BIOLOGY 101 INTRODUCTORY REVIEW
2026 QUESTIONS WITH SOLUTIONS
TESTED QUESTIONS.
⚫ Which of the following statements describes a controlled
experiment? Answer: an experiment with at least two groups, one of
which does not receive the experimental treatment
⚫ Which of the following is the best description of a control for an
experiment? Answer: The control group is matched with the
experimental group except for the one experimental variable.
⚫ Why is it important that an experiment include a control group?
Answer: A control group provides a reference by which to determine
if a particular outcome may reasonably result from the variable being
tested.
⚫ All the organisms on your campus make up. Answer: a
community
⚫ Which of the following is the key characteristic that is ultimately
responsible for the unique chemical properties of each element?
Answer: Each element has a unique number of protons
⚫ One difference between carbon-12 ( C) and carbon-14 ( C) is that
carbon-14 has. Answer: two more neutrons than carbon-12.
, ⚫ An atom has 6 electrons in its outer shell. How many unpaired
electrons does it have? Answer: 2
⚫ Which of the following best describes how an atom with atomic
number 12 would behave in terms of forming bonds with other
elements? Answer: It would form ions with a +2 charge.
⚫ The atomic number of chlorine is 17. The atomic number of
calcium is 20. What is the chemical formula for calcium chloride?
Answer: CaCl2
⚫ In a single molecule of water, two hydrogen atoms are bonded to
a single oxygen atom by. Answer: polar covalent bonds.
⚫ Which of the following effects is produced by the high surface
tension of water? Answer: A water strider can walk across the
surface of a small pond.
⚫ What is the pH of a solution with a hydroxyl ion (OH-)
concentration of 10-12 M? Answer: pH 2
⚫ Which of the following solutions would require addition of the
greatest amount of base to bring the solution to neutral pH? Answer:
gastric juice at pH 2
2026 QUESTIONS WITH SOLUTIONS
TESTED QUESTIONS.
⚫ Which of the following statements describes a controlled
experiment? Answer: an experiment with at least two groups, one of
which does not receive the experimental treatment
⚫ Which of the following is the best description of a control for an
experiment? Answer: The control group is matched with the
experimental group except for the one experimental variable.
⚫ Why is it important that an experiment include a control group?
Answer: A control group provides a reference by which to determine
if a particular outcome may reasonably result from the variable being
tested.
⚫ All the organisms on your campus make up. Answer: a
community
⚫ Which of the following is the key characteristic that is ultimately
responsible for the unique chemical properties of each element?
Answer: Each element has a unique number of protons
⚫ One difference between carbon-12 ( C) and carbon-14 ( C) is that
carbon-14 has. Answer: two more neutrons than carbon-12.
, ⚫ An atom has 6 electrons in its outer shell. How many unpaired
electrons does it have? Answer: 2
⚫ Which of the following best describes how an atom with atomic
number 12 would behave in terms of forming bonds with other
elements? Answer: It would form ions with a +2 charge.
⚫ The atomic number of chlorine is 17. The atomic number of
calcium is 20. What is the chemical formula for calcium chloride?
Answer: CaCl2
⚫ In a single molecule of water, two hydrogen atoms are bonded to
a single oxygen atom by. Answer: polar covalent bonds.
⚫ Which of the following effects is produced by the high surface
tension of water? Answer: A water strider can walk across the
surface of a small pond.
⚫ What is the pH of a solution with a hydroxyl ion (OH-)
concentration of 10-12 M? Answer: pH 2
⚫ Which of the following solutions would require addition of the
greatest amount of base to bring the solution to neutral pH? Answer:
gastric juice at pH 2
