Science Practice Questions

List the number of protons, neutrons, and electrons for an anion with a charge of -3 if the neutral atom has an atomic number of 15 and a mass number of 31.

Experiments cannot validate hypotheses they can only falsify them. Which of the following statements best restates this idea?

Sulfur has an atomic number of 16 and an atomic mass of 32. In the sulfide ion (S²⁻), which of the following correctly lists the number of protons, neutrons, and electrons?

Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

Which of the following structures diverts food into the esophagus and prevents it from entering the lungs?

Which of the following classes of biological molecules includes enzymes?

The insulating sheath that facilitates rapid movement of the action potential down the axon is known as which of the following?

Scientists are conducting a study on whether sleep apnea is hereditary. When choosing applicants for the study, what is the most relevant piece of information the scientists should request from their subjects?

Which of the following enzyme classes is primarily responsible for adding deoxyribonucleotides to a pre-existing DNA strand?