PCB 3023 UCF Exam 4 | UPDATED Questions with 100% Verified
Answers
Question:
Programmed cell death occurs
A. by means of an intracellular suicide program
B. rarely and selectively only during animal development
C. only in unhealthy or abnormal cells
D. only during embryonic development
Answer:
A. by means of an intracellular suicide program
Question:
What kind of apoptosis regulator is Bcl-2?
A. propoptotic
B. antiapoptotic
C. initiator caspase
D. effector caspase
Answer:
B. antiapoptotic
Question:
Which statement about apoptosis is true?
A. Cells that constitutively express Bel2 will be more prone to
undergo apoptosis.
B. The prodomain of procaspases contains the catalytic
activity necessary for procaspase activation.
C. Bax and Bak promote apoptosis by binding to procaspases
in the apoptosome.
D. Apoptosis is promoted by the release of cytochrome c into
the cytosol from mitochondria.
Answer:
D. Apoptosis is promoted by the release of cytochrome c into the cytosol from
mitochondria.
,Question:
An adult hematopoietic stem cell found in the bone
marrow
A. will occasionally produce epidermal cells when necessary
B. can produce only red blood cells
C. can undergo self-renewing divisions for the lifetime of a
healthy animal
D. will express all the same transcription factors as those
found in an unfertilized egg
Answer:
C. can undergo self-renewing divisions for the lifetime of a healthy animal
Question:
What affect would an overactive Wnt signaling pathway have
on the intestinal epithelium?
A. loss of stem cells for renewal of gut lining
B. formation of polyps by promoting inappropriate
proliferation of gut stem cells
C. formation of too many absorptive cells
D. formation of too few secretory cells
Answer:
B. formation of polyps by promoting inappropriate proliferation of gut stem cells
Question:
Would you consider formation of the outer layer of skin cells
to be due to programmed cell death?
A. yes
B. no
Answer:
A. yes
Question:
,How do reproductive cloning and therapeutic cloning differ?
A. The DNA in the nucleus of cells produced for therapeutic
cloning is genetically identical to the donor genome, whereas
in cells produced for reproductive cloning it is not.
B. Reproductive cloning requires a supply of fertilized donor
egg cells, whereas therapeutic cloning requires unfertilized
egg cells.
C. Embryos are placed into foster mothers during
reproductive cloning but not during therapeutic cloning.
D. Therapeutic cloning requires nuclear transplantation,
whereas reproductive cloning does not.
Answer:
A. The DNA in the nucleus of cells produced for therapeutic cloning is genetically
identical to the donor genome, whereas in cells produced for reproductive cloning it is
not
C. Embryos are placed into foster mothers during reproductive cloning but not during
therapeutic cloning.
Question:
Which statement about the cell cycle is false?
A. Once a cell decides to enter the cell cycle, the time from
start to finish is the same in all eukaryotic cells.
B. An unfavorable environment can cause cells to arrest in G1.
C. A cell has more DNA during G2 than it did in G1.
D. The cleavage divisions that occur in an early embryo have a
modified cell cycle with essentially no G1 or G2 phases.
Answer:
D. The cleavage divisions that occur in an early embryo have a modified cell cycle with
essentially no G1 or G2 phases.
Question:
One approach to killing cancer cells is to induce apoptosis.
Which of the following are reasonable approaches that
researchers can take to induce apoptosis in cancer cells?
, A.activating the Bax protein
B.inhibiting the Bcl2 protein
C.inhibiting the p53 protein
D.inhibiting the G1-cyclin-dependent kinase protein
Answer:
A.activating the Bax protein
B.inhibiting the Bcl2 protein
Question:
The size of a human organ often depends on which factor?
Choose one or more:
A) the death of cells during its development
B) the proliferation of cells during its development
C) the number of chromosomes in the cells of the organ
Answer:
A) the death of cells during its development
B) the proliferation of cells during its development
Question:
Which of the following statements is true?Choose one:
A. Many cells die by apoptosis in many normal, adult human
tissues.
B. Many cells die by necrosis during normal animal
development.
C. Many cells die by necrosis in many normal, adult human
tissues.
Answer:
A. Many cells die by apoptosis in many normal, adult human tissues.
Question:
Determine whether the following statement is true or false:
Apoptosis depends on a tightly regulated proteolytic
cascade.
Answers
Question:
Programmed cell death occurs
A. by means of an intracellular suicide program
B. rarely and selectively only during animal development
C. only in unhealthy or abnormal cells
D. only during embryonic development
Answer:
A. by means of an intracellular suicide program
Question:
What kind of apoptosis regulator is Bcl-2?
A. propoptotic
B. antiapoptotic
C. initiator caspase
D. effector caspase
Answer:
B. antiapoptotic
Question:
Which statement about apoptosis is true?
A. Cells that constitutively express Bel2 will be more prone to
undergo apoptosis.
B. The prodomain of procaspases contains the catalytic
activity necessary for procaspase activation.
C. Bax and Bak promote apoptosis by binding to procaspases
in the apoptosome.
D. Apoptosis is promoted by the release of cytochrome c into
the cytosol from mitochondria.
Answer:
D. Apoptosis is promoted by the release of cytochrome c into the cytosol from
mitochondria.
,Question:
An adult hematopoietic stem cell found in the bone
marrow
A. will occasionally produce epidermal cells when necessary
B. can produce only red blood cells
C. can undergo self-renewing divisions for the lifetime of a
healthy animal
D. will express all the same transcription factors as those
found in an unfertilized egg
Answer:
C. can undergo self-renewing divisions for the lifetime of a healthy animal
Question:
What affect would an overactive Wnt signaling pathway have
on the intestinal epithelium?
A. loss of stem cells for renewal of gut lining
B. formation of polyps by promoting inappropriate
proliferation of gut stem cells
C. formation of too many absorptive cells
D. formation of too few secretory cells
Answer:
B. formation of polyps by promoting inappropriate proliferation of gut stem cells
Question:
Would you consider formation of the outer layer of skin cells
to be due to programmed cell death?
A. yes
B. no
Answer:
A. yes
Question:
,How do reproductive cloning and therapeutic cloning differ?
A. The DNA in the nucleus of cells produced for therapeutic
cloning is genetically identical to the donor genome, whereas
in cells produced for reproductive cloning it is not.
B. Reproductive cloning requires a supply of fertilized donor
egg cells, whereas therapeutic cloning requires unfertilized
egg cells.
C. Embryos are placed into foster mothers during
reproductive cloning but not during therapeutic cloning.
D. Therapeutic cloning requires nuclear transplantation,
whereas reproductive cloning does not.
Answer:
A. The DNA in the nucleus of cells produced for therapeutic cloning is genetically
identical to the donor genome, whereas in cells produced for reproductive cloning it is
not
C. Embryos are placed into foster mothers during reproductive cloning but not during
therapeutic cloning.
Question:
Which statement about the cell cycle is false?
A. Once a cell decides to enter the cell cycle, the time from
start to finish is the same in all eukaryotic cells.
B. An unfavorable environment can cause cells to arrest in G1.
C. A cell has more DNA during G2 than it did in G1.
D. The cleavage divisions that occur in an early embryo have a
modified cell cycle with essentially no G1 or G2 phases.
Answer:
D. The cleavage divisions that occur in an early embryo have a modified cell cycle with
essentially no G1 or G2 phases.
Question:
One approach to killing cancer cells is to induce apoptosis.
Which of the following are reasonable approaches that
researchers can take to induce apoptosis in cancer cells?
, A.activating the Bax protein
B.inhibiting the Bcl2 protein
C.inhibiting the p53 protein
D.inhibiting the G1-cyclin-dependent kinase protein
Answer:
A.activating the Bax protein
B.inhibiting the Bcl2 protein
Question:
The size of a human organ often depends on which factor?
Choose one or more:
A) the death of cells during its development
B) the proliferation of cells during its development
C) the number of chromosomes in the cells of the organ
Answer:
A) the death of cells during its development
B) the proliferation of cells during its development
Question:
Which of the following statements is true?Choose one:
A. Many cells die by apoptosis in many normal, adult human
tissues.
B. Many cells die by necrosis during normal animal
development.
C. Many cells die by necrosis in many normal, adult human
tissues.
Answer:
A. Many cells die by apoptosis in many normal, adult human tissues.
Question:
Determine whether the following statement is true or false:
Apoptosis depends on a tightly regulated proteolytic
cascade.
