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05: Cancer: DNA Synthesis, Mitosis, and Meiosis
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Pre-Test
Pre-Test
This activity contains 13 questions.
Cancer is best described as
abnormal cell growth in response to carcinogens such as tobacco smoke.
a malignant tumor.
a mutation in gametes or gamete-producing tissues.
unregulated cell replication.
Which of the following would tend to increase the levels of antioxidants in the body, and thus decrease the risk of cancer?
chewing tobacco
a high-fiber diet
more than two alcoholic drinks a day
a high-fat diet
Which of the following is not an example of asexual reproduction?
pollination in a sunflower, in which pollen (containing sperm) is received by a female flower (containing an egg), resulting in a seed (the embryo)
cloning of vertebrates, in which DNA from the somatic cell of one organism is inserted into the egg (stripped of its own DNA) of another organism, and allowed to develop
spreading growth in a stand of poplar trees, in which new offspring grow from the roots or shoots of a parent tree
binary fission in a photosynthetic cyanobacterium, in which each parent cell divides into two daughter cells
True or false: Each cell that enters the cell cycle contains sister chromatids.
True
False
All of the following are characteristics of telophase except
the reforming of the nuclear envelope.
the start of cytokinesis.
chromosomes in their string-like form.
chromosomes composed of two sister chromatids.
Which of the following statements about cancer is false?
Tumor suppressors can prevent a cell from dividing.
One mutation in a cell's DNA is enough to cause the cell to become cancerous.
Cancer can be caused by the activation of an oncogene.
Cancer can result if the cell cycle becomes unregulated.
True or false: Only individuals with cancer have proto-oncogenes.
False
True
The most common risk factor for nearly every type of cancer is
high-fat diet.
lack of exercise.
smoking.
low-fiber diet.
Laparoscopic procedures are not appropriate when
a physician needs to remove a large tumor from the body.
the physician wants to use a procedure that is less invasive than traditional surgery.
a small piece of tissue must be removed from the body.
a biopsy must be taken from somewhere other than the surface of the body.
Which of the following statements is true about gametes and somatic cells?
The somatic cells of a parent contribute to the genetic makeup of its offspring.
An individual produces gametes that all have a different genetic makeup, while his or her somatic cells all have the same genetic makeup.
Gametes are 2
n
and somatic cells are 1
n
.
Gametes are produced by mitosis.
Which of the following statements about human haploid cells is true?
They are produced within the gonads.
Two haploid cells can fuse to form a haploid organism.
They are generated from other haploid cells.
They are produced by mitosis.
Which of the following does not contain condensed chromosomes that have been duplicated?
a cell immediately preceding anaphase
a cell during metaphase
a cell during prophase
a cell during the G1 phase of interphase
Which of the following events takes place during meiosis II?
Sister chromatids separate from one another.
Crossing over occurs between homologous chromosomes.
All of these events take place during meiosis II.
Homologous chromosome pairs align randomly in the center of the cell.
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