Homeostasis, Cell Struct. & Function

Question 1

Define Homeostasis

Answer 1

Maintaining the balance of an organisms inside body.

Question 2

Examples of homeostasis

Answer 2

An example is the plasma membrane setting a boundary of what enters and leaves the cell.

Another example is balancing the inside of our body.

Question 3

(7.1) What are eukaryotic and prokaryotic cells?

Answer 3

Eukaryotic- Contains a nucleus and other organelles.
Prokaryotic- Does not contain a nucleus or other membrane-bound organelles.
One difference is prokaryotic cells are smaller and simpler than eukaryotic cells.

Question 4

What is selective permeability?

Answer 4

They will allow some substances to pass while keeping others out. This also controls how, when, and how much of each substances exit and enter the plasma membrane.

Question 5

What is the phospholipid bilayer?

Answer 5

Its two layers of phospholipids to allow the membrane to survive in water conditions. It has polar heads facing outside and nonpolar tails facing outside the cell.

Question 6

What is the role of cholesterol in the plasma membrane?

Answer 6

Cholesterol is non-polar; prevents the fatty acid tails of the phospholipid bilayer from sticking together.
Cholesterol contributes to the fluidity of the membrane.

Question 7

What are the roles of carbohydrates in the plasma membrane?

Answer 7

Carbohydrates define the cell’s characteristics.
Help cells identify chemical signals.
Carbohydrates attached to proteins are called glycoproteins.
Carbohydrates attached to lipids are called glycolipids.