Biology 1201 Exam 3 (Mastering Biology
UPDATED Exam Questions and
CORRECT Answers
Chapter 12: A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How
many chromatids does it contain? - CORRECT ANSWER - 92
Chapter 12: Why is it difficult to observe individual chromosomes with a light microscope
during interphase? - CORRECT ANSWER - The have uncoiled to form long, thin strands.
Chapter 12: Which of the following is true of kinetochores? - CORRECT ANSWER -
They are sites at which microtubules attach to chromosomes.
Chapter 12: Which of the following correctly matches a phase of the cell cycle with its
description? - CORRECT ANSWER - G1 follows cell division
Chapter 12: In some organisms, such as certain fungi and algae, cells undergo the cell cycle
repeatedly without subsequently undergoing cytokinesis. What would result from this? -
CORRECT ANSWER - Large cells containing many nuclei
Chapter 12: Which of the following is found in binary fission but not in mitosis? - CORRECT
ANSWER - Duplicated chromosomes attach the plasma membrane.
Chapter 12: Cytochalasin B is a chemical that disrupts microfilament formation. How would this
interfere with cell division? - CORRECT ANSWER - Cleavage
Chapter 12: Cells will usually divide if they receive the proper signal at a checkpoint in which
phase of the cell cycle? - CORRECT ANSWER - G1
, Chapter 12: Which of the following is true of benign tumors, but not malignant tumors? -
CORRECT ANSWER - They remained confined to the initial site of transformation to
other organs or tissues.
Chapter 12: A group of cells is assayed for DNA content immediately following mitosis and is
found to have an average of 8 picograms of DNA per nucleus. How many picograms would be
found at the end of S and the end of G2? - CORRECT ANSWER - 16; 16
Chapter 12: If the cell whose nuclear material is shown in the figure continues toward
completion of mitosis, which of the following events would occur next? (image of cell in
anaphase) - CORRECT ANSWER - Formation of telophase nuclei
Chapter 12: Which of the following triggers the cell's passage past the G2 checkpoint into
mitosis? - CORRECT ANSWER - MPF
Chapter 12: A plant-derived protein known as colchicine can be used to poison cells by blocking
the formation of the spindle. Which of the following would result if colchicine is added to a
sample of cells in G2? - CORRECT ANSWER - The chromosomes would coil and shorten
by have no spindle to which to attach
Chapter 12: The following information applies to the question below: Several organisms,
primarily protists, have what are called intermediate mitotic organization. What is the most
probable hypothesis about these intermediate forms of cell division? - CORRECT
ANSWER - They show some but not all of the evolutionary steps toward complete mitosis
Chapter 13: Asexual reproduction _________. - CORRECT ANSWER - Produces
offspring genetically identical to the parent.
Chapter 13: What number and types of chromosomes are found in the human somatic cell? -
CORRECT ANSWER - 44 autosomes and 2 sex chromosomes
Chapter 13: For what purpose might a karyotype be prepared? - CORRECT ANSWER -
Prenatal screening: to determine if
UPDATED Exam Questions and
CORRECT Answers
Chapter 12: A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How
many chromatids does it contain? - CORRECT ANSWER - 92
Chapter 12: Why is it difficult to observe individual chromosomes with a light microscope
during interphase? - CORRECT ANSWER - The have uncoiled to form long, thin strands.
Chapter 12: Which of the following is true of kinetochores? - CORRECT ANSWER -
They are sites at which microtubules attach to chromosomes.
Chapter 12: Which of the following correctly matches a phase of the cell cycle with its
description? - CORRECT ANSWER - G1 follows cell division
Chapter 12: In some organisms, such as certain fungi and algae, cells undergo the cell cycle
repeatedly without subsequently undergoing cytokinesis. What would result from this? -
CORRECT ANSWER - Large cells containing many nuclei
Chapter 12: Which of the following is found in binary fission but not in mitosis? - CORRECT
ANSWER - Duplicated chromosomes attach the plasma membrane.
Chapter 12: Cytochalasin B is a chemical that disrupts microfilament formation. How would this
interfere with cell division? - CORRECT ANSWER - Cleavage
Chapter 12: Cells will usually divide if they receive the proper signal at a checkpoint in which
phase of the cell cycle? - CORRECT ANSWER - G1
, Chapter 12: Which of the following is true of benign tumors, but not malignant tumors? -
CORRECT ANSWER - They remained confined to the initial site of transformation to
other organs or tissues.
Chapter 12: A group of cells is assayed for DNA content immediately following mitosis and is
found to have an average of 8 picograms of DNA per nucleus. How many picograms would be
found at the end of S and the end of G2? - CORRECT ANSWER - 16; 16
Chapter 12: If the cell whose nuclear material is shown in the figure continues toward
completion of mitosis, which of the following events would occur next? (image of cell in
anaphase) - CORRECT ANSWER - Formation of telophase nuclei
Chapter 12: Which of the following triggers the cell's passage past the G2 checkpoint into
mitosis? - CORRECT ANSWER - MPF
Chapter 12: A plant-derived protein known as colchicine can be used to poison cells by blocking
the formation of the spindle. Which of the following would result if colchicine is added to a
sample of cells in G2? - CORRECT ANSWER - The chromosomes would coil and shorten
by have no spindle to which to attach
Chapter 12: The following information applies to the question below: Several organisms,
primarily protists, have what are called intermediate mitotic organization. What is the most
probable hypothesis about these intermediate forms of cell division? - CORRECT
ANSWER - They show some but not all of the evolutionary steps toward complete mitosis
Chapter 13: Asexual reproduction _________. - CORRECT ANSWER - Produces
offspring genetically identical to the parent.
Chapter 13: What number and types of chromosomes are found in the human somatic cell? -
CORRECT ANSWER - 44 autosomes and 2 sex chromosomes
Chapter 13: For what purpose might a karyotype be prepared? - CORRECT ANSWER -
Prenatal screening: to determine if
