Bio 93 Mock Exam Review (Test
Questions and 100% Correct Answers)
A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the
organelles. Organelles in one of the heavier fractions could produce ATP in the light, while organelles in
the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to
contain, respectively,
A) mitochondria and chloroplasts.
B) chloroplasts and peroxisomes.
C) peroxisomes and chloroplasts.
D) chloroplasts and mitochondria.
E) mitochondria and peroxisomes. *Ans*✨d
A chemist wishes to make an organic molecule less acidic. Which of the following functional groups
should be added to the molecule in order to do so?
A) carboxyl
B) sulfhydryl
C) hydroxyl
D) amino
E) phosphate *Ans*✨d
A covalent bond is likely to be polar when
A) one of the atoms sharing electrons is more electronegative than the other atom.
B) the two atoms sharing electrons are equally electronegative.
C) the two atoms sharing electrons are of the same element.
D) it is between two atoms that are both very strong electron acceptors.
E) the two atoms sharing electrons are different elements. *Ans*✨a
A covalent chemical bond is one in which
,A) electrons are removed from one atom and transferred to another atom so that the two atoms
become oppositely charged.
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.
C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of
both atoms.
D) outer-shell electrons of one atom are transferred to the inner electron shells of another atom.
E) the inner-shell electrons of one atom are transferred to the outer shell of another atom. *Ans*✨c
A molecule of CO2 is formed when 1 atom of C (atomic# 6) is covalently bonded w/ 2atoms of O
(atomic# 8). What is the total # of e- from the C atom that must be shared w/ the O atoms in order to
complete the outer electron shell of all 3 atoms?
A) 1
B) 2
C) 3
D) 4
E) 5 *Ans*✨d
Addition of a drug that blocks formation of microtubules will most directly affect which of the following
functions of a white blood cell?
a. ability to detect bacteria that are nearby
b. extension of pseudopodia
c. transport of vesicles from the golgi to the plasma membrane
d. transport of sodium ions across the membrane through the sodium potassium
pump
e. control of water flow across the membrane through aquaporin channels *Ans*✨c
All of the following are part of a prokaryotic cell except
A) DNA.
B) a cell wall.
C) an endoplasmic reticulum.
, D) ribosomes.
E) a plasma membrane. *Ans*✨c
All of the following membrane activities require energy from ATP hydrolysis except
A) facilitated diffusion.
B) active transport.
C) Na+
ions moving out of the cell.
D) proton pumps.
E) translocation of potassium into a cell. *Ans*✨a
An ionic bond is formed when:
A) the hydrogen of one water molecule is attracted to the oxygen of another water molecule
B) one atom loses an electron and another gains that electron, resulting in an attraction between the
two atoms
C) two atoms each donate electrons to a third atom
D) two atoms share the outer layer of electrons
E) one atom donates an electron becoming negative while another atom gains the electron becoming
positive *Ans*✨b
Anne was given a pet fish for her birthday, but she doesn't know if it was a freshwater or a saltwater
fish. She decides to test the water in the bowl the fish came in by submerging a piece of celery. An hour
later the celery is limp. What has she learned?
a. The celery was hypotonic to the solution, so the fish is a saltwater fish.
b. The celery was hypertonic to the solution, so the fish is a freshwater fish.
c. The celery was hypotonic to the solution, so the fish is a freshwater fish.
d. The celery was hypertonic to the solution so the fish is a saltwater fish. *Ans*✨a
Carbonic acid and bicarbonate are present in blood as a buffer. If a small amount of hydrochloric acid
(HCl) is added to the blood, we expect to see:
Questions and 100% Correct Answers)
A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the
organelles. Organelles in one of the heavier fractions could produce ATP in the light, while organelles in
the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to
contain, respectively,
A) mitochondria and chloroplasts.
B) chloroplasts and peroxisomes.
C) peroxisomes and chloroplasts.
D) chloroplasts and mitochondria.
E) mitochondria and peroxisomes. *Ans*✨d
A chemist wishes to make an organic molecule less acidic. Which of the following functional groups
should be added to the molecule in order to do so?
A) carboxyl
B) sulfhydryl
C) hydroxyl
D) amino
E) phosphate *Ans*✨d
A covalent bond is likely to be polar when
A) one of the atoms sharing electrons is more electronegative than the other atom.
B) the two atoms sharing electrons are equally electronegative.
C) the two atoms sharing electrons are of the same element.
D) it is between two atoms that are both very strong electron acceptors.
E) the two atoms sharing electrons are different elements. *Ans*✨a
A covalent chemical bond is one in which
,A) electrons are removed from one atom and transferred to another atom so that the two atoms
become oppositely charged.
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.
C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of
both atoms.
D) outer-shell electrons of one atom are transferred to the inner electron shells of another atom.
E) the inner-shell electrons of one atom are transferred to the outer shell of another atom. *Ans*✨c
A molecule of CO2 is formed when 1 atom of C (atomic# 6) is covalently bonded w/ 2atoms of O
(atomic# 8). What is the total # of e- from the C atom that must be shared w/ the O atoms in order to
complete the outer electron shell of all 3 atoms?
A) 1
B) 2
C) 3
D) 4
E) 5 *Ans*✨d
Addition of a drug that blocks formation of microtubules will most directly affect which of the following
functions of a white blood cell?
a. ability to detect bacteria that are nearby
b. extension of pseudopodia
c. transport of vesicles from the golgi to the plasma membrane
d. transport of sodium ions across the membrane through the sodium potassium
pump
e. control of water flow across the membrane through aquaporin channels *Ans*✨c
All of the following are part of a prokaryotic cell except
A) DNA.
B) a cell wall.
C) an endoplasmic reticulum.
, D) ribosomes.
E) a plasma membrane. *Ans*✨c
All of the following membrane activities require energy from ATP hydrolysis except
A) facilitated diffusion.
B) active transport.
C) Na+
ions moving out of the cell.
D) proton pumps.
E) translocation of potassium into a cell. *Ans*✨a
An ionic bond is formed when:
A) the hydrogen of one water molecule is attracted to the oxygen of another water molecule
B) one atom loses an electron and another gains that electron, resulting in an attraction between the
two atoms
C) two atoms each donate electrons to a third atom
D) two atoms share the outer layer of electrons
E) one atom donates an electron becoming negative while another atom gains the electron becoming
positive *Ans*✨b
Anne was given a pet fish for her birthday, but she doesn't know if it was a freshwater or a saltwater
fish. She decides to test the water in the bowl the fish came in by submerging a piece of celery. An hour
later the celery is limp. What has she learned?
a. The celery was hypotonic to the solution, so the fish is a saltwater fish.
b. The celery was hypertonic to the solution, so the fish is a freshwater fish.
c. The celery was hypotonic to the solution, so the fish is a freshwater fish.
d. The celery was hypertonic to the solution so the fish is a saltwater fish. *Ans*✨a
Carbonic acid and bicarbonate are present in blood as a buffer. If a small amount of hydrochloric acid
(HCl) is added to the blood, we expect to see:
