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Bio chemistry for nurses

164 questions found

Practice Questions

A clinical scenario involves a patient with a genetic defect affecting a mitochondrial enzyme crucial for aerobic respiration. Which of the following metabolic pathways would be most directly and significantly impacted by this defect?

A. Glycolysis
B. Pentose Phosphate Pathway
C. Krebs Cycle (Citric Acid Cycle) ✓
D. Glycogenesis
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A dietician is explaining the importance of different types of fats in the diet. They describe a lipid molecule composed of a glycerol backbone esterified to three fatty acids. This molecule is commonly known as a:

A. Phospholipid
B. Steroid
C. Triglyceride ✓
D. Waxes
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A molecular biologist is studying the structure of DNA. They recall that the two strands of the DNA double helix are held together by hydrogen bonds between complementary base pairs. Which base pairing correctly describes this interaction?

A. Adenine with Guanine, Cytosine with Thymine
B. Adenine with Thymine, Cytosine with Guanine ✓
C. Adenine with Cytosine, Guanine with Thymine
D. Adenine with Uracil, Cytosine with Guanine
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A patient with uncontrolled diabetes is experiencing severe muscle weakness and fatigue. Biochemically, this could be linked to an impaired ability of cells to generate ATP effectively through glucose oxidation. Which of the following molecules directly acts as the primary energy currency of the cell?

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

A student is tasked with drawing the basic structure of an amino acid. They correctly identify that all amino acids found in proteins contain a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a unique side chain (R-group). The R-group primarily determines the amino acid’s:

A. Melting point
B. Size
C. Polarity and chemical properties ✓
D. Molecular weight
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nmdcat.online Bio chemistry for nurses
Jun 6, 2026

A common dietary deficiency is a lack of certain vitamins. A patient presents with symptoms of scurvy, including bleeding gums and poor wound healing. This condition is caused by a deficiency of:

A. Vitamin A
B. Vitamin B1 (Thiamine)
C. Vitamin C (Ascorbic Acid) ✓
D. Vitamin D
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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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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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Jun 6, 2026
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