Cell Transport and Energy

Which structure is most directly responsible for maintaining homeostasis in all cells?

• chloroplast
• cell wall
• plasma membrane
• vacuole

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

• salt is 5% inside the cell and 1% outside the cell

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

• salt was 5% outside the cell and 1% inside the cell

• water and protein was equal inside and outside the cell

A freshwater plant is placed in a container  of saltwater. What will most likely happen  to the cells of the plant?

• They will swell because water will move into them.
• They will swell because salt will move into them.
• They will shrink because water will move out of them.
• They will shrink because salt will move out of them.

The process of active transport requires the most  direct use of what?

• carbon dioxide
• amino acids
• ATP
• glucose

Under which condition will the cell experience a net loss of water to its environment?

• A cell with 1% salt inside in an environment with 5% water

• A cell with 5% salt inside an environment with 1% water

• A cell with 95% water in an environment with 95% water

• A cell with 90% water in an environment with 90% water

In which situation would passive transport most likely be used to remove a substance from inside a cell? 

• when the substance is composed of positive ions
• when the concentration of the substance is lower outside the cell than inside the cell
• when the substance is composed of large protein molecules
• when the concentration of the substance is higher outside the cell than inside the cell

If an animal cell is placed in distilled water, it will swell and burst. The bursting of the cell is a result of which biological process?

• active transport
• enzyme activity
• respiration
• osmosis

Which term describes the maintenance of a steady internal state in the body?

• homeostasis
• gametogenesis 
• mitosis
• respiration

If energy is needed to move materials into or out of a cell, what is most likely occurring? 

• passive transport
• osmosis 
• diffusion
• active transport

Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?

• Substances are moving rapidly across the cell membrane.
• ATP is being rapidly consumed near the cellular membrane.
• Substances are moving from high to low concentration.
• Substances are moving through channels in the cell membrane.