BIOL 4100 Exam 4 Questions With Complete Solutions
_____________ give the plant cell wall its tensile strength
Correct Answers cellulose microfibrils
actin filaments Correct Answers helical polymers of the
protein actin; flexible structures that are organized into a variety
of linear bundles, two-dimensional networks, and three-
dimensional gels
Adherens junctions Correct Answers cadherin is attached to
actin filaments inside the cell
Albinism is caused by a recessive mutation. If two albino mice
mate and produce offspring with normal pigmentation, what
could you conclude about the parental mutations? Correct
Answers The two mutations are in different genes.
An actin-binding protein called cofilin binds preferentially to
ADP-containing actin filaments rather than ATP-containing
actin filaments. Based on this preference, which is true? Correct
Answers Cofilin binds to older actin filaments.
An experiment was performed to determine the role that ATP
plays in kinesin movement along microtubules. Kinesin and
microtubules were incubated together in a test tube, but instead
of ATP, a non-hydrolyzable analog of ATP was added to the
tube. What impact on kinesin function do you expect to observe
in the presence of this ATP analog? Correct Answers The
kinesin would bind tightly to microtubules and not release.
,As a cell grows, which microtubule-associated protein pulls the
ER membrane outward, stretching it like a net? Correct
Answers kinesin
Cdk inhibitors inhibit the function of cyclin-dependent protein
kinases. Different inhibitors display varying mechanisms of Cdk
inhibition. Which of the following might a Cdk inhibitor block
in order to block Cdk function? Correct Answers A.cyclin
binding
C.substrate binding
D.ATP binding
Chris and Sam's first child was born with cystic fibrosis, a
recessive disorder caused by mutations in a chromosome 7 gene
called CFTR. Symptoms include frequent lung infections that
result from buildup of thick mucus. Neither parent has cystic
fibrosis, and they were surprised when their first child was
diagnosed with this genetic disorder. What is the percent chance
that their next child will also have cystic fibrosis? Correct
Answers 25%
Collagen is made mainly by Correct Answers fibroblasts
cytoskeleton Correct Answers collection of multiple types of
protein filaments that provide shape, support, movement, and
intercellular transport
Defects in ________ can cause a rare class of premature aging
disorders called progeria Correct Answers nuclear lamin
, Describe collagen fibrils in skin Correct Answers woven into a
wickerwork pattern with alternating layers of different
orientation
Describe the makeup of collagen Correct Answers long, stiff
triple-stranded helical bundle
Desmosomes Correct Answers Anchoring junctions that
prevent cells from being pulled apart
During which division process(es) are the kinetochores of both
sister chromatids captured by microtubules from the same
spindle pole? Correct Answers meiosis I
Epithelial Sheets are polarized and rest on Correct Answers a
Basal Lamina
Epithelial sheets cell types Correct Answers Absorptive and
goblet
Every kind of epithelial cells has a distinct keratin filament
composed of _________ Correct Answers a mixture of keratin
subunits
Fibronectin Correct Answers connects cell surface receptors to
the extracellular collagen fibrils
Fibronectin provides the link between Correct Answers cell
attachment proteins and the ECM
_____________ give the plant cell wall its tensile strength
Correct Answers cellulose microfibrils
actin filaments Correct Answers helical polymers of the
protein actin; flexible structures that are organized into a variety
of linear bundles, two-dimensional networks, and three-
dimensional gels
Adherens junctions Correct Answers cadherin is attached to
actin filaments inside the cell
Albinism is caused by a recessive mutation. If two albino mice
mate and produce offspring with normal pigmentation, what
could you conclude about the parental mutations? Correct
Answers The two mutations are in different genes.
An actin-binding protein called cofilin binds preferentially to
ADP-containing actin filaments rather than ATP-containing
actin filaments. Based on this preference, which is true? Correct
Answers Cofilin binds to older actin filaments.
An experiment was performed to determine the role that ATP
plays in kinesin movement along microtubules. Kinesin and
microtubules were incubated together in a test tube, but instead
of ATP, a non-hydrolyzable analog of ATP was added to the
tube. What impact on kinesin function do you expect to observe
in the presence of this ATP analog? Correct Answers The
kinesin would bind tightly to microtubules and not release.
,As a cell grows, which microtubule-associated protein pulls the
ER membrane outward, stretching it like a net? Correct
Answers kinesin
Cdk inhibitors inhibit the function of cyclin-dependent protein
kinases. Different inhibitors display varying mechanisms of Cdk
inhibition. Which of the following might a Cdk inhibitor block
in order to block Cdk function? Correct Answers A.cyclin
binding
C.substrate binding
D.ATP binding
Chris and Sam's first child was born with cystic fibrosis, a
recessive disorder caused by mutations in a chromosome 7 gene
called CFTR. Symptoms include frequent lung infections that
result from buildup of thick mucus. Neither parent has cystic
fibrosis, and they were surprised when their first child was
diagnosed with this genetic disorder. What is the percent chance
that their next child will also have cystic fibrosis? Correct
Answers 25%
Collagen is made mainly by Correct Answers fibroblasts
cytoskeleton Correct Answers collection of multiple types of
protein filaments that provide shape, support, movement, and
intercellular transport
Defects in ________ can cause a rare class of premature aging
disorders called progeria Correct Answers nuclear lamin
, Describe collagen fibrils in skin Correct Answers woven into a
wickerwork pattern with alternating layers of different
orientation
Describe the makeup of collagen Correct Answers long, stiff
triple-stranded helical bundle
Desmosomes Correct Answers Anchoring junctions that
prevent cells from being pulled apart
During which division process(es) are the kinetochores of both
sister chromatids captured by microtubules from the same
spindle pole? Correct Answers meiosis I
Epithelial Sheets are polarized and rest on Correct Answers a
Basal Lamina
Epithelial sheets cell types Correct Answers Absorptive and
goblet
Every kind of epithelial cells has a distinct keratin filament
composed of _________ Correct Answers a mixture of keratin
subunits
Fibronectin Correct Answers connects cell surface receptors to
the extracellular collagen fibrils
Fibronectin provides the link between Correct Answers cell
attachment proteins and the ECM
