Bio 93 Midterm Review (Test Questions) with
accurate 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.
accurate 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.
