100 POINTS!!
An organism's ability to maintain balance and stability within its vital internal systems is best referred to as what
process?

Question 6 options:

mitosis


homeostasis


photosynthesis


asexual reproduction
Which helps a paramecium maintain homeostasis in aquatic environments.

Question 7 options:

contractile vacuole


macronucleus


mitochondria


eyespot

Question 8 (4 points)
When placed into a solution that is 30% water and 70% salt, what would happen to a cell that has a 70% water concentration?

Question 8 options:

The cell will maintain its 70% water concentration and remain the same size.


The cell will lose water and shrink to reach equilibrium with the environment.


The cell will take in water and swell to reach equilibrium with the environment.


The cell will maintain its 70% water concentration and swell to allow for some salt to enter the cell to reach
equilibrium with the environment.

Question 9 (4 points)
Which uses energy to maintain cellular homeostasis?

Question 9 options:

passive transport of ions into a cell


movement of a solute from low to high concentration


movement of a solute from high to low concentration


water flowing into a cell until it reaches the same concentration as water surrounding the cell

Question 10 (4 points)
Root cells must pump ions inward so they maintain homeostasis. This is considered what type of transport?

Question 10 options:

passive


diffusion


osmosis


active

Question 11 (4 points)
A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm.
What is the best explanation for his observation?

Question 11 options:

water moved into the lettuce cells by active transport


water moved out of the lettuce by osmosis


water moved into the lettuce by osmosis


salt moved into the lettuce by diffusion

Question 12 (4 points)
An animal cell with a concentration of 7% dissolved sugars, salts, and other substances is placed in a cup containing a
15% sugar solution.



What would a student most likely observe after 30 minutes?

Question 12 options:

Water molecules will move into the cell causing it to swell.


Water molecules will move out of the cell causing it to shrivel.


The dissolved substances will move out of the cell causing it to shrivel.


The dissolved sugars in the cup will move into the cell causing it to burst.

Question 13 (4 points)
Which factor affects osmosis through a membrane?

Question 13 options:

how fast the carrier proteins move substances through the plasma membrane


how slow the carrier proteins move substances through the plasma membrane


concentration of water on one side of the membrane and the permeability of the membrane


concentration of water on both sides of the membrane and the permeability of the membrane

Question 14 (4 points)
Each beaker shown below contains an amphibian egg collected from one of four different locations.



Which of these beakers contains an egg that would shrink?

Question 14 options:

1


2


3


4

Question 15 (4 points)
A cell with a 10% salt concentration is placed into a beaker that contains a 20% salt concentration. The cell shrinks,
as shown in the diagram below.



which part of the cell controls the movement of substances?

Question 15 options:

mitochondria


cell membrane


chloroplast


nucleus

Question 16 (4 points)
Which component of the cell membrane functions to actively transport molecules into the cell?

Question 16 options:

carbohydrate


cytoplasm


phospholipid


protein

Question 17 (4 points)
What part of the phospholipid is most likely to reject water molecules?

Question 17 options:

hydrophobic lipid tails


proteins


hydrophilic phospho-head


carbohydrate chain

Question 18 (4 points)
A student is given a beaker full of water and a pipette with food coloring. The student dropped the food coloring into the water beaker. The student observed the food coloring beginning to disperse into the water. What process was most likely happening?

Question 18 options:

diffusion


osmosis


active transport


replication

Question 19 (3 points)
In which ways are prokaryotes and eukaryotes similar?

Question 19 options:

They both contain DNA


They both contain a nucleus


They both are highly complex


They both have membrane bound organelles

Question 20 (3 points)
Which function would an algal cell not be able to perform if its chloroplasts removed?

Question 20 options:

cellular respiration


protein synthesis


storage and transport


photosynthesis