Transport across plasma membrane

plasma membrane is selectively permeable to certain substances. which of the following substances is/are NOT permeable to the cell surface membrane?

i. ions

ii. hydrophobic molecules

iii. tiny and polar molecules

iv. tiny and large molecules

• iv only

• i and ii

• iii and iv

• i,ii and iii

When Red Blood cells is put in a hypotonic solution, it will _______________.

• Shrink

• Not change size of the cell

• swell and perhaps burst (lyse)

• cause size of the cell will change from large to small and from small to large

If two solutions have the same solute concentration and the same water concentration, they are said to be ___________ to each other.

• Hypotonic

• Isotonic

• Hypertonic

• Proteotonic

A cell takes in dissolved materials by forming tiny vesicles around fluid droplets trapped by folds of the plasma membrane. This process is ________.

 

• active transport

• receptor mediated endocytosis

• pinocytosis

• facilitated diffusion

The sodium-potassium pump, an example of active transport, usually pumps

• both sodium and potassium ions into the cell.

• sodium ions out of the cell and potassium ions in.

• both sodium and potassium ions out of the cell.

• sodium ions into the cell and potassium ions out.

"That only certain things may enter or exit the cell, whereas others are not permitted to cross the cell membrane" is the best definition for what word?

 

• Selective transport

• Cell Membrane

• Selectively permeable

• Active Transport

Where are peripheral proteins attached?

 

• The surface of the cell membrane

• The rough endoplasmic reticulum

• The Golgi apparatus

• The interior of the cell membrane

which of the following does not involved facilitated diffusion?

 

• movement of sodium ion across the membrane of axon during action potential

• transportation of glucose into the cell

• diffusion of ATP from the mitochondria

• movement of oxygen and carbon dioxide across the membrane of the alveolus

When, potassium bind to the site of protein membrane, phosphate will be detached from the protein and return to normal shape. This is called as ___________.

• Phosphorylation

• hydrolysis

• dephosphorylation

• active transport

Which of the following BEST describe the picture shown above ?

• phagocytosis

• pinocytosis

• exocytosis

• receptor mediated endocytosis