Cell Nutrition & Transport

The diagram is a model of one way that materials move into a cell. Which sentence explains what happens in the last step?

• A vacuole carries particles into the cell.
• Transport proteins push particles out of the cell.
• Phospholipids in the cell membrane allow particles to pass through.

A tea bag can model a cell. The fabric of the bag represents the cell membrane. In part of the model, materials move out of the bag and into the water. Which cell process does this best model?

• Transport proteins using energy to push large molecules across the cell membrane.
• Small molecules easily passing between the phospholipids in the cell membrane.
• Substances moving from an area of low concentration to an area of high concentration.

The diagram is a model of one way that materials move into a cell. Which sentence explains what happens in the first step of the process shown?

• Transport proteins push particles into and out of the cell.
• The vacuole opens and releases particles from the cell.
• The cell membrane surrounds particles outside the cell.

Which 2 statements describe a way that an other-feeder gets food?

• A pine tree carries out photosynthesis.
• Paramecia sweep food into mouthlike openings.
• A bear eats the fish that it catches.

Which 2 statements summarize a way that a self-feeder gets food?

• Sphagnum moss takes in energy from sunlight.
• Bacteria take in food that has already been digested by a person.
• Euglenas carry out photosynthesis.

Which 2 statements summarize a way that an other-feeder gets food?

• Euglenas carry out photosynthesis.
• Paramecia sweep food into mouthlike structures.
• Bacteria take in food that has already been digested by a person.

Which statement best explains the functions of mitochondria?

• They store excess nutrients and water until the cell can use them.
• They use energy from sunlight to change inorganic matter into organic matter.
• They use food molecules to make a usable form of energy for cell activities.

Which statement best explains how mitochondria help a cell get the materials it needs?

• They push particles against their natural direction of flow.
• They convert energy stored in organic compounds into a usable form.
• They provide instructions needed to make proteins from amino acids.

Which statement best explains how a chloroplast helps a cell get the materials it needs?

• It uses energy from sunlight to change inorganic matter into organic matter.
• It converts energy stored in organic compounds into a form the cell can use.
• It stores excess nutrients and water until they are needed.

Which statement best explains a way in which a cell gets rid of wastes?

• Mitochondria change energy stored in organic compounds into a usable form.
• A chloroplast converts energy from sunlight into organic matter.
• Vacuoles merge with the cell membrane and then open.