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Quizzes > Science

Biochemistry Quiz: Introductory Practice on Core Molecules

15 biochemistry practice questions. Quick and free, with instant feedback.

Editorial: Review CompletedCreated By: Jade SommakiUpdated Aug 28, 2025
Difficulty: Moderate
Questions: 15
Study OutcomesAdditional Reading
3D voxel art for the course Introductory Biochemistry

This biochemistry quiz helps you review core topics-carbohydrates, lipids, proteins, nucleic acids, vitamins, and coenzymes-and spot gaps before exams. Answer 15 questions, get instant results, and use the feedback to guide study. For more practice, try the biology macromolecules quiz, build your base with a basic chemistry quiz, or reinforce fundamentals with a cell biology quiz.

Which functional group is present in all amino acids and acts as a base at physiological pH?
Aldehyde group (-CHO)
Hydroxyl group (-OH)
Carboxyl group (-COOH)
Amino group (-NH2)
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Water's ability to dissolve many ionic compounds is primarily due to which property?
Polarity and hydrogen bonding
Low heat capacity
High compressibility
Nonpolarity
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Which level of protein structure is defined by the sequence of amino acids?
Secondary
Tertiary
Primary
Quaternary
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Which bond stabilizes alpha helices and beta sheets in proteins?
Peptide bonds between side chains
Hydrogen bonds between backbone groups
Disulfide bonds
Ionic bonds
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Which monosaccharide is an aldose with six carbons?
Ribose
Fructose
Glucose
Glycerol
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The Henderson-Hasselbalch equation relates pH to pKa and the ratio of base to acid in a buffer.
True
False
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An enzyme's active site can be described as a rigid lock that does not change shape upon substrate binding.
True
False
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Phospholipids in membranes can diffuse laterally within the same leaflet.
True
False
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Allosteric inhibitors typically bind to the active site of an enzyme.
False
True
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Beta-pleated sheets are stabilized by hydrogen bonds between side chains of adjacent residues.
True
False
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A Lineweaver-Burk plot is a double-reciprocal plot of which two variables?
v versus 1/[S]
1/v versus 1/[S]
1/v versus [S]
v versus [S]
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Which amino acid has an imidazole side chain with a pKa near physiological pH, making it a common acid-base catalyst?
Aspartate
Histidine
Lysine
Phenylalanine
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The isoelectric point (pI) of a peptide is the pH at which the peptide has what net charge?
-1
+1
Depends only on its N-terminus
0
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Which type of inhibition decreases Vmax without changing Km for the substrate?
Mixed that favors E
Uncompetitive
Competitive
Noncompetitive (pure)
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Which statement about Gibbs free energy is correct for a spontaneous process at constant T and P?
Delta G equals zero
Delta G is negative
Delta S must be positive
Delta H must be negative
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A Ramachandran plot displays allowed regions of which pair of backbone dihedral angles?
Theta and phi
Chi1 and chi2
Phi and psi
Omega and chi1
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Which statement correctly describes the effect of 2,3-BPG on adult hemoglobin?
It has no effect on O2 binding
It stabilizes the R state and increases O2 affinity
It stabilizes the T state and decreases O2 affinity
It covalently binds heme iron
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Which cofactor is a biotin-dependent carboxylation most likely to require?
PLP
NAD+
CO2 (as bicarbonate) and ATP
FAD
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During beta-oxidation, which step directly produces FADH2?
Reduction of NAD+ to NADH by hydroxyacyl-CoA dehydrogenase
Hydration of the double bond
Thiolysis to release acetyl-CoA
Oxidation of acyl-CoA to trans-delta2-enoyl-CoA by acyl-CoA dehydrogenase
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Which statement about oxidative decarboxylation of pyruvate by the pyruvate dehydrogenase complex is correct?
It consumes NADH and CO2
It is activated by high NADH/NAD+ ratio
It occurs in the cytosol
It produces acetyl-CoA, CO2, and NADH
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0

Study Outcomes

  1. Analyze the chemical structures and functions of carbohydrates, lipids, proteins, and nucleic acids.
  2. Apply metabolic pathways to explain energy production and storage in cellular processes.
  3. Evaluate the role of vitamins and coenzymes in enzymatic reactions and regulation.
  4. Integrate knowledge of molecular metabolism with cellular and subcellular processes to understand organismal regulation.

Introductory Biochemistry Additional Reading

Here are some top-notch academic resources to supercharge your biochemistry studies:

  1. This comprehensive course delves into the chemistry and metabolism of biomolecules, complete with lecture videos, problem sets, and exams to test your knowledge.
  2. Explore the molecules of life through this self-paced course, covering everything from protein structures to metabolic pathways, all taught by esteemed Harvard professors.
  3. This course examines the chemical and physical properties of cells, focusing on protein structures, catalysis principles, and metabolic pathways, complete with lecture videos and problem sets.
  4. Access a series of video lectures focusing on metabolism, including topics like glycolysis, the TCA cycle, and oxidative phosphorylation, to enhance your understanding of biochemical processes.
  5. Supplement your learning with curated readings from renowned biochemistry textbooks, aligning with lecture topics to deepen your comprehension.
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