Chapter 4: Cells And Their Env. Active T.

Explain sodium potassium pumps. Include why they are important, four steps to their function and whether it is a form of active or passive transport and why.

Endocytosis is

• A.

  The movement by a vesicle into a cell

• B.

  Transportation for larger molecules such as proteins and polysaccrides

• C.

  Transportation for waste to leave the cell

____________ is used by nerve cells and other various glands to export modified proteins. (Export by vesicles)

The binding of signal molecules to receptor proteins cause changes in the cell including:

• A.

  Activation of enzymes in cell

• B.

  Triggering formation of second messanger

• C.

  A change of permeability of membrane

• D.

  All above

Hormones are exaples of

Name three functions of a second messenger.

Beta blockers

• A.

  Are given to patients witha rapid heart beat

• B.

  Interfere with binding of signal molecules

• C.

  Prevent the heart from getting message to speed up unnecessarily

Another name for the fighting cells of the immune system. (NOT reffering to a "coloured" cell)

Explain the difference between carrier proteins used in passive transport and those used in active transport.