HESI A2 BIOLOGY EXAM Questions And Answers
What does hydrogen bonding in water cause? - ANSWER -high specific heat value,
strong cohesive and strong adhesive properties
What is the definition of specific heat? - ANSWER -the amount of heat necessary to
raise the temperature of one gram of that...
HESI A2 BIOLOGY EXAM Questions And Answers
What does hydrogen bonding in water cause? - ANSWER -high specific heat value,
strong cohesive and strong adhesive properties
What is the definition of specific heat? - ANSWER -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? - ANSWER -it is relatively high
What does a relatively high specific heat value allow for? - ANSWER -resists shifts in
temperature
How does the high specific heat value of water play a role in the biosphere? -
ANSWER -oceans and large bodies of water are able to stabilize climates
What is cohesion? - ANSWER -the ability of a molecule to stay bonded or attracted to
another molecule of the same substance
What is adhesion? - ANSWER -the ability of a molecule to bond or attract other
molecules or substances
What occurs when water freezes? - ANSWER -lattice crystal is formed, molecules
spread apart
What are the most important biological molecules? - ANSWER -carbohydrates, lipids,
proteins, nucleic acids
What are carbohydrates? - ANSWER -generally long chains or polymers of sugars
What are the most important functions of carbohydrates? - ANSWER -storage,
structure, energy
What is DNA short for? - ANSWER -dioxyribonucleic acid
What is RNA short for? - ANSWER -ribonucleic acid
What forms the backbone of DNA and RNA? - ANSWER -sugar-phosphate backbone
What is another term for fats? - ANSWER -lipids
What are the types of lipids? - ANSWER -fatty acids, phospholipids, steroids
What are the two types of fatty acids? - ANSWER -saturated and unsaturated
, What is significant about saturated fat? - ANSWER -no double bonds in their
hydrocarbon tail
What is significant about unsaturated fat? - ANSWER -one or more double bonds in
their hydrocarbon tail
Is saturated fat liquid or solid at room temperature? - ANSWER -solid
Is unsaturated fat liquid or solid at room temperature? - ANSWER -liquid
What are cardiovascular problems associated with? - ANSWER -diets containing high
quantities of saturated fats
What are phospholipids? - ANSWER -two fatty acids of varying lengths bonded to a
phosphate group
What part of a phospholipid is charged and uncharged? - ANSWER -phosphate head -
charged
Hydrocarbon tail - uncharged
Is the phosphate head of a phospholipid water-soluble or not? - ANSWER -it is water-
soluble
Is the hydrocarbon tail of a phospholipid water-soluble or not? - ANSWER -it is not
water-soluble
What are phospholipids important for? - ANSWER -formation of cellular membranes
What is the cellular membrane? - ANSWER -barrier that protects the cell
What are steroids important for? - ANSWER -components of membranes and
precursors to significant hormones and drugs
What are proteins most significant for? - ANSWER -cellular function
What are proteins made of? - ANSWER -20 molecules called amino acids
What is the largest biological molecule? - ANSWER -protein
What are enzymes? - ANSWER -proteins that act to catalyze different reactions or
processes
What are nucleic acids? - ANSWER -molecules of inheritance
What is necessary for replication? - ANSWER -DNA
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