HESI A2 Biology Exam/49 Questions &
Answers (Walden University Minnesota of
Nursing)
what is the hierarchic organizational system for nomenclature? - ANS✔✔--kingdom,
phylum, class, order, family, genus, species
what does water's polarity allow for? - ANS✔✔--hydrogen bonding and versatile
solvent
what does hydrogen bonding in water cause? - ANS✔✔--high specific heat value,
strong cohesive and strong adhesive properties
what is the definition of specific heat? - ANS✔✔--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? - ANS✔✔--it is relatively high
what does a relatively high specific heat value allow for? - ANS✔✔--resists shifts in
temperature
how does the high specific heat value of water play a role in the biosphere? -
ANS✔✔--oceans and large bodies of water are able to stabilize climates
what is cohesion? - ANS✔✔--the ability of a molecule to stay bonded or attracted to
another molecule of the same substance
what is adhesion? - ANS✔✔--the ability of a molecule to bond or attract other
molecules or substances
what occurs when water freezes? - ANS✔✔--lattice crystal is formed, molecules
spread apart
what are the most important biological molecules? - ANS✔✔--carbohydrates, lipids,
proteins, nucleic acids
what are carbohydrates? - ANS✔✔--generally long chains or polymers of sugars
what are the most important functions of carbohydrates? - ANS✔✔--storage,
structure, energy
, is the phosphate head of a phospholipid water-soluble or not? - ANS✔✔--it is water-
soluble
is the hydrocarbon tail of a phospholipid water-soluble or not? - ANS✔✔--it is not
water-soluble
what are phospholipids important for? - ANS✔✔--formation of cellular membranes
what is the cellular membrane? - ANS✔✔--barrier that protects the cell
what is DNA short for? - ANS✔✔--dioxyribonucleic acid
what is RNA short for? - ANS✔✔--ribonucleic acid
what forms the backbone of DNA and RNA? - ANS✔✔--sugar-phosphate backbone
what is another term for fats? - ANS✔✔--lipids
what are the types of lipids? - ANS✔✔--fatty acids, phospholipids, steroids
what are the two types of fatty acids? - ANS✔✔--saturated and unsaturated
what is significant about saturated fat? - ANS✔✔--no double bonds in their
hydrocarbon tail
what is significant about unsaturated fat? - ANS✔✔--one or more double bonds in
their hydrocarbon tail
is saturated fat liquid or solid at room temperature? - ANS✔✔--solid
is unsaturated fat liquid or solid at room temperature? - ANS✔✔--liquid
what are cardiovascular problems associated with? - ANS✔✔--diets containing high
quantities of saturated fats
what are phospholipids? - ANS✔✔--two fatty acids of varying lengths bonded to a
phosphate group
what part of a phospholipid is charged and uncharged? - ANS✔✔--phosphate head -
charged
hydrocarbon tail - uncharged
what are steroids important for? - ANS✔✔--components of membranes and
precursors to significant hormones and drugs
Answers (Walden University Minnesota of
Nursing)
what is the hierarchic organizational system for nomenclature? - ANS✔✔--kingdom,
phylum, class, order, family, genus, species
what does water's polarity allow for? - ANS✔✔--hydrogen bonding and versatile
solvent
what does hydrogen bonding in water cause? - ANS✔✔--high specific heat value,
strong cohesive and strong adhesive properties
what is the definition of specific heat? - ANS✔✔--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? - ANS✔✔--it is relatively high
what does a relatively high specific heat value allow for? - ANS✔✔--resists shifts in
temperature
how does the high specific heat value of water play a role in the biosphere? -
ANS✔✔--oceans and large bodies of water are able to stabilize climates
what is cohesion? - ANS✔✔--the ability of a molecule to stay bonded or attracted to
another molecule of the same substance
what is adhesion? - ANS✔✔--the ability of a molecule to bond or attract other
molecules or substances
what occurs when water freezes? - ANS✔✔--lattice crystal is formed, molecules
spread apart
what are the most important biological molecules? - ANS✔✔--carbohydrates, lipids,
proteins, nucleic acids
what are carbohydrates? - ANS✔✔--generally long chains or polymers of sugars
what are the most important functions of carbohydrates? - ANS✔✔--storage,
structure, energy
, is the phosphate head of a phospholipid water-soluble or not? - ANS✔✔--it is water-
soluble
is the hydrocarbon tail of a phospholipid water-soluble or not? - ANS✔✔--it is not
water-soluble
what are phospholipids important for? - ANS✔✔--formation of cellular membranes
what is the cellular membrane? - ANS✔✔--barrier that protects the cell
what is DNA short for? - ANS✔✔--dioxyribonucleic acid
what is RNA short for? - ANS✔✔--ribonucleic acid
what forms the backbone of DNA and RNA? - ANS✔✔--sugar-phosphate backbone
what is another term for fats? - ANS✔✔--lipids
what are the types of lipids? - ANS✔✔--fatty acids, phospholipids, steroids
what are the two types of fatty acids? - ANS✔✔--saturated and unsaturated
what is significant about saturated fat? - ANS✔✔--no double bonds in their
hydrocarbon tail
what is significant about unsaturated fat? - ANS✔✔--one or more double bonds in
their hydrocarbon tail
is saturated fat liquid or solid at room temperature? - ANS✔✔--solid
is unsaturated fat liquid or solid at room temperature? - ANS✔✔--liquid
what are cardiovascular problems associated with? - ANS✔✔--diets containing high
quantities of saturated fats
what are phospholipids? - ANS✔✔--two fatty acids of varying lengths bonded to a
phosphate group
what part of a phospholipid is charged and uncharged? - ANS✔✔--phosphate head -
charged
hydrocarbon tail - uncharged
what are steroids important for? - ANS✔✔--components of membranes and
precursors to significant hormones and drugs
