Bio 11.1: Exercise 4 (2nd Exam)

Hypothesis

• Educated guess

• Tentative explanation to a Question/Problem.

• Can be confirmed, rejected, or revised.

-Written in Clear, Concise, and Formal Language.
-Predicts a tentative relationship between an IV (Manipulated) and DV (Measured).
-Makes a prediction and speculated an outcome.
-Predictable/Falsifiable
-Leads to another hypothesis

Characteristics of a Good Hypothesis: (W P M P L)

Tonicity
Water content

• Ability of a solution to modify the volume of cells by affecting _.

• H_

• I_

• H_

Osmolarity (Osmotic concentration)
Solvent
Membrane
Particles
Solvent

• Concentration of particles in a volume of _.

• Used when there is a _ involved that separates the _ and the _.

Osmosis

• Movement of solvent (water) across a membrane to an area with higher osmolarity.

• Low to High concentration.

Hypertonic / Hyperosmotic
Isotonic / Isosmotic
Hypotonic / Hypoosmotic

Tonicity Levels: (H I H)

Hypertonic / Hyperosmotic
Higher
Decreases
Shriveled
Plasmolyzed

• E > C

• Osmotic concentration of Environment is _ than the Cell.

• Water will move out from the cell.

• Volume of the cell _.

• Outcome:

  • Animal cells: S_

  • Plant cells: P_

• Inside to outside.

Isotonic / Isosmotic
Equal
0
Normal
Flaccid

• E = C

• Osmotic concentration of Environment is _ to the Cell.

• Net movement of water is _.

• Outcome:

  • Animal cells: N_

  • Plant cells: F_

• No movement.

Hypotonic / Hypoosmotic
Less than
Increases
Lysed
Turgid

• E < C

• Osmotic concentration of the Environment is _ the Cell.

• Water will move into the cell.

• Volume of the cell _.

• Outcome:

  • Animal cells: L_ (or will burst)

  • Plant cells: T_ (normal)

• Outside to inside.

Why is there an Osmosis?

• To maintain the equilibrium of our cells and the environment.