TEAS Science Practice Test #2 3

Question 1

Which blood type is known as the "universal donor" for red blood cell transfusions?

Accepted Answer

O−

Answer

Type O− (O negative) blood is called the universal donor for red blood cells because it lacks A, B, and Rh antigens, so it can be safely transfused to patients of any blood type in emergencies.

Question 2

What is the role of insulin in the body?

Accepted Answer

To facilitate glucose uptake by cells, lowering blood sugar

Answer

Insulin, produced by beta cells in the pancreas, allows cells throughout the body to absorb glucose from the bloodstream for energy or storage, thereby lowering blood glucose levels. Its absence or resistance causes diabetes.

Question 3

Which of the following is an example of a physical change?

Accepted Answer

Ice melting

Answer

A physical change alters the form or appearance of a substance without changing its chemical composition. Ice melting into water is a phase change — it is still H₂O. Rusting, burning, and baking involve chemical reactions that form new substances.

Question 4

Which structure in a cell contains the genetic information (DNA)?

Accepted Answer

Nucleus

Answer

The nucleus is the control center of the cell and contains most of the cell's DNA in the form of chromosomes. (Mitochondria contain a small amount of their own DNA, but the primary genetic repository is the nucleus.)

Question 5

What is the function of the alveoli in the lungs?

Accepted Answer

Allow gas exchange between air and blood

Answer

Alveoli are tiny air sacs at the end of the bronchioles where gas exchange occurs. Oxygen from inhaled air crosses the thin alveolar walls into surrounding capillaries, while carbon dioxide moves from blood into the alveoli to be exhaled.

TEAS Practice Test

TEAS Practice Test

TEAS Science Practice Test #2 3