Homeostasis and Cell Transport

The surface area/volume ratio is an important factor for one celled organisms. As a cell's volume grows, its surface area/volume ratio decreases, making it harder and harder to acquire enough nutrients via diffusion. Because of this, cells stop growing after reaching a certain size. After reaching this state, a one celled organism is likely to...

• enter into a spore state.

• continue to grow until it is so big it bursts.

• use mitosis to divide and create daughter cells.

• stop eating so that it shrinks and its surface area/volume ratio grows.

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Which process describes the ATP-requiring movement of extremely large substances out of a cell in pockets called vesicles?

• exocytosis

• endocytosis

• phagocytosis

• passive transport

Shaquan placed a potato slice in salt water. After some time he noticed that the slice of potato became limp. Why did this happen to the potato slice?

• The potato was getting old.

• The potato cells lost water to the surroundings.

• The potato cells gained water from the surroundings.

• The potato cells had no exchange of materials with the environment.

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All of these are methods by which a cell...

• maintains homeostasis.

• creates energy.

• removes wastes.

• reproduces.

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____________ is the process of taking material into the cell by means of infoldings of the cell membrane.

• Diffusion

• Enocytosis

• Exocytosis

• Infiltration

A red blood cell will shrink in size when placed in a more concentrated salt solution because of the passive process called...

• biosis.

• endocytosis.

• osmosis.

• mitosis.

Water's unique properties result from the fact that water...

• has such a small molecular mass.

• is a polar covalent molecule.

• is a small ionic compound.

• has a neutral pH.

A plant has been removed from its natural environment and placed into a body of water that contains a higher concentration of salt than the inside of each plant cell. The plant promptly wilts. This situation is most similar to which event?

• seaweed put into fresh water

• a land plant put into tap water

• a freshwater plant put into seawater

• a freshwater plant put into distilled water

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The movement of carbon dioxide out of cells and oxygen into cells can best be explained by which process?

• osmosis

• diffusion

• exocytosis

• active transport

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Some molecules are too big to pass through the phospholipid bilayer of the cell membrane. These molecules need to pass through ________________ that are embedded in the cell membrane.

• proteins

• ribosome

• cell wall

• carbohydrates

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