CHS Transport

There are two main ways in which molecules are transported into and out of cells - active transport and passive transport. Which of the following statements is true of passive transport?

• Carrier proteins are sometimes used during passive transport

• Energy, in the form of ATP, is essential for passive transport

• Endocytosis and exocytosis are two forms of passive transport

• Molecules move up a concentration gradient during passive transport

Which conclusion can be drawn from the diagram above?

• Only water molecules move into the cell by diffusion

• only glucose molecules move into the cell by active transport

• both water molecules and glucose move into the cell by diffusion

• both water molecules and glucose move into the cell by active transport

Which process is an example of facilitated transport

• A protein embedded in the cell membrane allows a specific type of protein to move to a region of lower concentration

• The cell membrane wraps around a large molecule and forms a vesicle that takes the molecule into the cytoplasm

• Waste materials from cellular processes are moved to a region of higher concentration outside the cell

• A carrier protein moves water across the cell membrane against the concentration gradient

Which type of cellular transport requires a cell to use energy?

• diffusion

• facilitated transport

• active transport

• osmosis

In diagram 3, water is flowing by osmosis because the concentration of water

• Forces waste products to leave the cell

• Outside the cell is lower than in the surrounding solution

• It is the same both inside and outside the cell

• Inside the cell is higher than the surrounding solution

Which is a way that exocytosis differs from the pumping of calcium ions against a concentration gradient?

• Exocytosis does not involve carrier proteins

• Exocytosis occurs with the concentration gradient

• Exocytosis requires an expenditure of energy by the cell

• Exocytosis is a form of passive transport

What is the name of the macromolecule that makes up the majority of the cell membrane?

• nucleotide

• lipid

• carbohydrate

• protein

The structure most responsible for maintaining cell homeostasis is the cytoplasm

• cell wall

• mitochondria

• plasma membrane

A cell moves particles from a region of low concentration to a region of high concentration by:

• Facilitated diffusion

• osmosis

• passive transport

• active transport

Which picture shows a cell that was in a hypotonic solution?

• A

• B

• C