Question

1. an amoeba expels waste.

a. does this require energy?
b. is this active or passive transport?
c. is this endocytosis or exocytosis?

1. red bloods cells placed in beaker of water

a. will water move from the red blood cells to the beaker of water, or from the beaker of water to the red blood cells?
b. which has the higher concentration of water, the beaker of water or the red blood cells?
c. does this require energy?
d. is this diffusion or osmosis?

Explanation:

Step1: Analyze amoeba waste - expelling

Amoeba expelling waste is an active process. It requires energy - expenditure by the cell to transport waste out.

Step2: Determine transport type

Since it requires energy, it is active transport. And expelling waste out of the cell is exocytosis.

Step3: Analyze red - blood - cell and water

Water moves from an area of high water concentration to an area of low water concentration. A beaker of pure water has a higher water concentration than red - blood cells. So water moves from the beaker to the red - blood cells. This is a passive process (osmosis) and does not require energy. Osmosis is the diffusion of water across a semi - permeable membrane.

Answer:

19.
a. Yes
b. Active transport
c. Exocytosis
20.
a. From the beaker of water to the red blood cells
b. The beaker of water
c. No
d. Osmosis