TEAS Science Practice Test #2 2 — Questions and Answers
Question 1: What is the primary function of red blood cells (erythrocytes)?
- Fight infection
- Transport oxygen and carbon dioxide (Correct answer)
- Initiate blood clotting
- Produce antibodies
Correct answer: Transport oxygen and carbon dioxide
Red blood cells contain hemoglobin, which binds to oxygen in the lungs and transports it to tissues throughout the body. They also carry carbon dioxide back to the lungs for exhalation.
Question 2: Which part of the neuron transmits electrical impulses away from the cell body?
- Dendrite
- Myelin sheath
- Axon (Correct answer)
- Nucleus
Correct answer: Axon
The axon is the long projection of a neuron that carries electrical impulses (action potentials) away from the cell body toward other neurons, muscles, or glands. Dendrites receive signals toward the cell body.
Question 3: In chemistry, what is a "solution"?
- A pure substance with fixed composition
- A heterogeneous mixture with visible particles
- A homogeneous mixture in which a solute is dissolved in a solvent (Correct answer)
- A compound formed during a chemical reaction
Correct answer: A homogeneous mixture in which a solute is dissolved in a solvent
A solution is a homogeneous mixture where a solute (the dissolved substance) is uniformly distributed in a solvent (the dissolving medium). Saline solution (salt dissolved in water) is a common medical example.
Question 4: Which organ system is primarily responsible for regulating body temperature, water balance, and waste elimination through sweat?
- Urinary system
- Integumentary system (Correct answer)
- Lymphatic system
- Endocrine system
Correct answer: Integumentary system
The integumentary system (skin, hair, nails, sweat glands, and sebaceous glands) regulates body temperature through sweat production and evaporation, and eliminates small amounts of waste through perspiration.
Question 5: What happens during the process of cellular respiration?
- Cells absorb sunlight to produce glucose
- Glucose is broken down to produce ATP (energy) (Correct answer)
- Oxygen is converted into carbon dioxide
- Proteins are synthesized from amino acids
Correct answer: Glucose is broken down to produce ATP (energy)
Cellular respiration is the process by which cells break down glucose (and other fuel molecules) in the presence of oxygen to produce ATP (adenosine triphosphate), the primary energy currency of the cell. CO₂ and water are byproducts.
Question 6: Which of the following correctly describes a "covalent bond"?
- The transfer of electrons between a metal and a non-metal
- The attraction between oppositely charged ions
- The sharing of electron pairs between non-metal atoms (Correct answer)
- The weak attraction between water molecules
Correct answer: The sharing of electron pairs between non-metal atoms
A covalent bond forms when two non-metal atoms share pairs of electrons. This is different from an ionic bond, where electrons are transferred, creating oppositely charged ions that attract each other.
TEAS Science Practice Test #2 2
What is the primary function of red blood cells (erythrocytes)?