BIO TEST 3 - LECTURE 3 STUDY GUIDE

Question 1

What is the definition of osmosis?

Answer 1

Involves water traveling through a cell membrane

Question 2

Water flow is facilitated by _____________________ (special channels for water) in the plasma membrane of most cells. Fill in the blank.

Answer 2

Aquaporins

AQUA = WATER

Question 3

The concentration of all solutes in a solution determines the osmotic concentration of the solution. Which statement accurately describes the definition of (a) hyperosmotic solutions, (b) hypoosmotic solutions, or (c) isosmotic solutions?

Answer 3

Hypoosmotic

• low concentration

Hyperosmotic

• high concentration

Isosmotic

• solutes are equal to environment

Question 4

What is the definition of hydrostatic pressure regarding osmosis?

Answer 4

Hydrostatic pressure
- cytoplasm pushing out against the cell membrane

Question 5

What is the definition of turgor pressure regarding osmosis?

Answer 5

Turgor pressure

• presses the plasma membrane firmly against the interior of the cell wall.
  Remember interior

Question 6

What is the definition of osmotic pressure regarding osmosis?

Answer 6

Osmotic pressure
pressure to stop the osmotic movement of water across a membrane.

Question 7

What occurs to animals cells when they are placed in either (a) hyperosmotic solutions, (b) hypoosmotic solutions, or (c) isosmotic solutions?

Answer 7

HYPEROSMOTIC
PLASMOLYZED.
CELL LOSES WATER.
HYPOOSMOTIC
- LYSED.
-IT EXPLODES.
ISOMOTIC
ORMAL AND HEALTHY

Question 8

What occurs to plant cells when they are placed in either (a) hyperosmotic solutions, (b) hypoosmotic solutions, or (c) isomotic solutions?

Answer 8

(b) Hypoosmotic

TURGID

Question 9

There are many different ways organisms can maintain their osmotic balance. Which statement accurately describes the methods we discussed in class?

Answer 9

Internal Concentration

STAY ISOSMOTIC

Question 10

According to the video Osmosis, the movement of water molecules traveling across a cell membrane is ________________ transport, which means it does not require energy. Fill in the blanks.

Answer 10

Passive

Question 11

According to the video Osmosis, a low water concentration likely means there is a _____________ solute concentration. Water has the tendency to move to areas where there is a _____________ solute concentration, which would mean less water concentration. Fill in the blanks.

Answer 11

1. Greater

2. Higher

Question 12

According to the video Osmosis, if you want to easily figure out where the water will travel, what will you look for within the cell (or its environment)?

Answer 12

The side where there is a greater solute concentration