PSL 250 EXAM 1 MATERIAL QUESTIONS ANSWERED CORRECTLY
LATEST UPDATE 2026
What is physiology? - Answers The study of the functions and mechanisms in a
living system.
What is the scientific method? - Answers A systematic approach to research that
involves observation, hypothesis formulation, experimentation, and conclusion.
Why is science more than just facts? - Answers Science involves the process of
inquiry, critical thinking, and the development of theories based on evidence, rather
than merely collecting facts.
What are the six levels of organization in biology? - Answers The six levels are:
chemical, cellular, tissue, organ, organ system, and organism.
What is homeostasis? - Answers The maintenance of a stable internal environment
despite changes in external conditions.
What are the components of homeostasis? - Answers Receptor, control center, and
effector.
What is negative feedback? - Answers A control mechanism that reduces the output
or activity of a system to return to a set point.
What is positive feedback? - Answers A control mechanism that increases the output
or activity of a system, moving it away from a set point.
What are acids? - Answers Substances that donate protons (H+) in a solution,
lowering the pH.
What are bases? - Answers Substances that accept protons (H+) or donate hydroxide
ions (OH-) in a solution, raising the pH.
What is pH? - Answers A measure of the acidity or alkalinity of a solution, on a scale
from 0 to 14.
What are buffers? - Answers Substances that help maintain a stable pH in a solution
by neutralizing acids and bases.
What are the four biological macromolecules? - Answers Carbohydrates, lipids,
proteins, and nucleic acids.
What are monomers? - Answers The basic building blocks of macromolecules.
What are polymers? - Answers Large molecules formed by the covalent bonding of
many monomers.
LATEST UPDATE 2026
What is physiology? - Answers The study of the functions and mechanisms in a
living system.
What is the scientific method? - Answers A systematic approach to research that
involves observation, hypothesis formulation, experimentation, and conclusion.
Why is science more than just facts? - Answers Science involves the process of
inquiry, critical thinking, and the development of theories based on evidence, rather
than merely collecting facts.
What are the six levels of organization in biology? - Answers The six levels are:
chemical, cellular, tissue, organ, organ system, and organism.
What is homeostasis? - Answers The maintenance of a stable internal environment
despite changes in external conditions.
What are the components of homeostasis? - Answers Receptor, control center, and
effector.
What is negative feedback? - Answers A control mechanism that reduces the output
or activity of a system to return to a set point.
What is positive feedback? - Answers A control mechanism that increases the output
or activity of a system, moving it away from a set point.
What are acids? - Answers Substances that donate protons (H+) in a solution,
lowering the pH.
What are bases? - Answers Substances that accept protons (H+) or donate hydroxide
ions (OH-) in a solution, raising the pH.
What is pH? - Answers A measure of the acidity or alkalinity of a solution, on a scale
from 0 to 14.
What are buffers? - Answers Substances that help maintain a stable pH in a solution
by neutralizing acids and bases.
What are the four biological macromolecules? - Answers Carbohydrates, lipids,
proteins, and nucleic acids.
What are monomers? - Answers The basic building blocks of macromolecules.
What are polymers? - Answers Large molecules formed by the covalent bonding of
many monomers.
