PURDUE UNIVERSITY BIOL 203 EXAM 1
REVIEW 2026/2027 WITH 350
QUESTIONS AND EXPERT-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ | GUARANTEED SUCCESS
If a cell is placed in a fluid where the concentration of solute is higher than found
in the cell, the fluid is said to be _________. Water will leave the cell, resulting in
cell shrinkage. - ANSWER-hypertonic
If a cell is placed in a fluid where the concentration of solute is lower than found in
the cell, the fluid is said to be _________. Water will rush into the cell, resulting in
cell bursting. - ANSWER-hypotonic
If a cell is placed in a fluid where the concentration of solute is equal to that found
in the cell, the fluid is said to be _________. Water will flow both in and out of the
cell relatively equally. - ANSWER-isotonic
What is osmotic pressure? - ANSWER-The pressure that causes water to flow
from a region of low solute concentration to a region of high solute concentration
,Inorganic Substances never contain what two elements - ANSWER-Carbon and
Hydrogen
Organic Compounds always contain what two elements - ANSWER-Carbon and
Hydrogen
What are the four important categories of organic compounds? - ANSWER-
Carbohydrates, Lipids, Proteins, Nucleic Acids
Carbohydrates always contain - ANSWER-Carbon, Hydrogen, and Oxygen
What is the purpose of carbohydrates? - ANSWER-They are burned by the cells of
the body to produce energy
Monosaccharides - ANSWER-Example- glucose and fructose/ they are the
building blocks for more complex carbohydrates
Disaccharides - ANSWER-Example-sucrose, lactose, maltose/ two molecules of
simple carbohydrates covalently bonded together
Polysaccharides - ANSWER-Example- glycogen/ Carbohydrates that are made up
of more than two monosaccharides
Are lipids soluble in water? - ANSWER-no, insoluble
Trigylcerides - ANSWER-lipids that have 3 fatty acids tails linked to glycerol used
as a source of fuel/ can be saturated or unsaturated
,Phospholipids - ANSWER-a lipid consisting of a glycerol bound to two fatty acids
and a phosphate group/ important in the plasma membranes of cells
Steroids - ANSWER-multiple-ring structure
Proteins structure - ANSWER-chains of amino acid monomers linked by peptide
bonds
Examples of enzymes that are proteins - ANSWER-albumin, hemoglobin,
collagen, amylase
examples of amino acids - ANSWER-leucine, alanine, glycine, phenylaline, serine
What is denaturation? - ANSWER-when acidity or heat breaks the hydrogen bonds
and causes the enzyme to not be able to function properly
The amino acid sequence is important in determining what about a protein -
ANSWER-the properties and how it folds
What are the monomers of nucleic acids? - ANSWER-nucleotides joined by
covalent bonds
Each nucleotide consists of - ANSWER-a nitrogenous base, a pentose sugar, and
one or more phosphate groups
, What are examples of Nitrogen-containing bases in DNA? Which one isnt present
in RNA? What does RNA have instead - ANSWER-Adenine, guanine, cytosine,
thymine/ thymine not in RNA/ RNA has uracil instead
Difference between DNA and RNA - ANSWER-DNA has a H, RNA has OH
How many phosphate groups does ATP have? - ANSWER-three
What is the plasma membrane made of? - ANSWER-phospholipid bilayer
What are microvilli? - ANSWER-fingerlike extensions of the plasma membrane
that increase epithilial tissues surface area. (Look like hairs)
What kind of substances is the cell lipid bilayer permeable to? What is it
impermeable to? - ANSWER-lipid soluable/ water soluable
What two things determine the fluidity of the plasma membrane? - ANSWER-
Fatty acids (whether they are saturated or unsaturated) & cholesterol
What type of lipid is found in the outer layer of the plasma membrane? -
ANSWER-Glycolipids
How can you change the properties of the phospholipid bilayer? - ANSWER-Add
proteins to the surface or integrate them within the membrane
What are the two ways proteins may be associated with the membrane -
ANSWER-integral protein/ peripheral protein
REVIEW 2026/2027 WITH 350
QUESTIONS AND EXPERT-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ | GUARANTEED SUCCESS
If a cell is placed in a fluid where the concentration of solute is higher than found
in the cell, the fluid is said to be _________. Water will leave the cell, resulting in
cell shrinkage. - ANSWER-hypertonic
If a cell is placed in a fluid where the concentration of solute is lower than found in
the cell, the fluid is said to be _________. Water will rush into the cell, resulting in
cell bursting. - ANSWER-hypotonic
If a cell is placed in a fluid where the concentration of solute is equal to that found
in the cell, the fluid is said to be _________. Water will flow both in and out of the
cell relatively equally. - ANSWER-isotonic
What is osmotic pressure? - ANSWER-The pressure that causes water to flow
from a region of low solute concentration to a region of high solute concentration
,Inorganic Substances never contain what two elements - ANSWER-Carbon and
Hydrogen
Organic Compounds always contain what two elements - ANSWER-Carbon and
Hydrogen
What are the four important categories of organic compounds? - ANSWER-
Carbohydrates, Lipids, Proteins, Nucleic Acids
Carbohydrates always contain - ANSWER-Carbon, Hydrogen, and Oxygen
What is the purpose of carbohydrates? - ANSWER-They are burned by the cells of
the body to produce energy
Monosaccharides - ANSWER-Example- glucose and fructose/ they are the
building blocks for more complex carbohydrates
Disaccharides - ANSWER-Example-sucrose, lactose, maltose/ two molecules of
simple carbohydrates covalently bonded together
Polysaccharides - ANSWER-Example- glycogen/ Carbohydrates that are made up
of more than two monosaccharides
Are lipids soluble in water? - ANSWER-no, insoluble
Trigylcerides - ANSWER-lipids that have 3 fatty acids tails linked to glycerol used
as a source of fuel/ can be saturated or unsaturated
,Phospholipids - ANSWER-a lipid consisting of a glycerol bound to two fatty acids
and a phosphate group/ important in the plasma membranes of cells
Steroids - ANSWER-multiple-ring structure
Proteins structure - ANSWER-chains of amino acid monomers linked by peptide
bonds
Examples of enzymes that are proteins - ANSWER-albumin, hemoglobin,
collagen, amylase
examples of amino acids - ANSWER-leucine, alanine, glycine, phenylaline, serine
What is denaturation? - ANSWER-when acidity or heat breaks the hydrogen bonds
and causes the enzyme to not be able to function properly
The amino acid sequence is important in determining what about a protein -
ANSWER-the properties and how it folds
What are the monomers of nucleic acids? - ANSWER-nucleotides joined by
covalent bonds
Each nucleotide consists of - ANSWER-a nitrogenous base, a pentose sugar, and
one or more phosphate groups
, What are examples of Nitrogen-containing bases in DNA? Which one isnt present
in RNA? What does RNA have instead - ANSWER-Adenine, guanine, cytosine,
thymine/ thymine not in RNA/ RNA has uracil instead
Difference between DNA and RNA - ANSWER-DNA has a H, RNA has OH
How many phosphate groups does ATP have? - ANSWER-three
What is the plasma membrane made of? - ANSWER-phospholipid bilayer
What are microvilli? - ANSWER-fingerlike extensions of the plasma membrane
that increase epithilial tissues surface area. (Look like hairs)
What kind of substances is the cell lipid bilayer permeable to? What is it
impermeable to? - ANSWER-lipid soluable/ water soluable
What two things determine the fluidity of the plasma membrane? - ANSWER-
Fatty acids (whether they are saturated or unsaturated) & cholesterol
What type of lipid is found in the outer layer of the plasma membrane? -
ANSWER-Glycolipids
How can you change the properties of the phospholipid bilayer? - ANSWER-Add
proteins to the surface or integrate them within the membrane
What are the two ways proteins may be associated with the membrane -
ANSWER-integral protein/ peripheral protein
