BIO 172 UNIT 1 EXAM WITH 100%
CORRECT ANSWERS 2026
You are a scientist studying how stomach ulcers form. You look at
3 of your 10 patients and find that all three contain a particular
species of bacteria, Helicobacter pylori. Which statement about
your ongoing study follows the scientific method?
A) You propose a new hypothesis stating that Helicobacter pylori
is the cause of stomach ulcers.
B) You propose a new theory for the cause of ulcer formation,
attributing the disease to Helicobacter pylori.
C)You present the null theory that most stomach ulcers are
caused by stress.
D) You present the fact to your colleagues that stomach ulcers
are caused by Helicobacter pylori. correct answer A
Which statement about the tree of life is true?
A) Archea and Bacteria are found on the same branches
B) Archea and Eukaryotes are found on the same braches
,C) The branches indicate that species arose from modifications
from a common ancestor
D) Multiple branches indicates that species descended from very
different ancestors correct answer C
Which of these is true?
A) As pH increases, [H+] decreases.
B) As pH decreases, [H+] decreases.
C) None of the answers are correct
D) As pH increases, [H+] increases. correct answer A
The sequence of amino acids in a polypeptide chain is called
A) tertiary structure
B) secondary structure
C) quaternary structure
D) primary structure correct answer D
If an atom has a charge of +2, which of the following must be
true?
A) It has two more protons than neutrons
B) It has fewer protons than it has electrons
C) It has at least three valence electrons
D) It has fewer electrons than it has protons correct answer D
, Which of the following statements is true concerning a property of
water?
A) Water has a low specific heat index therefore water only needs
a small input of energy to cause a dramatic change in
temperature
B) Water has a high specific heat index therefore water only
needs a small input of energy to cause a dramatic change in its
temperature
C) Water has a low specific heat index therefore water can absorb
a great deal of heat with resulting in only a small change in
temperature
D) Water has a high specific heat index therefore water can
absorb a great deal of heat resulting in only a small change in
temperature correct answer D
Which of the following levels of protein structure does not contain
hydrogen bonds?
A) tertiary
B) secondary
C) primary
D) quaternary correct answer C
Chemical bonds where electrons are shared equally are called
A) hydrogen bonds
B) polar covalent bonds
CORRECT ANSWERS 2026
You are a scientist studying how stomach ulcers form. You look at
3 of your 10 patients and find that all three contain a particular
species of bacteria, Helicobacter pylori. Which statement about
your ongoing study follows the scientific method?
A) You propose a new hypothesis stating that Helicobacter pylori
is the cause of stomach ulcers.
B) You propose a new theory for the cause of ulcer formation,
attributing the disease to Helicobacter pylori.
C)You present the null theory that most stomach ulcers are
caused by stress.
D) You present the fact to your colleagues that stomach ulcers
are caused by Helicobacter pylori. correct answer A
Which statement about the tree of life is true?
A) Archea and Bacteria are found on the same branches
B) Archea and Eukaryotes are found on the same braches
,C) The branches indicate that species arose from modifications
from a common ancestor
D) Multiple branches indicates that species descended from very
different ancestors correct answer C
Which of these is true?
A) As pH increases, [H+] decreases.
B) As pH decreases, [H+] decreases.
C) None of the answers are correct
D) As pH increases, [H+] increases. correct answer A
The sequence of amino acids in a polypeptide chain is called
A) tertiary structure
B) secondary structure
C) quaternary structure
D) primary structure correct answer D
If an atom has a charge of +2, which of the following must be
true?
A) It has two more protons than neutrons
B) It has fewer protons than it has electrons
C) It has at least three valence electrons
D) It has fewer electrons than it has protons correct answer D
, Which of the following statements is true concerning a property of
water?
A) Water has a low specific heat index therefore water only needs
a small input of energy to cause a dramatic change in
temperature
B) Water has a high specific heat index therefore water only
needs a small input of energy to cause a dramatic change in its
temperature
C) Water has a low specific heat index therefore water can absorb
a great deal of heat with resulting in only a small change in
temperature
D) Water has a high specific heat index therefore water can
absorb a great deal of heat resulting in only a small change in
temperature correct answer D
Which of the following levels of protein structure does not contain
hydrogen bonds?
A) tertiary
B) secondary
C) primary
D) quaternary correct answer C
Chemical bonds where electrons are shared equally are called
A) hydrogen bonds
B) polar covalent bonds
