PENN FOSTER INTRO TO BIOLOGY
PROCTORED FULL SOLUTION 2026
QUESTIONS WITH SOLUTIONS GRADED A+
⩥ A modification that makes organisms more suited to their environment
is called a/an: Answer: Adaptation
⩥ During a scientific experiment, the control group is: Answer: Identical
to the experimental group in all areas except the variable being tested
⩥ When an atom has 2 or more electron shells, the outer shell will be
most stable if it contains 8 electrons. This concept is called the: Answer:
Octet rule
⩥ When 2 oxygen atoms join together, a __ is formed. Answer:
Molecule
⩥ The __ bond is a type of atomic bonds in which atoms share electrons
to produce a completed outer shell. Answer: Covalent
⩥ The polarity of water molecules causes them to be attracted to one
another by a __ bond. Answer: Hydrogen
, ⩥ As the number of hydrogen ions in a solution increases, the pH of the
solution: Answer: Decreases
⩥ During winter only the upper surface of a lake freezes, which allows
for life to persist below the surface. Which of water's unique properties
is responsible for this phenomenon? Answer: Lower density as ice
⩥ The most abundant element by weight in the human body is Answer:
Oxygen
⩥ The polysaccharide structural carbohydrate most commonly used by
living things is: Answer: Cellulose
⩥ Which one of the following functional groups is associated with fatty
acids? Answer: Carboxyl
⩥ The hard body parts of insects and crabs are composed of a
polysaccharide called: Answer: Chitin
⩥ Cell membranes are composed mainly of which type of lipids?
Answer: Phospholipids
⩥ ___ proteins are made of polypeptide chains folded into rounded
compact shapes. Answer: Globular
PROCTORED FULL SOLUTION 2026
QUESTIONS WITH SOLUTIONS GRADED A+
⩥ A modification that makes organisms more suited to their environment
is called a/an: Answer: Adaptation
⩥ During a scientific experiment, the control group is: Answer: Identical
to the experimental group in all areas except the variable being tested
⩥ When an atom has 2 or more electron shells, the outer shell will be
most stable if it contains 8 electrons. This concept is called the: Answer:
Octet rule
⩥ When 2 oxygen atoms join together, a __ is formed. Answer:
Molecule
⩥ The __ bond is a type of atomic bonds in which atoms share electrons
to produce a completed outer shell. Answer: Covalent
⩥ The polarity of water molecules causes them to be attracted to one
another by a __ bond. Answer: Hydrogen
, ⩥ As the number of hydrogen ions in a solution increases, the pH of the
solution: Answer: Decreases
⩥ During winter only the upper surface of a lake freezes, which allows
for life to persist below the surface. Which of water's unique properties
is responsible for this phenomenon? Answer: Lower density as ice
⩥ The most abundant element by weight in the human body is Answer:
Oxygen
⩥ The polysaccharide structural carbohydrate most commonly used by
living things is: Answer: Cellulose
⩥ Which one of the following functional groups is associated with fatty
acids? Answer: Carboxyl
⩥ The hard body parts of insects and crabs are composed of a
polysaccharide called: Answer: Chitin
⩥ Cell membranes are composed mainly of which type of lipids?
Answer: Phospholipids
⩥ ___ proteins are made of polypeptide chains folded into rounded
compact shapes. Answer: Globular
