Q43. Match the proteins in Group 1 with their correct functions in Group 2
| Group 1 | Group 2 |
|---|---|
| P. Shaker protein Q. Bacteriorhodopsin R. Porin S. ABC transporter |
1. Inner membrane receptor 2. Active transport 3. Voltage gated K+ channel 4. Light driven H+ pump 5. Membrane fusion 6. β-barrel simple diffusion channel |
Shaker protein functions as a voltage-gated K+ channel, while bacteriorhodopsin pumps protons using light, porin enables passive diffusion as a β-barrel, and ABC transporters perform active transport. The correct matching for this GATE Life Sciences-style question is option (D).
Group 1-Group 2 Matches
-
P. Shaker protein → 3. Voltage gated K+ channel: Shaker is the classic Drosophila voltage-gated potassium channel that opens with depolarization to repolarize membranes.
-
Q. Bacteriorhodopsin → 4. Light driven H+ pump: This archaeal protein uses retinal to actively pump H+ across membranes upon light absorption.
-
R. Porin → 6. β-barrel simple diffusion channel: Outer membrane porins form β-barrel pores for passive diffusion of small hydrophilic molecules.
-
S. ABC transporter → 2. Active transport: ATP-binding cassette transporters use ATP hydrolysis for active import/export across membranes.
Option Analysis
Option (A): P-4, Q-2, R-3, S-5
Incorrect. P (Shaker) mismatches light-driven pump (4, that’s bacteriorhodopsin); R (porin) mismatches K+ channel (3); S mismatches fusion (5, unrelated).
Option (B): P-5, Q-3, R-4, S-6
Incorrect. P mismatches fusion (5); Q mismatches K+ channel (3); R mismatches H+ pump (4).
Option (C): P-6, Q-1, R-5, S-4
Incorrect. P mismatches β-barrel (6); Q mismatches inner receptor (1); R mismatches fusion (5).
Option (D): P-3, Q-4, R-6, S-2
Correct, as matches align precisely with protein functions.
Shaker protein bacteriorhodopsin porin ABC transporter questions test membrane protein functions in GATE Life Sciences PYQs, matching Group 1 (P-Q-R-S) to roles like voltage gated K+ channel and active transport.
Key Functions
Shaker protein acts as voltage gated K+ channel for neuronal repolarization. Bacteriorhodopsin serves as light driven H+ pump in archaea. Porin forms β-barrel simple diffusion channel in bacterial outer membranes. ABC transporter enables active transport via ATP binding.
PYQ Solving Tips
Eliminate mismatches: Voltage sensitivity points to Shaker (3); light absorption to bacteriorhodopsin (4); β-structure to porin (6); energy use to ABC (2).
| Group 1 | Correct Group 2 | Key Feature |
|---|---|---|
| P. Shaker protein | 3. Voltage gated K+ channel | Depolarization-activated |
| Q. Bacteriorhodopsin | 4. Light driven H+ pump | Retinal-based |
| R. Porin | 6. β-barrel simple diffusion channel | Passive pores |
| S. ABC transporter | 2. Active transport | ATP-powered |
Master these for CSIR NET too—focus on structural/functional distinctions.
