C624 Biochemistry
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Free C624 Biochemistry Questions
1. Na is the chemical symbol for
- Sodium
- Nitrogen
- Neon
- Calcium
Explanation
“Na” is the chemical symbol for sodium, derived from the Latin word “Natrium.” Sodium is a soft, silvery metal that belongs to the alkali metal group in the periodic table. It plays an essential role in maintaining fluid balance, nerve transmission, and muscle contraction in the human body. Sodium combines with chlorine to form table salt (NaCl), one of the most common compounds in everyday life.
2. What is the primary consequence of protein denaturation, and what typically triggers this process?
- Increased enzymatic activity due to temperature changes
- Loss of the protein's three-dimensional structure due to extreme pH or temperature
- Enhanced solubility of the protein in water
- Formation of new peptide bonds between amino acids
Explanation
Protein denaturation occurs when the protein’s secondary, tertiary, or quaternary structures are disrupted, causing it to lose its specific three-dimensional shape. This loss of structure also leads to a loss of biological function, as the shape of a protein is critical for its activity, especially for enzymes. Denaturation is typically triggered by extreme pH changes, high temperatures, or exposure to chemicals such as alcohols or heavy metals. While peptide bonds (primary structure) usually remain intact, the protein can no longer function properly after denaturation.
3. Which two factors are known to influence the speed at which a chemical reaction occurs?
- Pressure and surface area
- Concentration and temperature
- Catalysts and volume
- pH and ionic strength
Explanation
The rate of a chemical reaction depends largely on the frequency and energy of collisions between reactant particles. Two major factors that affect this are concentration and temperature. Increasing the concentration of reactants raises the number of particles in a given volume, thereby increasing the likelihood of collisions and speeding up the reaction. Similarly, increasing temperature provides particles with more kinetic energy, making collisions more energetic and effective in overcoming activation energy barriers. Together, these factors significantly influence reaction speed across most chemical systems.
4. Which of the following correctly categorizes carbohydrates based on their molecular size?
- Monosaccharides, disaccharides, and oligosaccharides
- Monosaccharides, disaccharides, and polysaccharides
- Oligosaccharides, polysaccharides, and starches
- Monosaccharides, polysaccharides, and proteins
Explanation
Carbohydrates are classified based on the number of sugar units they contain. Monosaccharides are the simplest form, consisting of a single sugar unit (such as glucose or fructose). Disaccharides contain two monosaccharide units joined by a glycosidic bond (such as sucrose or lactose). Polysaccharides are long chains of monosaccharide units linked together, forming complex carbohydrates like starch, glycogen, and cellulose. This classification helps in understanding their function, such as energy storage or structural support in organisms.
5. Which statement accurately describes the role of a catalyst in a chemical reaction?
- A catalyst is consumed during the reaction and cannot be reused.
- A catalyst increases the activation energy required for the reaction.
- A catalyst lowers the activation energy and remains unchanged after the reaction.
- A catalyst alters the products of the reaction.
Explanation
A catalyst functions by lowering the activation energy required for a reaction to proceed, allowing it to occur more quickly or under milder conditions. Importantly, the catalyst is not consumed or permanently altered in the reaction, meaning it can be reused multiple times. Catalysts do not change the equilibrium position or alter the products of a reaction; they simply help the system reach equilibrium faster. In biological systems, enzymes serve as catalysts that precisely regulate biochemical reactions essential for life.
6. Which one is true of a dipeptide?
- 2 amino acids are joined, water is eliminated and peptide bond formed
- 3 amino acids bonded by 2 peptides
- amino acids added to growing molecules
- many amino acids are joined together by many peptide bonds
Explanation
A dipeptide is formed when two amino acids join together through a dehydration synthesis (condensation) reaction. During this process, a molecule of water is released as the carboxyl group of one amino acid reacts with the amino group of another, creating a covalent bond known as a peptide bond. This bond connects the carbon of one amino acid’s carboxyl group to the nitrogen of the adjacent amino acid’s amino group. The resulting molecule is called a dipeptide, and this process represents the fundamental step in protein synthesis.
7. Which of the following is NOT a true statement concerning hydrogen bonds?
- Hydrogen bonds link atoms together to form molecules
- Hydrogen bonds are important for creating the shape of structures like proteins and DNA
- Hydrogen bonds form between molecules
- Hydrogen bonds are considered a weak bond
Explanation
Hydrogen bonds do not form atoms together into molecules; instead, they act as weak intermolecular forces that occur between molecules or within large molecules. They arise when a hydrogen atom that is covalently bonded to an electronegative atom (like oxygen or nitrogen) is attracted to another electronegative atom nearby. These bonds are crucial in stabilizing the three-dimensional structures of biological molecules such as proteins and DNA but are much weaker than covalent bonds.
8. How is acidity expressed in terms of pH?
- The pH scale is linear, so each number represents an equal change in H+ concentration.
- The pH scale is logarithmic, so each whole number change represents a 10-fold change in H+ concentration.
- The pH scale is exponential, so each whole number change represents a 100-fold change in H+ concentration.
- The pH scale is not related to H+ concentration.
Explanation
The pH scale is logarithmic, meaning each whole number change on the scale corresponds to a tenfold difference in hydrogen ion concentration. This relationship is expressed by the equation pH = -log[H⁺]. Therefore, a solution with a pH of 4 has ten times more hydrogen ions than a solution with a pH of 5. This logarithmic nature allows the pH scale to represent a wide range of hydrogen ion concentrations in a compact form, making it a useful measure of acidity or basicity in chemical and biological systems.
9. Blended but not bound, a combination of elements or compounds that are blended together but not bound by chemical bonds
- solution
- mixture
- colloid
- suspension
Explanation
A mixture is a physical combination of two or more substances that are not chemically bonded together. The components of a mixture retain their individual properties and can often be separated by physical means such as filtration or evaporation. Mixtures can exist in various forms, such as homogeneous (uniform composition, like saltwater) or heterogeneous (non-uniform composition, like sand and water). Unlike compounds, mixtures do not involve chemical bonding between components, and no new substances are formed.
10. How does the polarity of water contribute to its role as a solvent in biological systems?
- It allows water to form hydrogen bonds with other water molecules only.
- It enables water to dissolve nonpolar substances effectively.
- It facilitates the interaction of water with ionic and polar substances, enhancing solubility.
- It prevents water from participating in chemical reactions.
Explanation
Water’s polarity arises from the unequal sharing of electrons between oxygen and hydrogen atoms, making oxygen slightly negative and hydrogen slightly positive. This polarity allows water molecules to interact strongly with other polar molecules and ions by forming hydrogen bonds or electrostatic attractions. As a result, ionic compounds such as salts and polar molecules like sugars readily dissolve in water, making it an excellent solvent for biological reactions. This property supports many life processes, including nutrient transport and metabolic reactions.
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