BIO 1 EXAM 2025 QUESTIONS AND
ANSWERS
What elements make up 96% of living matter? - ANS carbon, hydrogen, oxygen, nitrogen
·What are trace elements, and what are some examples of trace elements? - ANS less 0.01
percent of body mass (needed by living body) EX iron carring o2 to the blood
· What information can things like the atomic mass, atomic number, and atomic mass number
tell about an atom? What determines each? - ANS
atomic mass - ANS Number of protons and neutrons (weighted average of different isotopes
atomic number - ANS the number of protons in the nucleus of an atom
atomic mass number (dalton) - ANS the total number of protons and neutrons in an atom's
nucleus
Increasing/decreasing reactant concentration - ANS pushes the reaction forward (toward
product formation) because the system seeks to consume the excess reactants / shifts the
reaction backward (toward reactant formation) as the system tries to replace the lost reactants.
·Increasing Product Concentration, Decreasing Product Concentration - ANS - The reaction
1
Page
shifts backward to reduce excess product and form more reactants.
@COPYRIGHT BRAINBARTER 2025/2026
, - The reaction shifts forward to produce more of the lost product.
polar covalent bond - ANS A covalent bond in which electrons are not shared equally
nonpolar covalent bond - ANS a covalent bond in which the electrons are shared equally by
the two atoms
ionic bond - ANS the complete transfer of valence electron(s) between atoms (full opernship)
valance electrons and what does it determine? - ANS the number of electrons in the
outermost energy level - chemical behavior, reactiveness
What is the importance of the weaker interactions in terms of biological function of molecules?
- ANS easily reversible. EX hydrogen bonds, van der Waals forces, and ionic interactions
molecular shape - ANS binding, recognition, and activity in biological systems.
reaction is at equilibrium - ANS Forward and reverse reactions occur at the same rate
What is the implication of the fact that chemical reactions are reversible - ANS may be
reversible but very hard
What are the four emergent properties of water that make it so vital to life? - ANS 1.
Cohesion/Adhesion of water,
2. High Specific Heat (Temperature Regulation)
3. Ice is Less Dense Than Liquid Water (Expansion Upon Freezing)
4. Water is the Universal Solvent
2
Page
@COPYRIGHT BRAINBARTER 2025/2026
ANSWERS
What elements make up 96% of living matter? - ANS carbon, hydrogen, oxygen, nitrogen
·What are trace elements, and what are some examples of trace elements? - ANS less 0.01
percent of body mass (needed by living body) EX iron carring o2 to the blood
· What information can things like the atomic mass, atomic number, and atomic mass number
tell about an atom? What determines each? - ANS
atomic mass - ANS Number of protons and neutrons (weighted average of different isotopes
atomic number - ANS the number of protons in the nucleus of an atom
atomic mass number (dalton) - ANS the total number of protons and neutrons in an atom's
nucleus
Increasing/decreasing reactant concentration - ANS pushes the reaction forward (toward
product formation) because the system seeks to consume the excess reactants / shifts the
reaction backward (toward reactant formation) as the system tries to replace the lost reactants.
·Increasing Product Concentration, Decreasing Product Concentration - ANS - The reaction
1
Page
shifts backward to reduce excess product and form more reactants.
@COPYRIGHT BRAINBARTER 2025/2026
, - The reaction shifts forward to produce more of the lost product.
polar covalent bond - ANS A covalent bond in which electrons are not shared equally
nonpolar covalent bond - ANS a covalent bond in which the electrons are shared equally by
the two atoms
ionic bond - ANS the complete transfer of valence electron(s) between atoms (full opernship)
valance electrons and what does it determine? - ANS the number of electrons in the
outermost energy level - chemical behavior, reactiveness
What is the importance of the weaker interactions in terms of biological function of molecules?
- ANS easily reversible. EX hydrogen bonds, van der Waals forces, and ionic interactions
molecular shape - ANS binding, recognition, and activity in biological systems.
reaction is at equilibrium - ANS Forward and reverse reactions occur at the same rate
What is the implication of the fact that chemical reactions are reversible - ANS may be
reversible but very hard
What are the four emergent properties of water that make it so vital to life? - ANS 1.
Cohesion/Adhesion of water,
2. High Specific Heat (Temperature Regulation)
3. Ice is Less Dense Than Liquid Water (Expansion Upon Freezing)
4. Water is the Universal Solvent
2
Page
@COPYRIGHT BRAINBARTER 2025/2026
