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Bio chemistry for nurses

164 questions found

Practice Questions

A protein loses its specific three-dimensional structure and function due to extreme changes in temperature or pH. This process is called:

A. Hydrolysis
B. Polymerization
C. Denaturation ✓
D. Renaturation
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Jun 6, 2026

A geneticist is studying a mutation that affects the sequence of amino acids in a protein. This change directly alters the protein’s:

A. Primary structure ✓
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
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Jun 6, 2026

A patient is experiencing severe metabolic alkalosis. To counteract this, the body might try to retain more carbon dioxide by:

A. Increasing respiratory rate.
B. Decreasing respiratory rate. ✓
C. Increasing bicarbonate excretion.
D. Increasing hydrogen ion excretion.
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Jun 6, 2026

A cell membrane is described as a “fluid mosaic.” This model highlights that the membrane is primarily composed of:

A. Rigid carbohydrate layers
B. A static protein scaffold
C. A fluid bilayer of phospholipids with embedded proteins ✓
D. A rigid cholesterol monolayer
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Jun 6, 2026

The process by which genetic information from a DNA strand is copied into an RNA molecule is known as:

A. Translation
B. Replication
C. Transcription ✓
D. Reverse transcription
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Jun 6, 2026

A patient with hypercholesterolemia needs to understand the role of cholesterol. Cholesterol is an important lipid that serves as a precursor for:

A. Amino acids
B. Glucose
C. Steroid hormones and vitamin D ✓
D. Fatty acids
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Jun 6, 2026

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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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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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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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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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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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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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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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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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 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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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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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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Jun 6, 2026
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