Study Guide Cell Homeostasis SB1d
1. Describe what would happen if the cell is placed in each solution in each beaker
A
B
C
A. If a cell is placed in a hypotonic
solution, the cell will swell because
water enters the cell by osmosis.
B. If a cell is placed in a hypertonic
solution, the cell will shrink because
water leaves the cell by osmosis.
C. If a cell is placed in an isotonic solution,
the cell will have equal amounts of
water entering and leaving the cell.
2. Plasmolysis occurs when plant cells lose water and the cell membrane caves in. Explain how plasmolysis occurs.
The plant cell was placed in a hypertonic solution; the cell will shrink because water leaves the cell by osmosis.
3. If a sugar cube is placed in a beaker of water, what will happen over time?
The sugar will diffuse from an area of high sugar to low sugar concentration over time and be evenly distributed
eventually.
4. Explain the difference in active and passive transport.
Active transport requires energy to move materials from low to high concentration while passive transport does not
require energy to move materials from high to low concentration.
5. Explain the difference in the two forms of active transport that we have discussed.
Endocytosis allows cells to bring materials into the cell and exocytosis allows cells to release materials from cells.
6. Be able to do osmosis problems like these below.
7. Describe the cell membrane
a.
b.
the cell’s boundary from its environment
regulates which materials enter and leave the cell
c. it is made of phospholipids and supported by cholesterol in the non-polar (hydrophobic) section s of those phospholipids
8. Exocytosis expels or releases materials such as hormones from cells to maintain homeostasis.
9. An example of passive transport is facilitated diffusion because it moves materials from high to low concentration. The
diffusion of water across a membrane is called osmosis.
10.
a.
b.
c.
Diffusion is a process that involves the following:
an area of high concentration to an area of low concentration.
occurs because kinetic energy causes molecules to constantly move and collide with each other.
if it occurs and the solutions on both sides of the membrane become equal (the same) then the molecules will continue to
move across the membrane in both directions equally.