TEAS Science Practice Test #5 2

Question 1

What is the role of the cerebellum in the brain?

Accepted Answer

To coordinate voluntary movement, balance, and posture

Answer

The cerebellum (Latin for "little brain") is located at the back of the brain and is responsible for coordinating voluntary movements, maintaining balance and posture, and fine-tuning motor activity for smooth, precise movement.

Question 2

Which of the following correctly describes an "exothermic" chemical reaction?

Accepted Answer

A reaction that releases energy (heat) to the surroundings

Answer

An exothermic reaction releases energy (usually as heat) to the surroundings, so the products have less energy than the reactants. Combustion (burning) and many oxidation reactions are exothermic. Endothermic reactions absorb energy.

Question 3

Which blood vessels carry oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary veins

Answer

Pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart — the only veins in the body that carry oxygenated blood. Pulmonary arteries carry deoxygenated blood from the right ventricle to the lungs.

Question 4

What is the term for an organism that can cause disease in a host?

Accepted Answer

Pathogen

Answer

A pathogen is any microorganism (bacterium, virus, fungus, parasite) capable of causing disease in a susceptible host. Pathogens overcome host defenses and damage tissues, triggering symptoms of infection.

Question 5

Which property of water makes it an effective solvent for biological molecules?

Accepted Answer

Its polar nature and ability to form hydrogen bonds

Answer

Water is a polar molecule with a slight negative charge on the oxygen and slight positive charges on the hydrogens. This allows it to form hydrogen bonds with and dissolve other polar and ionic molecules, making it the "universal solvent" for biological processes.

TEAS Practice Test

TEAS Practice Test

TEAS Science Practice Test #5 2