BIOL 181 WEEK 1–8 FULL COURSE REVIEW &
PRACTICE QUESTIONS 2026
◉ Molecules. Answer: Two or more atoms bonded together.
◉ Cell. Answer: Smallest unit of life.
◉ Tissue. Answer: Specialized cells working together for one
function.
◉ Organ. Answer: Tissues working together.
◉ Organ system. Answer: Set of organs working together.
◉ Organism. Answer: Individual consisting of one or more cells.
◉ Population. Answer: Individuals of the same species in the same
area.
◉ Community. Answer: Populations of all species in the same area.
◉ Ecosystem. Answer: A community and its environment.
, ◉ Biosphere. Answer: All regions of the Earth where organisms live.
◉ Order. Answer: Organisms being highly organized and
coordinated. A way in which one or more cells (structures)
coordinate.
◉ How do organisms sense and respond to change?. Answer: The
internal environment kept within certain ranges of composition,
temperature, and other conditions.
◉ Homeostasis. Answer: Organisms keep conditions in the internal
environment within a range that favors cell survival. (Can also be
considered balance.)
◉ Negative feedback. Answer: Feedback in homeostasis that is a
loop system and is correlated to regulating body temperature and
glucose levels.
◉ Positive feedback. Answer: Feedback in homeostasis that is not a
loop system and is correlated to going into labor and blood clotting.
◉ Energy. Answer: The capacity to do work. Not cycled; it flows in
one direction.
PRACTICE QUESTIONS 2026
◉ Molecules. Answer: Two or more atoms bonded together.
◉ Cell. Answer: Smallest unit of life.
◉ Tissue. Answer: Specialized cells working together for one
function.
◉ Organ. Answer: Tissues working together.
◉ Organ system. Answer: Set of organs working together.
◉ Organism. Answer: Individual consisting of one or more cells.
◉ Population. Answer: Individuals of the same species in the same
area.
◉ Community. Answer: Populations of all species in the same area.
◉ Ecosystem. Answer: A community and its environment.
, ◉ Biosphere. Answer: All regions of the Earth where organisms live.
◉ Order. Answer: Organisms being highly organized and
coordinated. A way in which one or more cells (structures)
coordinate.
◉ How do organisms sense and respond to change?. Answer: The
internal environment kept within certain ranges of composition,
temperature, and other conditions.
◉ Homeostasis. Answer: Organisms keep conditions in the internal
environment within a range that favors cell survival. (Can also be
considered balance.)
◉ Negative feedback. Answer: Feedback in homeostasis that is a
loop system and is correlated to regulating body temperature and
glucose levels.
◉ Positive feedback. Answer: Feedback in homeostasis that is not a
loop system and is correlated to going into labor and blood clotting.
◉ Energy. Answer: The capacity to do work. Not cycled; it flows in
one direction.
