Cell Size AP Bio

Front

What is the SA:V ratio?

Back

The surface area to volume ratio (SA:V ratio) is a measure that describes how much surface area is available for exchange relative to the volume of the cell.

Front

Why is a high SA:V ratio important for cells?

Back

A high SA:V ratio allows for more efficient exchange of materials (like nutrients and waste) across the cell membrane.

Front

What happens to the SA:V ratio as a cell increases in size?

Back

As a cell increases in size, its volume increases faster than its surface area, leading to a lower SA:V ratio.

Front

Calculate the SA:V ratio for a cube with a side length of 2 cm.

Back

SA:V ratio = Surface Area (24 cm²) / Volume (8 cm³) = 3.0.

Front

What is the effect of cell shape on SA:V ratio?

Back

Different shapes can affect the SA:V ratio; for example, elongated or flattened cells can have a higher SA:V ratio compared to spherical cells.

Front

What is the relationship between cell size and diffusion?

Back

Larger cells may have difficulty with diffusion due to a lower SA:V ratio, making it harder for materials to enter and exit the cell.

Front

Define 'surface area' in the context of cells.

Back

Surface area refers to the total area of the cell membrane that is available for exchange with the environment.

Front

Define 'volume' in the context of cells.

Back

Volume refers to the space occupied by the cell's contents, which includes organelles and cytoplasm.

Front

What is one consequence of a low SA:V ratio in cells?

Back

A low SA:V ratio can lead to insufficient nutrient uptake and waste removal, potentially harming the cell.

Front

How does the SA:V ratio affect metabolic rates in cells?

Back

Cells with a higher SA:V ratio typically have higher metabolic rates due to more efficient exchange of materials.