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Practice Questions

A cell requires constant energy for active transport. The primary source of this energy for most cellular processes is the hydrolysis of which molecule?

A. Glucose
B. Fatty acids
C. ATP ✓
D. ADP
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A laboratory technician is preparing a solution for a cell culture experiment. They need to maintain a stable pH within the solution. To achieve this, they would add a:

A. Strong acid
B. Strong base
C. Buffer ✓
D. Neutral salt
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient is diagnosed with a metabolic disorder characterized by the accumulation of a specific lipid in various tissues. A crucial component of biological membranes, forming a bilayer, is the:

A. Triglyceride
B. Cholesterol
C. Phospholipid ✓
D. Fatty acid
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

During cellular respiration, glucose is fully oxidized to carbon dioxide and water, releasing a large amount of energy. The initial stage of glucose breakdown, occurring in the cytoplasm and not requiring oxygen, is called:

A. Electron Transport Chain
B. Krebs Cycle
C. Glycolysis ✓
D. Gluconeogenesis
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A nutritionist is explaining the difference between saturated and unsaturated fatty acids. Unsaturated fatty acids are characterized by:

A. Only single bonds between carbon atoms.
B. The presence of one or more carbon-carbon double bonds. ✓
C. Being solid at room temperature.
D. Being found predominantly in animal fats.
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient is suffering from a condition where blood clots form easily. Vitamin K plays a crucial role in the synthesis of several blood clotting factors. This is an example of a vitamin acting as a:

A. Structural component
B. Energy source
C. Coenzyme ✓
D. Hormone
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A molecular biologist is performing PCR (Polymerase Chain Reaction). They need to separate the two strands of DNA by heating. This process, which disrupts hydrogen bonds but not covalent bonds, is known as:

A. Renaturation
B. Hybridization
C. Denaturation ✓
D. Replication
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient with severe liver disease has impaired ability to convert ammonia, a toxic byproduct of amino acid metabolism, into urea. This process is vital for detoxification and occurs in the:

A. Glycolysis pathway
B. Krebs Cycle
C. Urea Cycle ✓
D. Pentose Phosphate Pathway
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A biochemist is studying the properties of water. They note that water’s high specific heat capacity and ability to absorb significant amounts of heat without a large temperature change are due to:

A. Its nonpolar nature
B. The presence of ionic bonds
C. Extensive hydrogen bonding between water molecules ✓
D. Its low boiling point
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A person has been fasting for an extended period. The body needs to maintain blood glucose levels for brain function. The synthesis of glucose from non-carbohydrate precursors (like amino acids and glycerol) is called:

A. Glycogenesis
B. Glycogenolysis
C. Gluconeogenesis ✓
D. Glycolysis
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A medical researcher is investigating a new drug that inhibits a specific enzyme by binding to its active site, preventing the substrate from binding. This type of enzyme inhibition is best described as:

A. Non-competitive inhibition
B. Allosteric inhibition
C. Competitive inhibition ✓
D. Uncompetitive inhibition
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

During strenuous exercise, muscle cells may experience a limited supply of oxygen. In this anaerobic condition, pyruvate is converted to lactate, allowing glycolysis to continue and produce a small amount of ATP. This process is known as:

A. Krebs Cycle
B. Oxidative phosphorylation
C. Lactic acid fermentation ✓
D. Gluconeogenesis
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient requires intravenous fluid administration. A solution with a pH of 7.4 is considered physiologically neutral, as it matches the approximate pH of blood. A solution with a pH of 6.0 would be considered:

A. Strongly alkaline
B. Slightly alkaline
C. Acidic ✓
D. Neutral
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A forensic scientist is analyzing a blood sample. They extract a molecule that is a long, unbranched polymer of nucleotides, containing the bases A, U, G, and C, and is involved in protein synthesis. This molecule is most likely:

A. DNA
B. mRNA ✓
C. tRNA
D. rRNA
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A biochemist is studying the tertiary structure of a protein. This level of protein structure is primarily determined by interactions between:

A. Amino acid side chains (R-groups) ✓
B. Peptide bonds only
C. Hydrogen bonds between backbone atoms only
D. Disulfide bonds between distant amino acids
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient with a genetic condition cannot synthesize an essential amino acid. Essential amino acids are those that:

A. Are not required for protein synthesis.
B. Can be synthesized by the human body.
C. Must be obtained from the diet because the body cannot synthesize them. ✓
D. Are only found in plant-based foods.
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient presents with severe metabolic acidosis. The body’s buffer systems are crucial in maintaining blood pH within a narrow range. Which of the following is the most important extracellular buffer system in human blood?

A. Phosphate buffer system
B. Protein buffer system
C. Bicarbonate-carbonic acid buffer system ✓
D. Ammonia buffer system
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A biochemist is studying a newly discovered enzyme. They observe that as the substrate concentration increases, the reaction rate initially increases rapidly but then plateaus. This plateau indicates that the enzyme has reached its maximum velocity (Vmax?), which is defined as:

A. The substrate concentration at which the reaction rate is half of Vmax?
B. The initial rate of reaction
C. The reaction rate when all enzyme active sites are saturated with substrate ✓
D. The point at which the enzyme begins to denature
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A medical student is learning about the different types of carbohydrates. They identify a polysaccharide that serves as the primary storage form of glucose in animals, predominantly found in the liver and muscles. This polysaccharide is:

A. Starch
B. Cellulose
C. Glycogen ✓
D. Chitin
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026
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