HESI A2 BIOLOGY QUESTIONS VERIFIED WITH CORRECT
ANSWERS 2026/2027 VERSION
hypothesis- correct answer>>>a statement or explanation of certain events or
happenings
experiment- correct answer>>>repeatable procedure of gathering data to support or
refute the hypothesis
conclusion- correct answer>>>where the data and its significance are fully explained
aqueous- correct answer>>>water based
water molecule consists of- correct answer>>>two hydrogen atoms covalently bonded
to one oxygen atom
most significant aspect of water is- correct answer>>>the polarity of its bonds that
allows for hydrogen bonding between molecules
specific heat- correct answer>>>the amount of heat necessary to raise the temperature
of 1 gram of that molecule 1 degree celsius
water has high specific heat due to- correct answer>>>the extent of hydrogen bonding
between water molecules, which allows waters to resist shifts in temperature (ability of
oceans or large bodies of water to stabilize climates)
cohesion- correct answer>>>the ability of a molecule to stay bonded or attracted to
another molecule of the same substance (water running together on a newly waxed car)
adhesion- correct answer>>>the ability of water to bond to or attract other molecules or
substances (when water is sprayed onto the wall, some of it sticks to the wall)
when water freezes it forms- correct answer>>>lattice crystals; causing the molecules to
spread apart, resulting in the phenomenon of ice floating
polarity of water allows it to act as an- correct answer>>>versatile solvent (used to
dissolve a number of different solvents)
carbohydrates- correct answer>>>longs chains, or polymers of sugar
-used for storage, structure, and energy
-the backbone of important molecules such as DNA and RNA
kingdom- correct answer>>>largest and most inclusive category
species- correct answer>>>most restrictive category
, hierarchic organizational system- correct answer>>>kingdom, phylum, class, order,
family, genius, species
steps to an experiment- correct answer>>>1. observation
2. hypothesis
3. experiment
4. conclusion
observation- correct answer>>>data is observed and recorded/ previous data is studied
lipids- correct answer>>>known as fats, but specifically they are fatty acids,
phospholipids, and steroids
fatty acids- correct answer>>>Vary greatly but simply are grouped into two categories:
saturated and unsaturated
saturated fats- correct answer>>>contain no double bonds in their hydrogen tail
-solids at room temp
-lead to cardiovascular problems associated with diets
unsaturated fats- correct answer>>>have one or more double bonds
-liquid at room temperature
phospholipids- correct answer>>>-consist of two fatty acids of varying length bonded to
a phosphate group
-phosphate group is charged and therefore polar and soluble in water
steroids- correct answer>>>-component of membranes
-precursors to significant hormones and drugs
proteins- correct answer>>>-most significant contributor to cellular function
-polymeres of 20 molecules called amino acids
-complex, consist of several structural types and are the largest biological molecule
enzymes- correct answer>>>particular types of proteins that are used to catalyze
different reactions or processes
(physical factors such as temperature and pH can alter the activity because they have
an effect on the shape)
*enzymes speed up reactions
Nucleic Acids- correct answer>>>-components of the molecules of inheritance
-DNA and RNA
DNA deoxyribonucleic acid- correct answer>>>unique molecule specific to a particular
organism and contains the code necessary for replication
ANSWERS 2026/2027 VERSION
hypothesis- correct answer>>>a statement or explanation of certain events or
happenings
experiment- correct answer>>>repeatable procedure of gathering data to support or
refute the hypothesis
conclusion- correct answer>>>where the data and its significance are fully explained
aqueous- correct answer>>>water based
water molecule consists of- correct answer>>>two hydrogen atoms covalently bonded
to one oxygen atom
most significant aspect of water is- correct answer>>>the polarity of its bonds that
allows for hydrogen bonding between molecules
specific heat- correct answer>>>the amount of heat necessary to raise the temperature
of 1 gram of that molecule 1 degree celsius
water has high specific heat due to- correct answer>>>the extent of hydrogen bonding
between water molecules, which allows waters to resist shifts in temperature (ability of
oceans or large bodies of water to stabilize climates)
cohesion- correct answer>>>the ability of a molecule to stay bonded or attracted to
another molecule of the same substance (water running together on a newly waxed car)
adhesion- correct answer>>>the ability of water to bond to or attract other molecules or
substances (when water is sprayed onto the wall, some of it sticks to the wall)
when water freezes it forms- correct answer>>>lattice crystals; causing the molecules to
spread apart, resulting in the phenomenon of ice floating
polarity of water allows it to act as an- correct answer>>>versatile solvent (used to
dissolve a number of different solvents)
carbohydrates- correct answer>>>longs chains, or polymers of sugar
-used for storage, structure, and energy
-the backbone of important molecules such as DNA and RNA
kingdom- correct answer>>>largest and most inclusive category
species- correct answer>>>most restrictive category
, hierarchic organizational system- correct answer>>>kingdom, phylum, class, order,
family, genius, species
steps to an experiment- correct answer>>>1. observation
2. hypothesis
3. experiment
4. conclusion
observation- correct answer>>>data is observed and recorded/ previous data is studied
lipids- correct answer>>>known as fats, but specifically they are fatty acids,
phospholipids, and steroids
fatty acids- correct answer>>>Vary greatly but simply are grouped into two categories:
saturated and unsaturated
saturated fats- correct answer>>>contain no double bonds in their hydrogen tail
-solids at room temp
-lead to cardiovascular problems associated with diets
unsaturated fats- correct answer>>>have one or more double bonds
-liquid at room temperature
phospholipids- correct answer>>>-consist of two fatty acids of varying length bonded to
a phosphate group
-phosphate group is charged and therefore polar and soluble in water
steroids- correct answer>>>-component of membranes
-precursors to significant hormones and drugs
proteins- correct answer>>>-most significant contributor to cellular function
-polymeres of 20 molecules called amino acids
-complex, consist of several structural types and are the largest biological molecule
enzymes- correct answer>>>particular types of proteins that are used to catalyze
different reactions or processes
(physical factors such as temperature and pH can alter the activity because they have
an effect on the shape)
*enzymes speed up reactions
Nucleic Acids- correct answer>>>-components of the molecules of inheritance
-DNA and RNA
DNA deoxyribonucleic acid- correct answer>>>unique molecule specific to a particular
organism and contains the code necessary for replication
