UNCW BIO 201 EXAM 1 FINAL PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
◉ Hydrogen Bonds. Answer: forms when a hydrogen atom
covalently bonded to one electronegative atom is also attracted to
another electronegative atom
- in living cells the electronegative partner is usually oxygen or
nitrogen
◉ Weak Chemical Bonds. Answer: reinforce the shape of large
molecules and helps molecules adhere to each other
◉ Water. Answer: biological medium on earth
◉ Polar Molecules. Answer: the opposite ends have opposite charges
- allows water molecules to form hydrogen bonds with each other
- oxygen has a partial negative change and hydrogen has a partial
positive change
- hydrogen bonds are constantly forming and reforming
◉ Properties of Water. Answer: cohesive behavior, moderation of
temperature, expansion upon freezing, the solvent of life
,◉ Cohesion. Answer: collective, hydrogen bonds hold water
molecules together
- helps the transport of water against gravity in plants
◉ Adhesion. Answer: an attraction between different substances
-ex. water and plant cells
◉ Specific Heat. Answer: measure of how well a substance resists
changing its temperature when it absorbs or releases heat
- water's high specific heat can be traced to hydrogen bonding
◉ Evaporative Cooling. Answer: as liquid evaporates, its remaining
surface cools
- evaporative cooling of water helps stabilize temperatures in
organisms (sweating) and bodies of water
◉ Evaporation. Answer: transformation of a substance from liquid to
gas
◉ Expansion Upon Freezing. Answer: ice floats in liquid water
because hydrogen bonds in ice are more ordered, making ice less
dense
, ◉ Solution. Answer: a liquid that is a homogenous mixture of
substances
◉ Solvent. Answer: the dissolving agent of a solution
◉ Solute. Answer: the substance that is dissolved
◉ Aqueous Solution. Answer: one in which water is the solvent
- water is a versatile solvent due to its polarity
◉ Hydrophilic. Answer: one that has an affinity for water (polar)
◉ Hydrophobic. Answer: one that does not have an affinity for water
(non polar)
◉ Acid. Answer: any substance that increases the H+ concentration
of a solution
ph < 7
◉ Base. Answer: any substance that reduced the h+ concentration of
a solution
pH > 7
COMPLETE QUESTIONS AND ANSWERS
◉ Hydrogen Bonds. Answer: forms when a hydrogen atom
covalently bonded to one electronegative atom is also attracted to
another electronegative atom
- in living cells the electronegative partner is usually oxygen or
nitrogen
◉ Weak Chemical Bonds. Answer: reinforce the shape of large
molecules and helps molecules adhere to each other
◉ Water. Answer: biological medium on earth
◉ Polar Molecules. Answer: the opposite ends have opposite charges
- allows water molecules to form hydrogen bonds with each other
- oxygen has a partial negative change and hydrogen has a partial
positive change
- hydrogen bonds are constantly forming and reforming
◉ Properties of Water. Answer: cohesive behavior, moderation of
temperature, expansion upon freezing, the solvent of life
,◉ Cohesion. Answer: collective, hydrogen bonds hold water
molecules together
- helps the transport of water against gravity in plants
◉ Adhesion. Answer: an attraction between different substances
-ex. water and plant cells
◉ Specific Heat. Answer: measure of how well a substance resists
changing its temperature when it absorbs or releases heat
- water's high specific heat can be traced to hydrogen bonding
◉ Evaporative Cooling. Answer: as liquid evaporates, its remaining
surface cools
- evaporative cooling of water helps stabilize temperatures in
organisms (sweating) and bodies of water
◉ Evaporation. Answer: transformation of a substance from liquid to
gas
◉ Expansion Upon Freezing. Answer: ice floats in liquid water
because hydrogen bonds in ice are more ordered, making ice less
dense
, ◉ Solution. Answer: a liquid that is a homogenous mixture of
substances
◉ Solvent. Answer: the dissolving agent of a solution
◉ Solute. Answer: the substance that is dissolved
◉ Aqueous Solution. Answer: one in which water is the solvent
- water is a versatile solvent due to its polarity
◉ Hydrophilic. Answer: one that has an affinity for water (polar)
◉ Hydrophobic. Answer: one that does not have an affinity for water
(non polar)
◉ Acid. Answer: any substance that increases the H+ concentration
of a solution
ph < 7
◉ Base. Answer: any substance that reduced the h+ concentration of
a solution
pH > 7
