#receptors

Dictyostelium

cAMP receptors classified as:

cAMP receptors cAR1 through cAR4 are classical seven-transmembrane heterotrimeric G protein-coupled receptors with high homology to mammalian chemoattractant receptors. They couple to G alpha 2 and G beta-gamma complexes activating multiple effectors including adenylyl cyclase, phospholipase C, PI3K, and MAPK, coordinating chemotaxis and gene expression. They are not ligand-gated ion channels, receptor tyrosine kinases that autophosphorylate, or nuclear hormone receptors residing intracellularly. cAR1 possesses highest affinity, rapidly desensitizes, and establishes oscillatory dynamics essential for wave propagation. Gene disruption of cAR1 abolishes aggregation and chemotactic streaming during starvation.

Ref: NCBI Gene, Dictyostelium cAR1 as GPCR - seven transmembrane and heterotrimeric G protein chemotaxis signaling.

View Details

A Cell Signaling

Proteins with intrinsic tyrosine kinase activity do NOT act as receptors for

Transferrin, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Cell Signaling ELR Pathways - I

ELRs are best described as receptors that

initiate signaling by enzymatic phosphorylation, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Cell Signaling Fundamental PrinciplesI

Inputs to cell signaling include

all of these, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Cell Signaling Fundamental Principles

Hydrophobic ligands usually bind to

Hydrophilic ligands cannot cross the plasma membrane and therefore bind cell-surface receptors that transmit the signal into the cell. Hydrophobic ligands such as steroid hormones readily diffuse across the bilayer and bind intracellular receptors that often function as ligand-activated transcription factors. This physicochemical distinction dictates the location and primary mechanism of receptor action.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Cell Signaling Fundamental Principles

GPCRs primarily signal through

second messengers, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Endocrinology

Hormones generally act on target cells by binding to:

Answer: B) Specific receptors. For Endocrinology, once you lock onto the key mechanism or definition, Specific receptors is the clear fit. If you restate the concept in your own words, Specific receptors is the option that correctly names the structure, process, or principle asked for in Endocrinology. So Specific receptors is the clean, accurate selection. If a similar stem appears later, start from the same core fact and you will land on the same kind of answer. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other. When you practise, cover the choices first, write Specific receptors from memory, then reveal the letter — that habit builds real recall for Endocrinology.

Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.

View Details