Plasma Membrane

Plasma membrane .....

• is selectively permeable

• consist of triglyceride and cholesterol

• separate cytoplasm and extracellular fluid

• have proteins embedded the phospholipid bilayer

Figure shows three different plant cells immersed in solution with different concentration. Choose a normal healthy plant cell in the figure.

• Cell A

• Cell B

• Cell C

Identify suitable stimulus to open ion gated channel in the figure.

• Voltage

• Mechanical

• Chemical

• Enzyme

How molecule in the figure can be transported across plasma membrane? (can be more than one answer)

• Down concentration gradient

• Using channel protein

• Using carrier protein

• Diffuse through phospholipid bilayer

How sucrose is transported into a plant cell?

• Uses H+ gradient generated by proton ATP-powered proton pump.

• Down its concentration gradient into the cell.

• In the company of H+ that travels against its electrochemical gradient.

• Uses sucrose transporter channel protein.

Statements below are true about receptor medited endocytosis EXCEPT .

• It is a specialized type of pinocytosis.

• It is a type of passive transport

• Substance can be acquired even in low quantities in extracellular fluid

• It enables cells to acquire bulk quantities of specific substance.

A major function of glycoproteins and glycolipids in the membane is to

• glue cells together to form tissues

• allow cells to identify each other

• attach membrane to cytoskeleton

• help retain shape

Which statements are true about active transport?

• molecules move from low concentration to high concentration.

• molecules move from high concentration to low concentration.

• ATP is required

• Uses channel proteins

Some celery sticks were placed in distilled water. What type of solution are they in? What will happen to the celery sticks?

• hypotonic, the celery sticks increase in size

• hypertonic, the celery sticks reduce in size

• isotonic, the celery sticks remains in size

The animal cell on the left is in a(n) __________________ environment

• Hypertonic

• Hypotonic

• Isotonic