Microbiology: A Systems Approach, 7th Edition by
Cowan & Smith | Complete 2025/2026 With Detailed
Answers
_____________________________________________________________________________________
All of the following are correct about prokaryotes, except
a) they are smaller than eukaryotes
b) they are found nearly everywhere
c) they lack a nucleus
d) they are less complex than eukaryotes
e) they have organelles
➢ e) they have organelles
The DNA of microorganisms is made up of subunits called
a) mRNA
b) nucleotides
c) histones
d) polymerases
e) amino acids
➢ b) nucleotides
A covalent bond is formed between an anion and cation
a) true
b) false
➢ b) false
All microorganisms are parasites
a) true
b) false
➢ b) false
Cations are ________
a) charged subatomic particles
b) atoms without protons
c) atoms that have gained electrons
d) radioactive isotopes
e) capable of forming ionic bonds with anions
➢ e) capable of forming ionic bonds with anions
, Water molecules are nonpolar molecules.
a) true
b) false
➢ b) false
The alpha helix and beta pleated sheet are examples of:
a) tertiary structures
b) quarternary structures
c) primary structures
d) secondary structures
e) gamma structures
➢ d) secondary structures
how many times more acidic is a solution with a pH of 3 than a solution with a pH of 6?
a) 3
b) 10
c) 1000
d) 63
e) 36
➢ c) 1000
A halophile would grow best in
a) hot geyser springs
b) arid, desert soil
c) acid pools
d) fresh water ponds
e) salt lakes
➢ e) salt lakes
Two or more atoms bonded together are called a/an
a) electrolyte
b) ion
c) isotope
d) molecule
e) element
➢ d) molecule
Which term does NOT belong in this list?
a) acidic
b) vinegar
c) hydrogen ion donor
d) pH 8
e) lactic acid
Cowan & Smith | Complete 2025/2026 With Detailed
Answers
_____________________________________________________________________________________
All of the following are correct about prokaryotes, except
a) they are smaller than eukaryotes
b) they are found nearly everywhere
c) they lack a nucleus
d) they are less complex than eukaryotes
e) they have organelles
➢ e) they have organelles
The DNA of microorganisms is made up of subunits called
a) mRNA
b) nucleotides
c) histones
d) polymerases
e) amino acids
➢ b) nucleotides
A covalent bond is formed between an anion and cation
a) true
b) false
➢ b) false
All microorganisms are parasites
a) true
b) false
➢ b) false
Cations are ________
a) charged subatomic particles
b) atoms without protons
c) atoms that have gained electrons
d) radioactive isotopes
e) capable of forming ionic bonds with anions
➢ e) capable of forming ionic bonds with anions
, Water molecules are nonpolar molecules.
a) true
b) false
➢ b) false
The alpha helix and beta pleated sheet are examples of:
a) tertiary structures
b) quarternary structures
c) primary structures
d) secondary structures
e) gamma structures
➢ d) secondary structures
how many times more acidic is a solution with a pH of 3 than a solution with a pH of 6?
a) 3
b) 10
c) 1000
d) 63
e) 36
➢ c) 1000
A halophile would grow best in
a) hot geyser springs
b) arid, desert soil
c) acid pools
d) fresh water ponds
e) salt lakes
➢ e) salt lakes
Two or more atoms bonded together are called a/an
a) electrolyte
b) ion
c) isotope
d) molecule
e) element
➢ d) molecule
Which term does NOT belong in this list?
a) acidic
b) vinegar
c) hydrogen ion donor
d) pH 8
e) lactic acid
