Study Guide For
High-Yield Concepts for
NBME CBSE
** Expert-Verified Explanation
** Questions with Verified Answer
** New Edition | 2026-2027 Updated
** 100% Guaranteed Pass
** 100% Correct Answers
,Cell Cycle Phases G1 → S → G2 → M
G1/S Checkpoint Controlled by Rb protein
G2/M Checkpoint Controlled by p53 protein
p53/p21 Tumor suppressors
Cyclins/CDKs Regulate progression of the cell cycle
Rb phosphorylation Promotes cell cycle progression
Bioavailability (F) Fraction of drug reaching systemic circulation
Half-life (t½) t½ = 0.693 × Vd / CL
Volume of Distribution (Vd) Increases for lipophilic drugs
Clearance (CL) CL = Rate of elimination / [Drug]
Loading Dose (LD) LD = Cp × Vd / F
Maintenance Dose (MD) MD = Cp × CL × τ / F
Agonists Bind and activate receptors
Antagonists Block receptors
Competitive Antagonists Cause a right shift in the dose-response curve, same maximum effect
Noncompetitive Antagonists Decrease maximum effect of the agonist
,Efficacy Maximum response of a drug, higher is better
Potency Dose needed for a drug to achieve its effect, higher means lower dose required
Michaelis-Menten Curve Describes the rate of enzymatic reactions
Km Concentration of substrate at half of Vmax
Competitive Inhibitors Increase Km, do not affect Vmax
Noncompetitive Inhibitors Decrease Vmax, do not affect Km
cAMP (Gs) Involved in signaling pathways for β1/2, H2, D1, TSH, PTH, ACTH, FSH, LH
IP3 (Gq) Involved in signaling pathways for α1, M1/3, H1, GnRH, TRH
Tyrosine Kinase (RTK) Signaling pathway for Insulin, IGF-1, FGF
JAK-STAT Pathway Signaling pathway for GH, Prolactin, EPO, G-CSF
CD4⁺ T Cells Subtypes include TH1, TH2, TH17, and Treg, each with specific functions in
immune response.
TH1 Activates macrophages through IL-12 leading to IFN-γ production.
TH2 Activates eosinophils and promotes IgE production via IL-4, IL-5, and IL-13.
TH17 Recruits neutrophils through IL-17.
Treg Suppresses immune responses using IL-10 and TGF-β.
CD8⁺ T Cells Responsible for cytotoxic killing via perforin/granzymes or FasL.
, B Cell Activation Requires CD40-CD40L interaction and IL-4/IL-5 from CD4⁺ T cells.
Class Switching The process where B cells change the class of antibody they produce, influenced
by cytokines.
IL-4 Promotes class switching to IgE and IgG.
IL-5 Promotes class switching to IgA.
Antibody Types Includes IgM, IgG, IgA, IgE, and IgD, each with distinct functions.
IgM The first antibody produced; exists as a pentamer.
IgG The most abundant antibody in circulation; can cross the placenta.
IgA Provides mucosal immunity.
IgE Involved in allergic reactions and defense against parasites.
IgD Function is unclear.
Classic Pathway Activation of the complement system via IgG or IgM leading to C1 activation.
Alternative & Lectin Pathways Complement activation triggered directly by microbial components.
C3b Acts as an opsonin in the complement system.
C5a Functions in neutrophil chemotaxis.
MAC (C5b-C9) Forms a membrane attack complex leading to cell lysis.
C1 esterase inhibitor deficiency Causes hereditary angioedema.
High-Yield Concepts for
NBME CBSE
** Expert-Verified Explanation
** Questions with Verified Answer
** New Edition | 2026-2027 Updated
** 100% Guaranteed Pass
** 100% Correct Answers
,Cell Cycle Phases G1 → S → G2 → M
G1/S Checkpoint Controlled by Rb protein
G2/M Checkpoint Controlled by p53 protein
p53/p21 Tumor suppressors
Cyclins/CDKs Regulate progression of the cell cycle
Rb phosphorylation Promotes cell cycle progression
Bioavailability (F) Fraction of drug reaching systemic circulation
Half-life (t½) t½ = 0.693 × Vd / CL
Volume of Distribution (Vd) Increases for lipophilic drugs
Clearance (CL) CL = Rate of elimination / [Drug]
Loading Dose (LD) LD = Cp × Vd / F
Maintenance Dose (MD) MD = Cp × CL × τ / F
Agonists Bind and activate receptors
Antagonists Block receptors
Competitive Antagonists Cause a right shift in the dose-response curve, same maximum effect
Noncompetitive Antagonists Decrease maximum effect of the agonist
,Efficacy Maximum response of a drug, higher is better
Potency Dose needed for a drug to achieve its effect, higher means lower dose required
Michaelis-Menten Curve Describes the rate of enzymatic reactions
Km Concentration of substrate at half of Vmax
Competitive Inhibitors Increase Km, do not affect Vmax
Noncompetitive Inhibitors Decrease Vmax, do not affect Km
cAMP (Gs) Involved in signaling pathways for β1/2, H2, D1, TSH, PTH, ACTH, FSH, LH
IP3 (Gq) Involved in signaling pathways for α1, M1/3, H1, GnRH, TRH
Tyrosine Kinase (RTK) Signaling pathway for Insulin, IGF-1, FGF
JAK-STAT Pathway Signaling pathway for GH, Prolactin, EPO, G-CSF
CD4⁺ T Cells Subtypes include TH1, TH2, TH17, and Treg, each with specific functions in
immune response.
TH1 Activates macrophages through IL-12 leading to IFN-γ production.
TH2 Activates eosinophils and promotes IgE production via IL-4, IL-5, and IL-13.
TH17 Recruits neutrophils through IL-17.
Treg Suppresses immune responses using IL-10 and TGF-β.
CD8⁺ T Cells Responsible for cytotoxic killing via perforin/granzymes or FasL.
, B Cell Activation Requires CD40-CD40L interaction and IL-4/IL-5 from CD4⁺ T cells.
Class Switching The process where B cells change the class of antibody they produce, influenced
by cytokines.
IL-4 Promotes class switching to IgE and IgG.
IL-5 Promotes class switching to IgA.
Antibody Types Includes IgM, IgG, IgA, IgE, and IgD, each with distinct functions.
IgM The first antibody produced; exists as a pentamer.
IgG The most abundant antibody in circulation; can cross the placenta.
IgA Provides mucosal immunity.
IgE Involved in allergic reactions and defense against parasites.
IgD Function is unclear.
Classic Pathway Activation of the complement system via IgG or IgM leading to C1 activation.
Alternative & Lectin Pathways Complement activation triggered directly by microbial components.
C3b Acts as an opsonin in the complement system.
C5a Functions in neutrophil chemotaxis.
MAC (C5b-C9) Forms a membrane attack complex leading to cell lysis.
C1 esterase inhibitor deficiency Causes hereditary angioedema.
