Molecular Transport HHS

If the external environment of a living cell has a greater concentration of salt than the cytoplasm within the cell, the cell will tend to

• divide

• increase its size

• lose water

• excrete salt

The net flow of materials through the membrane of a cell against a concentration gradient is known as

• active transport

• passive transport

• circulation

• transpiration

Water and minerals move from the soil into a plant by the process of

• diffusion, only

• active transport, only

• passive transport and hydrolysis

• both diffusion and active transport

Which process would include a net movement of sugar molecules through a membrane from a region of lower concentration to a region of higher concentration?

• osmosis

• cyclosis

• active transport

• passive transport

A red blood cell placed in distilled water will swell and burst due to the diffusion of

• salt from the red blood cell into the water

• water into the red blood cell

• water from the blood cell into its environment

• salt from the water into the red blood cell

Red blood cells contain a higher concentration of potassium than the surrounding blood plasma does. This higher concentration is maintained by the process of

• cyclosis

• osmosis

• simple diffusion

• active transport

Since cyanide is a poison that limits a cell's ability to manufacture ATP, a cell containing cyanide is least likely to carry on the process of

• passive transport

• active transport

• osmosis

• diffusion

The process of osmosis would explain the net movement of water into a cell if the percentage of

• water was 90% inside the cell and 95% outside the cell

• protein was 30% inside the cell and 35% outside the cell

• water was 95% inside the cell and 90% outside the cell

• water and protein was equal inside and outside the cell

The end products of digestion enter the cells of vertebrate by the process of

• absorption

• osmosis

• emulsification

• egestion

Human red blood cells placed in a 2% salt solution appear to shrink, but those placed in a 0.4% salt solution burst. Which statement best supports these observations?

• Salt causes cell walls to swell.

• Salt is actively transported across cell membranes.

• The nucleus does not regulate water balance in a cell.

• Osmosis may occur in either direction across the cell membrane.