Question 1

What are the main types of transport in cells covered in the AQA GCSE Biology curriculum?

Accepted Answer

In the AQA GCSE Biology curriculum, the main types of transport in cells include diffusion, osmosis, and active transport. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Osmosis is a specific type of diffusion involving water molecules moving across a semi-permeable membrane. Active transport requires energy to move substances against their concentration gradient, from a lower to a higher concentration.

Question 2

How does diffusion differ from active transport in cell biology?

Accepted Answer

Diffusion and active transport are both processes that move substances across cell membranes, but they differ significantly. Diffusion is a passive process that does not require energy, as it relies on the natural movement of particles from an area of higher concentration to an area of lower concentration. In contrast, active transport requires energy, usually in the form of ATP, to move substances against their concentration gradient, from an area of lower concentration to an area of higher concentration.

Question 3

Why is osmosis important for cells, according to the AQA GCSE Biology syllabus?

Accepted Answer

Osmosis is crucial for maintaining cell turgor, which is the pressure of the cell contents against the cell wall in plant cells. This process helps maintain the structural integrity of plant cells and is vital for the uptake of water. In animal cells, osmosis helps regulate the balance of water and solutes, ensuring that cells do not become too swollen or shriveled, which could impair their function.

Question 4

What role does the cell membrane play in transport processes?

Accepted Answer

The cell membrane is a selectively permeable barrier that regulates the movement of substances in and out of the cell. It plays a crucial role in transport processes by allowing certain molecules to pass through while blocking others. This selective permeability is essential for maintaining homeostasis within the cell, enabling processes like diffusion, osmosis, and active transport to occur efficiently.

Question 5

Can you explain how active transport is used in root hair cells?

Accepted Answer

In root hair cells, active transport is used to absorb mineral ions from the soil, which are often at a lower concentration outside the cell than inside. This process requires energy in the form of ATP because it involves moving ions against their concentration gradient. Active transport allows plants to take up essential nutrients necessary for growth and development, even when these nutrients are present in low concentrations in the soil.

Transport in Cells

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