BIO 111 Questions And Answers.
The slowest rate of diffusion of dye particles in water will occur at: - answer;-10 C
Which type of cell would you expect to burst when placed in a hypotonic solution? -
answer;-red blood cell
Which of the following requires adenosine triphosphate? - answer;-active transport
Cells use exocytosis to: - answer;-release substances from the cell.
The diffusion of water molecules across a selectively permeable membrane is called: -
answer;-osmosis.
Which of the following transport processes require(s) energy? - answer;-endocytosis
The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the
membranes of cells that line the intestine. This toxin prevents the movement of
positively charged sodium ions out of the intestine and into these cells. If the sodium
ions could not move into the cells, how would this affect the movement of water? -
answer;-Water would leave the cells and enter the intestines by osmosis.
A cell is placed in a hypotonic solution. What will happen? - answer;-Water will move
into the cell.
A hormone circulating in the bloodstream would most likely bind to __________. -
answer;-a receptor protein
The secretion of excess water via the contractive vacuole of a Paramecium cell is an
example of: - answer;-exocytosis.
The point at which a substance is evenly dispersed within a fluid __________. -
answer;-is referred to as dynamic equilibrium and happens when net diffusion is zero
What happens when diffusion moves molecules across the plasma membrane? -
answer;-The process is relatively slow and is driven by concentration gradients
ISO membranes are inside-out membrane vesicles used by researchers in membrane
studies. As a molecule diffuses into the vesicle, it will encounter the layers of the
membrane in the following order: - answer;-head-tail-tail-head.
The main lipids found in cell membranes are: - answer;-phospholipids.
Each substance needs a different type of transport to get into a cell. Pick the answer
choices that accurately match the type of transport needed to convey each of the
following substances into a cell.oxygen, water, sodium ions, potassium ions, bacteria
(Note that sodium ions are more concentrated outside cells than inside; potassium ions
, BIO 111 Questions And Answers.
are more concentrated inside cells than outside.) - answer;-simple diffusion, osmosis,
facilitated diffusion, active transport, endocytosis
Specialized cell junctions include all of the following EXCEPT: - answer;-
phospholipases.
Which process accounts for the movement of solids into some animal cells? - answer;-
phagocytosis
The concentration of sodium ions is lower in the cytoplasm of a heart muscle cell than it
is in the extracellular fluid. By what mechanism does the cell maintain this difference? -
answer;-active transport
Which cell junctions function to make the connections between cells leakproof? -
answer;-tight junctions
In osmosis, water diffuses from the side of the membrane with a higher concentration of
water to the side with a lower concentration of water. What determines the
concentration of water in a solution? - answer;-the amount of molecules other than
water dissolved in the solution
Glucose is a six-carbon sugar that diffuses slowly through artificial phospholipid
bilayers. The cells lining the small intestine, however, rapidly move large quantities of
glucose from the glucose-rich food into their glucose-poor cytoplasm. Given this
information, which transport mechanism is most probably functioning in the intestinal
cells? - answer;-facilitated diffusion
Many metabolic poisons work by inhibiting ATP production. Which type of transport
would be most affected? - answer;-active transport
In reference to diffusion, "passive" really means: - answer;-no energy required.
Which of the following processes does a cell use to take up molecules against their
concentration gradient? - answer;-both active transport and endocytosis
According to the fluid mosaic model of cell membranes, which of the following is a
TRUE statement about membrane phospholipids? - answer;-They form a viscous fluid
through which proteins shift and flow.
Cystic fibrosis is a genetic disease that leads to the production of excessive, thick
mucus in the respiratory tract, causing frequent and serious respiratory infections. The
defect is due to the production of a faulty membrane protein for the transport of the
chloride ion. The protein exists in membranes, but it doesn't function normally.Based on
this scenario, what is occurring at the molecular level in a person with cystic fibrosis? -
answer;-A channel protein is being adversely affected.
, BIO 111 Questions And Answers.
Osmosis is the diffusion of water molecules across selectively water-permeable
membranes. True or False? - answer;-True
When a drop of food coloring is placed in a glass of water, the spreading out of the
molecules of food dye is caused by __________. - answer;-the random movement of
molecules
Facilitated diffusion requires __________. - answer;-a membrane transport protein and
a concentration gradient
If there is a high concentration of oxygen on one side of a biological membrane, what
will happen? - answer;-The oxygen will diffuse across the membrane until the
concentration of oxygen on each side is the same.
The cytoplasm of a certain cell, such as a neuron, already has a high concentration of
K+ ions. How can K+ ions continue to enter the cell? - answer;-active transport
Active transport requires all of the following EXCEPT: - answer;-aquaporins.
The gases O2 and CO2 enter or leave a plant cell by: - answer;-simple diffusion.
________ is used by cells to consume large particles such as bacteria. - answer;-
Phagocytosis
The movement of molecules across a cell membrane in which no energy is required
(i.e., diffusion) is called ________ transport, and the movement of molecules across a
cell membrane in which energy (i.e., ATP) is required is called ________ transport. -
answer;-Active, Passive
Which of the following occurs as an enzyme produced by a cell is secreted from the
cell? - answer;-exocytosis
In biological membranes, the phospholipids are arranged in a: - answer;-bilayer with the
fatty acids pointing toward one another.
During endocytosis, the contents of the endocytic vesicle __________. - answer;-enter
the cell
The ________ portion of the cell membrane is responsible for the isolating function of
the membrane, while the ________ portion regulates exchange and communication
with the environment. - answer;-lipid; protein
Which of the following types of membrane proteins are responsible for connecting cells
to one another? - answer;-attachment proteins
, BIO 111 Questions And Answers.
Protein channels that provide passage for hormones and nutrients between animal cells
are termed: - answer;-gap junctions.
The compounds in biological membranes that form a barrier to the movement of
materials across the membrane are: - answer;-lipids.
Bacterial cells have only one DNA molecule, which is double stranded and is replicated
in essentially the same fashion as in eukaryotes. Imagine that, following the techniques
of other scientists studying DNA, you created a bacterial cell that contains only
radioactive nitrogen in its DNA. You then place the cell in a culture medium containing
only "regular" (nonradioactive) nitrogen,Based on this scenario and your knowledge of
DNA structure and replication, how many cells will contain some DNA with radioactive
nitrogen after four rounds of cell replication? - answer;-two
In eukaryotic cells, chromosomes are composed of both DNA and proteins. True or
False? - answer;-True
For the DNA sequence G-C-C-T-A-T in one polynucleotide chain, the sequence found in
the other polynucleotide chain must be: - answer;-C-G-G-A-T-A.
The number of subunits in a DNA molecule is more important to its function than the
sequence of these subunits. True or False? - answer;-False
If the quantities of the four bases in a DNA molecule are measured, we find that: -
answer;-T = A and C = G.
The basic subunits of DNA are the ________. - answer;-Nucleotides
In the comparison of a DNA molecule to a twisted ladder, the rungs of the ladder are: -
answer;-nitrogenous bases linked together.
The X-ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the
following features about DNA EXCEPT: - answer;-in a DNA molecule, A pairs with T
and G pairs with C.
The two polynucleotide chains in a DNA molecule are attached to each other by: -
answer;-hydrogen bonds between bases.
The DNA of chromosomes is composed of two strands wound about each other in the
shape of a ________. - answer;-a double helix
Imagine that you are studying a newly discovered bacterium from a hot springs in
Yellowstone National Park. When you examine the nucleotide composition of this
organism, you find that 10% of the nucleotides in its DNA are adenine (A). What
The slowest rate of diffusion of dye particles in water will occur at: - answer;-10 C
Which type of cell would you expect to burst when placed in a hypotonic solution? -
answer;-red blood cell
Which of the following requires adenosine triphosphate? - answer;-active transport
Cells use exocytosis to: - answer;-release substances from the cell.
The diffusion of water molecules across a selectively permeable membrane is called: -
answer;-osmosis.
Which of the following transport processes require(s) energy? - answer;-endocytosis
The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the
membranes of cells that line the intestine. This toxin prevents the movement of
positively charged sodium ions out of the intestine and into these cells. If the sodium
ions could not move into the cells, how would this affect the movement of water? -
answer;-Water would leave the cells and enter the intestines by osmosis.
A cell is placed in a hypotonic solution. What will happen? - answer;-Water will move
into the cell.
A hormone circulating in the bloodstream would most likely bind to __________. -
answer;-a receptor protein
The secretion of excess water via the contractive vacuole of a Paramecium cell is an
example of: - answer;-exocytosis.
The point at which a substance is evenly dispersed within a fluid __________. -
answer;-is referred to as dynamic equilibrium and happens when net diffusion is zero
What happens when diffusion moves molecules across the plasma membrane? -
answer;-The process is relatively slow and is driven by concentration gradients
ISO membranes are inside-out membrane vesicles used by researchers in membrane
studies. As a molecule diffuses into the vesicle, it will encounter the layers of the
membrane in the following order: - answer;-head-tail-tail-head.
The main lipids found in cell membranes are: - answer;-phospholipids.
Each substance needs a different type of transport to get into a cell. Pick the answer
choices that accurately match the type of transport needed to convey each of the
following substances into a cell.oxygen, water, sodium ions, potassium ions, bacteria
(Note that sodium ions are more concentrated outside cells than inside; potassium ions
, BIO 111 Questions And Answers.
are more concentrated inside cells than outside.) - answer;-simple diffusion, osmosis,
facilitated diffusion, active transport, endocytosis
Specialized cell junctions include all of the following EXCEPT: - answer;-
phospholipases.
Which process accounts for the movement of solids into some animal cells? - answer;-
phagocytosis
The concentration of sodium ions is lower in the cytoplasm of a heart muscle cell than it
is in the extracellular fluid. By what mechanism does the cell maintain this difference? -
answer;-active transport
Which cell junctions function to make the connections between cells leakproof? -
answer;-tight junctions
In osmosis, water diffuses from the side of the membrane with a higher concentration of
water to the side with a lower concentration of water. What determines the
concentration of water in a solution? - answer;-the amount of molecules other than
water dissolved in the solution
Glucose is a six-carbon sugar that diffuses slowly through artificial phospholipid
bilayers. The cells lining the small intestine, however, rapidly move large quantities of
glucose from the glucose-rich food into their glucose-poor cytoplasm. Given this
information, which transport mechanism is most probably functioning in the intestinal
cells? - answer;-facilitated diffusion
Many metabolic poisons work by inhibiting ATP production. Which type of transport
would be most affected? - answer;-active transport
In reference to diffusion, "passive" really means: - answer;-no energy required.
Which of the following processes does a cell use to take up molecules against their
concentration gradient? - answer;-both active transport and endocytosis
According to the fluid mosaic model of cell membranes, which of the following is a
TRUE statement about membrane phospholipids? - answer;-They form a viscous fluid
through which proteins shift and flow.
Cystic fibrosis is a genetic disease that leads to the production of excessive, thick
mucus in the respiratory tract, causing frequent and serious respiratory infections. The
defect is due to the production of a faulty membrane protein for the transport of the
chloride ion. The protein exists in membranes, but it doesn't function normally.Based on
this scenario, what is occurring at the molecular level in a person with cystic fibrosis? -
answer;-A channel protein is being adversely affected.
, BIO 111 Questions And Answers.
Osmosis is the diffusion of water molecules across selectively water-permeable
membranes. True or False? - answer;-True
When a drop of food coloring is placed in a glass of water, the spreading out of the
molecules of food dye is caused by __________. - answer;-the random movement of
molecules
Facilitated diffusion requires __________. - answer;-a membrane transport protein and
a concentration gradient
If there is a high concentration of oxygen on one side of a biological membrane, what
will happen? - answer;-The oxygen will diffuse across the membrane until the
concentration of oxygen on each side is the same.
The cytoplasm of a certain cell, such as a neuron, already has a high concentration of
K+ ions. How can K+ ions continue to enter the cell? - answer;-active transport
Active transport requires all of the following EXCEPT: - answer;-aquaporins.
The gases O2 and CO2 enter or leave a plant cell by: - answer;-simple diffusion.
________ is used by cells to consume large particles such as bacteria. - answer;-
Phagocytosis
The movement of molecules across a cell membrane in which no energy is required
(i.e., diffusion) is called ________ transport, and the movement of molecules across a
cell membrane in which energy (i.e., ATP) is required is called ________ transport. -
answer;-Active, Passive
Which of the following occurs as an enzyme produced by a cell is secreted from the
cell? - answer;-exocytosis
In biological membranes, the phospholipids are arranged in a: - answer;-bilayer with the
fatty acids pointing toward one another.
During endocytosis, the contents of the endocytic vesicle __________. - answer;-enter
the cell
The ________ portion of the cell membrane is responsible for the isolating function of
the membrane, while the ________ portion regulates exchange and communication
with the environment. - answer;-lipid; protein
Which of the following types of membrane proteins are responsible for connecting cells
to one another? - answer;-attachment proteins
, BIO 111 Questions And Answers.
Protein channels that provide passage for hormones and nutrients between animal cells
are termed: - answer;-gap junctions.
The compounds in biological membranes that form a barrier to the movement of
materials across the membrane are: - answer;-lipids.
Bacterial cells have only one DNA molecule, which is double stranded and is replicated
in essentially the same fashion as in eukaryotes. Imagine that, following the techniques
of other scientists studying DNA, you created a bacterial cell that contains only
radioactive nitrogen in its DNA. You then place the cell in a culture medium containing
only "regular" (nonradioactive) nitrogen,Based on this scenario and your knowledge of
DNA structure and replication, how many cells will contain some DNA with radioactive
nitrogen after four rounds of cell replication? - answer;-two
In eukaryotic cells, chromosomes are composed of both DNA and proteins. True or
False? - answer;-True
For the DNA sequence G-C-C-T-A-T in one polynucleotide chain, the sequence found in
the other polynucleotide chain must be: - answer;-C-G-G-A-T-A.
The number of subunits in a DNA molecule is more important to its function than the
sequence of these subunits. True or False? - answer;-False
If the quantities of the four bases in a DNA molecule are measured, we find that: -
answer;-T = A and C = G.
The basic subunits of DNA are the ________. - answer;-Nucleotides
In the comparison of a DNA molecule to a twisted ladder, the rungs of the ladder are: -
answer;-nitrogenous bases linked together.
The X-ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the
following features about DNA EXCEPT: - answer;-in a DNA molecule, A pairs with T
and G pairs with C.
The two polynucleotide chains in a DNA molecule are attached to each other by: -
answer;-hydrogen bonds between bases.
The DNA of chromosomes is composed of two strands wound about each other in the
shape of a ________. - answer;-a double helix
Imagine that you are studying a newly discovered bacterium from a hot springs in
Yellowstone National Park. When you examine the nucleotide composition of this
organism, you find that 10% of the nucleotides in its DNA are adenine (A). What
