BIOD 101 MODULE 1 COMPREHENSIVE
EXAM QUESTIONS & VERIFIED
ANSWERS (A+ GUARANTEE)
1. In the scientific method, which of the following best describes a ‘theory’?
A. A preliminary guess that has not yet been tested.
B. A specific prediction about the outcome of a single experiment.
C. A mathematical formula that describes natural phenomena without explanation.
D. A broad explanation supported by a large body of evidence and repeated testing.
Answer: D
Conceptual Explanation: A scientific theory is a comprehensive explanation of some
aspect of the natural world that is acquired through the scientific method and repeatedly
tested and confirmed.
2. Which subatomic particle is primarily responsible for determining the chemical reactivity of
an atom?
A. Neutrons in the nucleus
B. Electrons in the outermost shell
C. Protons in the nucleus
D. Positrons orbiting the nucleus
,Answer: B
Conceptual Explanation: Valence electrons, located in the outermost shell, determine how
an atom interacts and bonds with other atoms.
3. Carbon-14 is an isotope of Carbon-12. What specifically differs between these two atoms?
A. The number of neutrons
B. The number of protons
C. The number of electrons
D. The atomic number
Answer: A
Conceptual Explanation: Isotopes are atoms of the same element that have the same
number of protons but different numbers of neutrons, resulting in different mass numbers.
4. Which type of bond involves the unequal sharing of electrons between atoms with
different electronegativities?
A. Nonpolar covalent bond
B. Polar covalent bond
C. Hydrogen bond
D. Ionic bond
Answer: B
, Conceptual Explanation: Polar covalent bonds occur when electrons are shared unequally
because one atom has a stronger pull (electronegativity) than the other.
5. Water’s ability to move against gravity in a plant’s xylem is primarily due to which
property?
A. High specific heat
B. Cohesion and adhesion
C. Low density as a solid
D. High heat of vaporization
Answer: B
Conceptual Explanation: Cohesion (water sticking to water) and adhesion (water sticking
to other surfaces) work together to create capillary action.
6. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 1000 times
B. 30 times
C. 100 times
D. 3 times
Answer: A
EXAM QUESTIONS & VERIFIED
ANSWERS (A+ GUARANTEE)
1. In the scientific method, which of the following best describes a ‘theory’?
A. A preliminary guess that has not yet been tested.
B. A specific prediction about the outcome of a single experiment.
C. A mathematical formula that describes natural phenomena without explanation.
D. A broad explanation supported by a large body of evidence and repeated testing.
Answer: D
Conceptual Explanation: A scientific theory is a comprehensive explanation of some
aspect of the natural world that is acquired through the scientific method and repeatedly
tested and confirmed.
2. Which subatomic particle is primarily responsible for determining the chemical reactivity of
an atom?
A. Neutrons in the nucleus
B. Electrons in the outermost shell
C. Protons in the nucleus
D. Positrons orbiting the nucleus
,Answer: B
Conceptual Explanation: Valence electrons, located in the outermost shell, determine how
an atom interacts and bonds with other atoms.
3. Carbon-14 is an isotope of Carbon-12. What specifically differs between these two atoms?
A. The number of neutrons
B. The number of protons
C. The number of electrons
D. The atomic number
Answer: A
Conceptual Explanation: Isotopes are atoms of the same element that have the same
number of protons but different numbers of neutrons, resulting in different mass numbers.
4. Which type of bond involves the unequal sharing of electrons between atoms with
different electronegativities?
A. Nonpolar covalent bond
B. Polar covalent bond
C. Hydrogen bond
D. Ionic bond
Answer: B
, Conceptual Explanation: Polar covalent bonds occur when electrons are shared unequally
because one atom has a stronger pull (electronegativity) than the other.
5. Water’s ability to move against gravity in a plant’s xylem is primarily due to which
property?
A. High specific heat
B. Cohesion and adhesion
C. Low density as a solid
D. High heat of vaporization
Answer: B
Conceptual Explanation: Cohesion (water sticking to water) and adhesion (water sticking
to other surfaces) work together to create capillary action.
6. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 1000 times
B. 30 times
C. 100 times
D. 3 times
Answer: A
