HESI A2 EXAM – BIOLOGY WITH 100%
CORRECT ANSWERS 2025
what is the hierarchic organizational system for nomenclature?
correct answers >> kingdom, phylum, class, order, family,
genus, species
what are the steps of the scientific method? correct answers
>> observation, hypothesis, experiment, conclusion
what is the chemical composition of water? correct answers
>> two hydrogen atoms covalently bonded to an oxygen atom
what is the most significant aspect of water? correct answers
>> polarity of its bond
what does water's polarity allow for? correct answers >>
hydrogen bonding and versatile solvent
what does hydrogen bonding in water cause? correct answers
>> high specific heat value, strong cohesive and strong
adhesive properties
what is the definition of specific heat? correct answers >>
the amount of heat necessary to raise the temperature of one
gram of that molecule by one degree Celsius
,what is good to note about water's specific heat value? correct
answers >> it is relatively high
what does a relatively high specific heat value allow for?
correct answers >> resists shifts in temperature
how does the high specific heat value of water play a role in the
biosphere? correct answers >> oceans and large bodies of
water are able to stabilize climates
what is cohesion? correct answers >> the ability of a
molecule to stay bonded or attracted to another molecule of the
same substance
what is adhesion? correct answers >> the ability of a
molecule to bond or attract other molecules or substances
what occurs when water freezes? correct answers >> lattice
crystal is formed, molecules spread apart
what are the most important biological molecules? correct
answers >> carbohydrates, lipids, proteins, nucleic acids
what are carbohydrates? correct answers >> generally long
chains or polymers of sugars
what are the most important functions of carbohydrates?
correct answers >> storage, structure, energy
, what is DNA short for? correct answers >> dioxyribonucleic
acid
what is RNA short for? correct answers >> ribonucleic acid
what forms the backbone of DNA and RNA? correct answers
>> sugar-phosphate backbone
what is another term for fats? correct answers >> lipids
what are the types of lipids? correct answers >> fatty acids,
phospholipids, steroids
what are the two types of fatty acids? correct answers >>
saturated and unsaturated
what is significant about saturated fat? correct answers >>
no double bonds in their hydrocarbon tail
what is significant about unsaturated fat? correct answers >>
one or more double bonds in their hydrocarbon tail
is saturated fat liquid or solid at room temperature? correct
answers >> solid
is unsaturated fat liquid or solid at room temperature? correct
answers >> liquid
CORRECT ANSWERS 2025
what is the hierarchic organizational system for nomenclature?
correct answers >> kingdom, phylum, class, order, family,
genus, species
what are the steps of the scientific method? correct answers
>> observation, hypothesis, experiment, conclusion
what is the chemical composition of water? correct answers
>> two hydrogen atoms covalently bonded to an oxygen atom
what is the most significant aspect of water? correct answers
>> polarity of its bond
what does water's polarity allow for? correct answers >>
hydrogen bonding and versatile solvent
what does hydrogen bonding in water cause? correct answers
>> high specific heat value, strong cohesive and strong
adhesive properties
what is the definition of specific heat? correct answers >>
the amount of heat necessary to raise the temperature of one
gram of that molecule by one degree Celsius
,what is good to note about water's specific heat value? correct
answers >> it is relatively high
what does a relatively high specific heat value allow for?
correct answers >> resists shifts in temperature
how does the high specific heat value of water play a role in the
biosphere? correct answers >> oceans and large bodies of
water are able to stabilize climates
what is cohesion? correct answers >> the ability of a
molecule to stay bonded or attracted to another molecule of the
same substance
what is adhesion? correct answers >> the ability of a
molecule to bond or attract other molecules or substances
what occurs when water freezes? correct answers >> lattice
crystal is formed, molecules spread apart
what are the most important biological molecules? correct
answers >> carbohydrates, lipids, proteins, nucleic acids
what are carbohydrates? correct answers >> generally long
chains or polymers of sugars
what are the most important functions of carbohydrates?
correct answers >> storage, structure, energy
, what is DNA short for? correct answers >> dioxyribonucleic
acid
what is RNA short for? correct answers >> ribonucleic acid
what forms the backbone of DNA and RNA? correct answers
>> sugar-phosphate backbone
what is another term for fats? correct answers >> lipids
what are the types of lipids? correct answers >> fatty acids,
phospholipids, steroids
what are the two types of fatty acids? correct answers >>
saturated and unsaturated
what is significant about saturated fat? correct answers >>
no double bonds in their hydrocarbon tail
what is significant about unsaturated fat? correct answers >>
one or more double bonds in their hydrocarbon tail
is saturated fat liquid or solid at room temperature? correct
answers >> solid
is unsaturated fat liquid or solid at room temperature? correct
answers >> liquid
