PURDUE BIO 203 EXAM 3 NEWEST 2025
EXAM QUESTIONS AND DETAILED
CORRECT ANSWERS | A+ GRADE
What is the difference between an atom and a molecule?
Correct Answer A molecule is two or more atoms formed
together
Difference between simple and structural formulas..
Correct Answer simple formulas show you what elements
and how much are in each substance and the structural
shows how they are bonded
define acids and bases Correct Answer acids are
substances with pH lower than 7 and bases have pH
higher than 7
difference between electrolytes and salts Correct Answer
Electrolytes are salts plus more nutritional value
define pH Correct Answer alkalinity or acidity of a specific
substance
List 4 major inorganic substances Correct Answer water,
oxygen, carbon dioxide, inorganic salts
List 4 major organic substances in the body and their
functions. Correct Answer lipids ( acting as chemical
,messengers, storage and provision of energy),
carbohydrates (provide body with energy and regulates
glucose), proteins (required for function and regulation of
body's tissues), nucleic acid (genetic info)
What is a solute? Correct Answer solid component of
solution
What is a solvent? Correct Answer liquid component of
solution
Which direction does water usually move within a cell?
Correct Answer Areas of high water potential ---> areas of
low water potential
What does it mean for a cell to be Hypertonic? Correct
Answer Cell loses water weight; there is more solute
inside the cell that flows OUT
Plasma Membrane Correct Answer encloses the
cytoplasm, made up of phospholipid molecules, polar +
hydrophilic heads with non-polar + hydrophobic tails
Microvilli Correct Answer fingerlike of the plasma
membrane the increases surface area and
absorption...NON-MOVING
Desmosomes Correct Answer localized patch that holds
two cells together
, Tight Junction Correct Answer seals space between cells;
fusing membranes
Gap Junctions Correct Answer communicating junctions;
usually between cardiac muscles and helps contractions
compliment each other
Endoplasmic Reticulum Correct Answer "in-cell network"
also protein and lipid synthesis
What classifies the ER as rough ER? Correct Answer
ribosomes are present on the ER
Golgi apparatus Correct Answer packages newly made
proteins for delivery and export
Mitochondria Correct Answer IMPORTANT IN ATP
PRODUCTION; can be transferred between cells and has
tunneling nanotubes that form between cells and mediate
intercellular communication
Lysosomes Correct Answer garbage disposal; enzymes
capable of digesting capable of digesting cellular
substances and dead organelles
centrosomes Correct Answer contains centrosomes which
the spindle fibers develop from in cellular division
Peroxisomes Correct Answer important in hydrogen
peroxide and fatty acid metabolism
EXAM QUESTIONS AND DETAILED
CORRECT ANSWERS | A+ GRADE
What is the difference between an atom and a molecule?
Correct Answer A molecule is two or more atoms formed
together
Difference between simple and structural formulas..
Correct Answer simple formulas show you what elements
and how much are in each substance and the structural
shows how they are bonded
define acids and bases Correct Answer acids are
substances with pH lower than 7 and bases have pH
higher than 7
difference between electrolytes and salts Correct Answer
Electrolytes are salts plus more nutritional value
define pH Correct Answer alkalinity or acidity of a specific
substance
List 4 major inorganic substances Correct Answer water,
oxygen, carbon dioxide, inorganic salts
List 4 major organic substances in the body and their
functions. Correct Answer lipids ( acting as chemical
,messengers, storage and provision of energy),
carbohydrates (provide body with energy and regulates
glucose), proteins (required for function and regulation of
body's tissues), nucleic acid (genetic info)
What is a solute? Correct Answer solid component of
solution
What is a solvent? Correct Answer liquid component of
solution
Which direction does water usually move within a cell?
Correct Answer Areas of high water potential ---> areas of
low water potential
What does it mean for a cell to be Hypertonic? Correct
Answer Cell loses water weight; there is more solute
inside the cell that flows OUT
Plasma Membrane Correct Answer encloses the
cytoplasm, made up of phospholipid molecules, polar +
hydrophilic heads with non-polar + hydrophobic tails
Microvilli Correct Answer fingerlike of the plasma
membrane the increases surface area and
absorption...NON-MOVING
Desmosomes Correct Answer localized patch that holds
two cells together
, Tight Junction Correct Answer seals space between cells;
fusing membranes
Gap Junctions Correct Answer communicating junctions;
usually between cardiac muscles and helps contractions
compliment each other
Endoplasmic Reticulum Correct Answer "in-cell network"
also protein and lipid synthesis
What classifies the ER as rough ER? Correct Answer
ribosomes are present on the ER
Golgi apparatus Correct Answer packages newly made
proteins for delivery and export
Mitochondria Correct Answer IMPORTANT IN ATP
PRODUCTION; can be transferred between cells and has
tunneling nanotubes that form between cells and mediate
intercellular communication
Lysosomes Correct Answer garbage disposal; enzymes
capable of digesting capable of digesting cellular
substances and dead organelles
centrosomes Correct Answer contains centrosomes which
the spindle fibers develop from in cellular division
Peroxisomes Correct Answer important in hydrogen
peroxide and fatty acid metabolism
