Unit 2 Quiz 2: Size and Membrane Practice

As cells increase in size, the relative surface area to volume ratio increases and therefore the demand for internal resources increases as well.

• True
• False

Phospholipid heads contain an amino group and a glycerol. Phospholipid tails contain fatty acid chains.

• True
• False

Cellular metabolism depends on cell size.

• True
• False

If analyzing the membrane composition of an organism living in a cold climate, what would you expect to find?

• Long fatty acid chains to ensure the membrane is held together through hydrophobic interactions
• Branched fatty acid chains, which would ensure the membrane does not pull apart at the low temperatures
• Many saturated fatty acid chains to allow for the membrane to maintain its fluidity at low temperatures
• Many unsaturated fatty acid chains to prevent tight packing of the phospholipids at low temperatures

Examine the chart below. Which cell would be most efficient at exchanging material across its plasma membrane?

• Cell A
• Cell B
• Cell C
• Cell D

Phospholipids are ____________________________ which causes them to form a bilayer.

Plant cells have a(n) ____________________ that covers the plasma membrane and is composed of ___________________.

Cells tend to be __________________ because this means they have a __________________ SA:V ratio.

Describe the fluid mosaic model. What do “fluid” and “mosaic” refer to?

Use the image below to calculate the SA:V ratio of both cuboidal cells. Then, using your calculations, determine which cell would be more optimal for the exchange of materials.