Cell Transport

Identify substance A.

• Salt
• Glucose
• Water
• Iodine

Identify one likely substance in the environment of the cell that caused this response.  

• Salt Water

• Fresh Water
• Distilled Water
• Pond Water

Methods A & B are classified as passive transport because they do not require

• ATP
• Carbon Dioxide
• Light
• DNA

Why does the movement of molecules in Method C represent active transport?

• The molecules are moving down.
• The molecules are moving inside the cell.
• The molecules are moving from high to low concentration.
• The molecules are moving from low to high concentration.

The process used to remove the excess water from the paramecium by the contractile vacuole is

• Synthesis

• Digestion

• Active Transport

• Passive Transport

The student predicted that the contractile vacuole would contract fewer times in one minute in a solution that had a higher concentration of salt than that found in typical pond water. This prediction is most likely

• Correct, because a high concentration of salt in the environment will force water into the cell, causing the contractile vacuole to pump

• Incorrect, because salt would be entering the cell, and the contractile vacuole would have to pump it out

• Incorrect, because the concentration of salt in the environment should not affect a cell

• Correct, because water would be moving out of the cell into the salt solution

If the concentration of sodium is greater outside a cell than inside the cell, which process could move sodium out of the cell?

• Diffusion
• Carbohydrate synthesis
• Active transport
• Digestion

Red onion cells undergo the change represented in the diagram shown.

This change is most likely caused by the cell being transferred from

• Distilled water to starch indicator
• Distilled water to salt water
• Salt water to tap water
• Salt water to distilled water

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

The diagram represents a laboratory technique. What is one reason why a student would use this technique during a scientific investigation?

• To add cells to a slide

• To fix the coverslip
• To remove stain from the slide
• To add salt water to the slide

Which statement is best supported by the diagram?

• Oxygen molecules entered the cell over time by active transport.
• Water molecules are too large to enter or leave the cell, so they remained where they were at the start of the investigation.
• Protein molecules are kept inside of the cell because the cell needs them.
• The protein molecules are too large to diffuse out of the cell.