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2.1 Supplying the cell

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Question 89

Dinitrophenol (DNP) is a metabolic poison that acts as a mitochondrial uncoupler, preventing the synthesis of ATP while allowing electron transport to continue. If a sample of mammalian ileum epithelial cells is treated with DNP, which of the following transport processes across the cell-surface membrane will be directly inhibited due to the sudden loss of ATP production?

A

The co-transport of glucose and sodium ions (Na+\text{Na}^+Na+) into the cell through SGLT1

B

The passive movement of water through aquaporins down a water potential gradient

C

The active transport of sodium ions (Na+\text{Na}^+Na+) out of the cell via the sodium-potassium pump

D

The facilitated diffusion of glucose out of the cell via GLUT2 carrier proteins

Markscheme

2.1 Supplying the cell Questions

  1. GCSE
  2. /Biology
  3. /2.1 Supplying the cell

194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.

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