Re-test Cell Membrane and Transport

The cell membrane plays an essential role in the life of the cell. How does the cell membrane help maintain the health of the cell?

• It contains genetic information of the cell

• It provides support and protection for the cell

• It is where protein molecules are manufactured in a cell

• It regulates movement of materials in and out of cells

The cell membrane of red-blood cells will allow water, oxygen, carbon dioxide, and glucose to pass through. Because other substances are blocked from entering, this membrane is called ____________.

• Selectively permeable

• Impermeable

• Non-permeable

• Fully permeable

Study the diagram of the cell membrane. Which structure is responsible for transporting molecules across the cell membrane?

• A

• B

• C

• D

The cell membrane is arranged with polar, hydrophilic heads to the outside, and non-polar, hydrophobic tails to the inside. With this arrangement, where would you MOST likely find water molecules?

• A only

• B only

• C only

• A and C

A microorganism releases water into its environment to regulate its salinity (saltiness). This process helps keep the microorganism in balance and is known as ________.

• Homeostasis

• Cell division

• Heredity

• Photosynthesis

• Mutation

Tags

NGSS.HS-LS1-3

Passive transport does NOT require ___________ to move molecules across the cell membrane.

• Solution

• Concentration

• Water

• Temperature

• Energy

A student filled a bag of dialysis tubing with a milky-white starch solution (like corn starch) and placed the bag in a beaker of iodine water. An hour later, the student observed that the starch solution in the bag had turned blue-black (positive test for starch). What is the most likely explanation for the change that occurred in the dialysis tubing?

• The iodine diffused into the bag

• The starch was changed to sugar

• The iodine was changed to starch

• The starch diffused out of the bag

Tags

NGSS.MS-PS1-2

Which of the following is NOT a characteristic of active transport?

• It moves substances against the concentration gradient

• It requires energy from the cell

• It involves facilitated diffusion

• It relies on a carrier protein

Suppose there is a beaker of water and a drop of blue dye is added. Eventually the water turned blue. The process responsible for the blue dye (not the water) becoming evenly distributed throughout the water is-

• Active transport

• Sodium-potassium pump

• Osmosis

• Diffusion

Suppose there is a beaker of water and a drop of blue dye is added. Eventually the water turned blue. Several hours later the water is still blue. You conclude that the-

• molecules have stopped diffusing

• molecules have stopped moving

• molecules continue to move

• blue color is made from starch