TEAS Science Practice Test #2 3 — Questions and Answers
Question 1: Which blood type is known as the "universal donor" for red blood cell transfusions?
- AB+
- O− (Correct answer)
- A+
- B−
Correct answer: O−
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?
- To break down proteins in the digestive system
- To stimulate the liver to produce more glucose
- To facilitate glucose uptake by cells, lowering blood sugar (Correct answer)
- To increase heart rate during stress
Correct answer: To facilitate glucose uptake by cells, lowering blood sugar
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?
- Iron rusting
- Wood burning
- Ice melting (Correct answer)
- Bread baking
Correct answer: Ice melting
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)?
- Mitochondria
- Ribosome
- Nucleus (Correct answer)
- Cell membrane
Correct answer: Nucleus
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?
- Filter dust particles from inhaled air
- Allow gas exchange between air and blood (Correct answer)
- Produce mucus to trap pathogens
- Regulate the rate of breathing
Correct answer: Allow gas exchange between air and blood
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.
Question 6: Which of the following represents Newton's Second Law of Motion?
- An object at rest stays at rest unless acted upon by a force
- F = ma (Force equals mass times acceleration) (Correct answer)
- For every action there is an equal and opposite reaction
- Energy is neither created nor destroyed
Correct answer: F = ma (Force equals mass times acceleration)
Newton's Second Law states that the net force acting on an object equals its mass multiplied by its acceleration (F = ma). This explains why heavier objects require more force to accelerate at the same rate as lighter ones.
TEAS Science Practice Test #2 3
Which blood type is known as the "universal donor" for red blood cell transfusions?