Licata Bio 1201 Exam 3 UPDATED
Questions and CORRECT Answers
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many
chromatids does it contain? - CORRECT ANSWER - 92
Why is it difficult to observe individual chromosomes with a light microscope during interphase?
- CORRECT ANSWER - They have uncoiled to form long, thin strands.
Where do microtubules attach to chromosomes? - CORRECT ANSWER - At the
kinetochores
After mitosis and cytokinesis (division), the newly formed daughter cells enter the ___ phase -
CORRECT ANSWER - G1
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
What's found in binary fission but not in mitosis? - CORRECT ANSWER - Duplicated
chromosomes attach to the plasma membrane
Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere
with cell division? - CORRECT ANSWER - Cleavage
Cells will usually divide if they receive the proper signal at a checkpoint in which phase of the
cell cycle? - CORRECT ANSWER - G1
Which of the following is true of benign tumors, but not malignant tumors? - CORRECT
ANSWER - They remain confined
, 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
What triggers the cell's passage past the G2 phase into mitosis? - CORRECT ANSWER -
MPF
A plant-derived protein known as colchicine can be used to poison cells by blocking the
formation of the spindle. What would result if colchicine is added to a sample of cells in G2? -
CORRECT ANSWER - The chromosomes would coil and shorten but have no spindle to
which to attach.
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.
Asexual reproduction produces offspring ____ to the parent - CORRECT ANSWER -
genetically identical
What number and types of chromosomes are found in a human somatic cell? - CORRECT
ANSWER - 44 autosomes and 2 sex chromosomes
For what purpose(s) might a karyotype be prepared? - CORRECT ANSWER - 1) for
prenatal screening, to determine if a fetus has the correct number of chromosomes
2) to determine whether a fetus is male or female
3) to detect the possible presence of chromosomal abnormalities such as deletions, inversions, or
translocations
Questions and CORRECT Answers
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many
chromatids does it contain? - CORRECT ANSWER - 92
Why is it difficult to observe individual chromosomes with a light microscope during interphase?
- CORRECT ANSWER - They have uncoiled to form long, thin strands.
Where do microtubules attach to chromosomes? - CORRECT ANSWER - At the
kinetochores
After mitosis and cytokinesis (division), the newly formed daughter cells enter the ___ phase -
CORRECT ANSWER - G1
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
What's found in binary fission but not in mitosis? - CORRECT ANSWER - Duplicated
chromosomes attach to the plasma membrane
Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere
with cell division? - CORRECT ANSWER - Cleavage
Cells will usually divide if they receive the proper signal at a checkpoint in which phase of the
cell cycle? - CORRECT ANSWER - G1
Which of the following is true of benign tumors, but not malignant tumors? - CORRECT
ANSWER - They remain confined
, 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
What triggers the cell's passage past the G2 phase into mitosis? - CORRECT ANSWER -
MPF
A plant-derived protein known as colchicine can be used to poison cells by blocking the
formation of the spindle. What would result if colchicine is added to a sample of cells in G2? -
CORRECT ANSWER - The chromosomes would coil and shorten but have no spindle to
which to attach.
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.
Asexual reproduction produces offspring ____ to the parent - CORRECT ANSWER -
genetically identical
What number and types of chromosomes are found in a human somatic cell? - CORRECT
ANSWER - 44 autosomes and 2 sex chromosomes
For what purpose(s) might a karyotype be prepared? - CORRECT ANSWER - 1) for
prenatal screening, to determine if a fetus has the correct number of chromosomes
2) to determine whether a fetus is male or female
3) to detect the possible presence of chromosomal abnormalities such as deletions, inversions, or
translocations
