze the hydrolysis of peptide bonds in proteins. This process breaks large protein molecules into smaller peptides and ultimately into individual amino acids, which can then be absorbed and utilized by the body for various functions such as tissue repair, enzyme synthesis, and metabolic processes. Proteases play a key role in digestion (e.g., pepsin in the stomach and trypsin in the small intestine) and in cellular regulation, immune response, and protein turnover.
Which of the following statements accurately describes the composition and formation of proteins?
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Proteins are made up of nucleotides linked by phosphodiester bonds.
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Proteins consist of 20 different amino acids linked together by peptide bonds.
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Proteins are formed from monosaccharides through glycosidic bonds.
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Proteins are composed of fatty acids and glycerol connected by ester bonds.
Explanation
Proteins are complex macromolecules essential for nearly all biological functions. They are composed of 20 standard amino acids that link together through peptide bonds formed by dehydration synthesis between the amino group of one amino acid and the carboxyl group of another. This sequence of amino acids determines the protein’s structure and function. The folding and interactions among amino acid side chains result in the formation of specific three-dimensional structures that are critical for enzyme activity, structural support, transport, and regulation within cells.
In a solution, which term refers to the component that is present in the greatest amount?
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Solute
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Solvent
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Solution
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Colloid
Explanation
In a solution, the solvent is the component present in the greatest amount and serves as the medium in which the solute is dissolved. The solute is the substance present in a smaller amount and becomes evenly distributed within the solvent. For example, in a saltwater solution, water acts as the solvent while salt is the solute. The solvent determines the phase of the solution and influences its physical and chemical properties.
What is the role of enzymes in relation to activation energy during biochemical reactions?
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Enzymes increase the activation energy needed for reactions
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Enzymes have no effect on activation energy
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Enzymes lower the activation energy required for reactions
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Enzymes convert activation energy into kinetic energy
Explanation
Enzymes are biological catalysts that accelerate biochemical reactions by lowering the activation energy — the minimum energy required to initiate a chemical reaction. By providing an alternative reaction pathway with a lower energy barrier, enzymes enable reactions to occur more rapidly and efficiently at normal body temperatures. This function is essential for maintaining metabolic processes that sustain life. Importantly, enzymes do not alter the overall energy balance or products of a reaction; they simply make it easier for reactants to reach the transition state.
Which two forms of energy are primarily involved in chemical reactions?
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Kinetic energy and thermal energy
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Potential energy and mechanical energy
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Kinetic energy and potential energy
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Chemical energy and radiant energy
Explanation
Chemical reactions involve the transformation of energy as bonds are broken and formed between atoms. The two main forms of energy at play are kinetic energy and potential energy. Kinetic energy is associated with the movement of particles, such as atoms and molecules colliding during reactions. Potential energy, on the other hand, is stored in the chemical bonds of molecules. When these bonds are broken, potential energy is converted into kinetic energy or other usable forms. The balance and conversion between these two energy forms determine the rate and direction of chemical reactions.
Why are bond formation and breaking crucial in the context of chemical reactions?
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They allow for the conservation of mass during reactions.
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They lead to the rearrangement of atoms and the formation of new substances.
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They increase the temperature of the reaction environment.
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They prevent the occurrence of exothermic reactions.
Explanation
Chemical reactions fundamentally involve the breaking of existing bonds and the formation of new ones. This process allows atoms to rearrange into new configurations, creating different substances with new chemical and physical properties. The breaking of bonds requires energy input, while the formation of new bonds releases energy. The balance between these processes determines whether a reaction is endothermic or exothermic. This dynamic of bond-breaking and bond-making is the core mechanism through which all chemical changes occur.
Which is NOT true about catalysts.
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The catalyst is modified at the end of a chemical reaction.
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A catalyst helps to properly orient the colliding particles of matter.
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Catalysts do not alter the difference in the potential energy between the reactants and products.
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Catalysts lower the activation of energy needed for a reaction to occur.
Explanation
Catalysts function by lowering the activation energy required for a chemical reaction, thereby speeding up the rate of reaction without being consumed or permanently altered in the process. They work by orienting reactant molecules more effectively, allowing collisions to occur in the correct alignment for bond formation or breaking. Importantly, catalysts do not affect the overall energy difference (enthalpy change) between reactants and products — they only change the pathway by which the reaction proceeds. Thus, any statement suggesting that catalysts are chemically modified or consumed by the reaction is incorrect.
Which of the following correctly identifies the four hierarchical levels of protein structure?
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Primary, Secondary, Tertiary, Quaternary
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Alpha, Beta, Gamma, Delta
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Simple, Complex, Conjugated, Fibrous
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Linear, Circular, Branched, Network
Explanation
Proteins exhibit four levels of structural organization that define their shape and function. The primary structure is the linear sequence of amino acids linked by peptide bonds. The secondary structure refers to local folding patterns like alpha-helices and beta-pleated sheets, stabilized by hydrogen bonds. The tertiary structure is the overall three-dimensional folding of a single polypeptide chain, determined by interactions among side chains (R-groups). Finally, the quaternary structure describes the assembly of multiple polypeptide subunits into a functional protein complex. Together, these hierarchical levels determine how a protein performs its biological roles.
Which of the following best describes the energy changes that occur during an exergonic reaction?
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Energy is absorbed from the surroundings, resulting in a net gain of energy.
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Energy is released to the surroundings, leading to a net loss of energy.
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Energy remains constant throughout the reaction, with no net change.
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Energy is converted into mass, following Einstein's theory of relativity.
Explanation
An exergonic reaction is one in which the products contain less free energy than the reactants, meaning energy is released during the process. This energy release often occurs as heat or light and makes the reaction spontaneous. Because the total energy of the system decreases, there is a net loss of energy from the system to the surroundings. Examples include cellular respiration and the breakdown of ATP, both of which release usable energy for cellular functions.
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