LSM2106: pass the exams, not just read the notes
Your complete guide to National University of Singapore's fundamental biochemistry course. See where the marks are, work real practice questions, and study with an AI tutor that knows LSM2106.
Sia generates LSM2106 practice questions, walks through water and non-covalent forces step by step, and quizzes you on the material the exam weights most heavily.
Worked example
An enzyme-catalysed reaction is measured with and without an inhibitor. With inhibitor, the apparent Km rises but Vmax is unchanged. What kind of inhibition is this, and what does it imply about the binding site?
Read the two parameters separately. Vmax unchanged means the enzyme can still reach full catalytic rate; Km increased means more substrate is needed to reach half that rate, so apparent affinity has fallen.
State the structural implication. Competition for a single site means the inhibitor binds the active site itself, typically because it resembles the substrate. That is why this pattern is diagnostic of structure and not merely of rate.
Check the alternatives against the data. Non-competitive inhibition lowers Vmax with Km unchanged; uncompetitive lowers both; irreversible inhibition reduces the effective enzyme concentration and lowers Vmax. None of these matches unchanged Vmax with raised Km.
The trap: Reading the two parameters as one signal — noticing that the reaction is slower and picking whichever inhibition type comes to mind. Km and Vmax move independently, and the pattern of which one changes is precisely what identifies the mechanism. The second common error is assuming a slower reaction must mean a lower Vmax, when at sub-saturating substrate a competitive inhibitor slows the observed rate while leaving the true Vmax intact. classic slip!
One exam decides 54% of your grade. Summative. This whole page is built around that.
Overview
What LSM2106 is, and where it sits
LSM2106 is the NUS Department of Biochemistry's foundation course, and the official objective is explicit about the standard it sets: to provide a firm and rigorous foundation in current concepts of the structure and functions of biomolecules in molecular cellular biology, on the grounds that these concepts underlie almost all recent advances in the biological and biomedical sciences.
The teaching approach is stated too — lectures introduce various cellular organelles as models for understanding how classes of biomolecules participate in important cellular processes. The syllabus works through five areas: the fundamental forces and chemicals in cells, the structures and functions of cellular proteins, cellular enzymes, cellular metabolism, and cellular membranes and nucleic acids.
Two things make this course demanding. It is the only course in our Singapore set with a dual entry requirement — biology and chemistry — because it genuinely needs both. And it carries eleven published learning outcomes, several of which ask for integration across topics and disciplines rather than mastery of any one. With 54% of the grade in the final examination, that integrative demand arrives all at once.
Official outline: dbs.nus.edu.sg · LSM2106 outline. Always treat the official outline and the exam timetable as authoritative.
Difficulty & time commitment
Is LSM2106 hard, and how much time does it take?
LSM2106 is manageable if you keep a weekly rhythm and treat the back half as the main event. The pattern is consistent: it starts gently and steepens, and the heaviest assessment is the part that separates grades.
The difficulty curve and the assessment weighting point the same way: the back half is harder and worth more. Front-loading effort there is the highest-return decision in the course.
Is this course for you
Who tends to do well, and who tends to struggle
You will likely do well if
- Your chemistry is solid. The dual prerequisite is not a formality, and the whole course reasons from chemical principles.
- You explain function from structure rather than memorising each separately.
- You can work enzyme kinetics problems numerically and interpret what each parameter change means mechanistically.
- You start final examination preparation early, since 54% arrives in one sitting.
You may struggle if
- You treat the five syllabus areas as separate subjects. Several learning outcomes explicitly ask you to integrate them.
- You memorise metabolic pathways as sequences of names without their regulation and purpose.
- You read kinetics rather than working problems; the parameter logic only becomes clear by calculation.
- You dismiss the practical work because it is 6%, when its concepts are examinable in the final.
- For every biomolecule class, be able to state how its structure produces its function in one sentence. That mapping is the course's central demand.
- Build a kinetics decision table: which parameter moves under competitive, non-competitive, uncompetitive and irreversible inhibition. Recognising the pattern is worth more than deriving it.
- Learn metabolism by regulation points rather than by step sequence — where the flux is controlled and by what signal.
- Connect the practical techniques to the concepts they measure; a learning outcome asks for exactly that connection.
Syllabus
The 12 topics, topic by topic
The exam-weight marker on each topic shows where the marks concentrate. The amber topics carry the highest exam weight.
T1 · Water, acids, bases and buffers
Official DBS syllabus, item 1The chemistry of the cellular medium and why buffering matters biologically.
T2 · Non-covalent forces, hydrogen bonds and amphiphiles
Official DBS syllabus, item 1The weak interactions that determine biomolecular form, and methods used to analyse them.
T3 · Amino acids and protein biosynthesis
Official DBS syllabus, item 2Amino acid structures and properties, and how proteins are built.
T4 · Protein shape, domains, motifs and families
Official DBS syllabus, item 2The levels of protein structure and how domains and motifs define families.
T5 · Post-translational modification, folding and dynamics
Official DBS syllabus, item 2How proteins are modified after synthesis, and how they fold and move within cellular compartments.
T6 · Enzyme form, function and kinetics
Official DBS syllabus, item 3How enzymes accelerate reactions, and the kinetic description of that acceleration.
T7 · Inhibition, regulation and cellular oxygenation
Official DBS syllabus, item 3Cellular and pharmacological inhibitors, regulation of enzyme activity, and oxygen handling.
T8 · Carbohydrates and mitochondrial bioenergetics
Official DBS syllabus, item 4Carbohydrate structure and function, and how mitochondria produce usable energy.
T9 · Integrating catabolism and anabolism
Official DBS syllabus, item 4Oxidative and non-oxidative metabolism, and how breakdown and synthesis are balanced.
T10 · Regulation of metabolic pathways and signal transduction
Official DBS syllabus, item 4A systems view of how metabolic pathways are organised and regulated, and how signals are transmitted.
T11 · Lipids, membranes and membrane transport
Official DBS syllabus, item 5Lipid structure and function, membrane organisation, and how material crosses it.
T12 · Nucleic acids, replication and repair
Official DBS syllabus, item 5Nucleic acid structure and function, DNA replication, repair and manipulation.
How it's assessed
Assessment structure
| Component | Weight | Format & timing |
|---|---|---|
| Final examination | 54% | Final examination covering the course. NUS examination period. Summative. |
| Quizzes and tests | 40% | Continual assessment through quizzes and tests across the semester. Across the semester. Continual assessment. |
| Laboratory tests | 6% | Laboratory assessment tied to the hands-on practical sessions. Across the semester. Continual assessment. |
- The three components sum to 100. No separate component hurdle is published.
- The 54% final is the largest single component in our Singapore set outside LSM2212. Laboratory tests carry only 6%, but a published learning outcome asks students to appreciate how hands-on practical sessions and basic laboratory techniques connect to applications in biotechnology and medical sciences, so the practical material is examinable well beyond its own weighting.
This is an exam-cram course. With the exams at 54% of the grade and the final examination alone at 54%, your result is overwhelmingly decided by how well you perform under time pressure. Summative.
Final exam timing: During the NUS examination period. Confirm the exact date and venue on the official exam timetable.
How to actually pass it
A weekly rhythm, two checklists, and the traps to avoid
The course rewards consistency over cramming, and practice over re-reading. Here is the loop that works, then what to have nailed before each exam.
The weekly loop
Before the mid-semester checklist
- Explain how water, pH and buffering shape the cellular environment.
- Describe the non-covalent forces that determine biomolecular structure.
- Explain amino acid properties, protein biosynthesis and the levels of protein structure.
- Account for post-translational modification, folding and protein dynamics in cellular compartments.
Before the final heaviest topics
- Analyse enzyme kinetics and identify inhibition type from parameter changes.
- Explain regulation of enzyme activity and cellular oxygenation.
- Trace carbohydrate metabolism and mitochondrial bioenergetics, and explain how catabolism and anabolism are integrated and regulated.
- Describe lipid and membrane structure, membrane transport, and nucleic acid structure, replication and repair.
The mistakes that cost marks
Reading Km and Vmax together. They change independently, and which one moves is what identifies the inhibition mechanism. Treating a slower reaction as one undifferentiated signal loses the diagnosis.
Pathways as name sequences. Metabolism is examined on regulation and integration. Knowing the order of intermediates without the control points answers the wrong question.
Separating structure from function. The course's stated objective is understanding function through structure. Answers that describe one without deriving the other miss the point.
Neglecting the chemistry. Buffers, thermodynamics and non-covalent interactions are assumed, not taught from scratch. Weakness here compounds through every later topic.
Teaching team
Who teaches LSM2106
The bios below are factual. We do not rate lecturers; any star ratings are submitted by students who have taken LSM2106.
Assoc Prof Deng Lih Wen
Assoc Prof Adrian Teo
Teaching team as listed in the course materials reviewed. AskSia does not rate lecturers; star ratings are submitted by students who have taken LSM2106.
Formula & concept sheet
The vocabulary and formulas you must own
- Buffer
- A weak acid and its conjugate base resisting pH change; the basis of physiological pH stability.
- Non-covalent interaction
- Hydrogen bonds, ionic interactions, van der Waals forces and the hydrophobic effect, which together determine biomolecular conformation.
- Amphiphile
- A molecule with both hydrophilic and hydrophobic regions, whose self-assembly forms micelles and membranes.
- Protein domain
- An independently folding structural and functional unit; shared domains define protein families.
- Post-translational modification
- Covalent alteration of a protein after synthesis, expanding its functional and regulatory range.
- Michaelis constant (Km)
- The substrate concentration at half maximal velocity; an inverse indicator of apparent substrate affinity.
- Vmax
- The maximal rate of an enzyme-catalysed reaction at saturating substrate.
- Competitive inhibition
- Inhibition by active-site binding, raising apparent Km while leaving Vmax unchanged.
- Allosteric regulation
- Modulation of enzyme activity by ligand binding at a site distinct from the active site.
- Bioenergetics
- The thermodynamics of energy capture, storage and use in cells, centred on mitochondrial ATP production.
- Catabolism and anabolism
- The breakdown of molecules to release energy, and the biosynthesis that consumes it; integrated and reciprocally regulated.
- Membrane transport
- Movement of material across the lipid bilayer by passive diffusion, facilitated transport or active pumping.
Common acronyms: ATP · Km · PTM · Vmax.
Where it fits
Prerequisites, related courses & why it matters
Dual entry requirement published by NUS: GCE A-Level or H2 Biology or equivalent or LSM1301, and GCE A-Level or H2 Chemistry or equivalent or CM1417 or CM1417X. Worth 4 units, offered in both semesters by the Department of Biochemistry. It is the prerequisite for a large part of the Biomedical Science pathway, including LSM3210A/B Metabolism and Regulation, LSM3211 Fundamental Pharmacology, LSM3231 Protein Structure and Function and LSM3243 Molecular Biophysics.
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FAQ
Frequently asked questions
Is LSM2106 hard?
It rates moderately hard, and it is the most demanding of the Level 2 life sciences courses we cover. It requires both biology and chemistry backgrounds, places 54% of the grade in the final, and expects integration across topics rather than topic-by-topic mastery.
What is the assessment breakdown?
54% final examination, 40% quizzes and tests, and 6% laboratory tests.
What do I need before taking it?
Both biology and chemistry: GCE A-Level or H2 Biology or equivalent or LSM1301, and GCE A-Level or H2 Chemistry or equivalent or CM1417 or CM1417X. It is the only course in our Singapore set with a dual requirement.
Who teaches it?
The published course coordinators are Assoc Prof Deng Lih Wen in Semester 1 and Assoc Prof Adrian Teo in Semester 2.
Why are the laboratory tests only 6%?
The weighting is small, but a published learning outcome asks students to appreciate how hands-on practical sessions and basic laboratory techniques relate to applications in biotechnology and medical sciences. That material can be examined in the final, so the practical work matters more than 6% suggests.
What is the hardest part?
Usually metabolism — integrating catabolism and anabolism and taking a systems view of pathway regulation. Enzyme kinetics is more technically demanding but more self-contained; metabolism is where the course asks you to hold many pathways in view at once.
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