Biology 1010 – Flashcards

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question
The enzyme DNA polymerase catalyzes the DNA replication process during which of the following phases of the mitotic cell cycle?
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Synthesis (S phase)
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Chromosomes on which recombination takes place:
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Both a) and b) are correct. a)have a mixtures of maternal and paternal chromosomes b)are created during meiosis
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According to the graph above, what is the probability that a baby born to a 35-year-old woman will have Down syndrome?
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3 out of 1,000
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1. two daughter nuclei are formed (telophase) 2. centromeres separate (early anaphase) 3. cytoplasm is divided (cytokinesis) 4. chromosomes move toward opposite poles (anaphase) 5. chromosomes line up in single file (metaphase)
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5, 2, 4, 1, 3
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Cancer cells are different from other cells in that they have lost their "contact inhibition." "Contact inhibition" means:
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most cells stop dividing when they bump up against other cells or collections of cells
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The purpose of mitosis is to enable existing cells
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to generate new, genetically identical cells.
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In most bacteria, the DNA:
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is carried in a single circular chromosome.
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During which phase of the cell cycle do the chromosomes align in one plane at the center of the cell?
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Metaphase
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Bacteria divide by a type of ______________________ called ____________________.
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asexual reproduction ; binary fission
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Which stage of the mitotic cell cycle is illustrated above?
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metaphase
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In asexual reproduction, daughter cells inherit their DNA from ____________________.
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a single parent
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Mitosis produces TWO (2) daughter cells that:
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are genetically identical to each other and to the original parent.
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Which of the following is TRUE about sexual reproduction?
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Sexual reproduction produces a greater variation in offspring than asexual reproduction.
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The stage of the cell cycle in which the chromosomes are aligned in single file between
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metaphase.
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Nondisjunction:
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is the unequal division of the genetic material during cell division.
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Which of the following are features that distinguish cancer cells from normal cells?
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Both b) and d) are correct. b) Normal cells have contact inhibition; cancer cells have no contact inhibition. d) Normal cells can divide a finite number of times; cancer cells can divide indefinitely.
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Sister chromatids line up at the center of the cell at which of the following phases of the mitotic cell cycle?
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metaphase
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Beginning with interphase, put the following stages of the mitotic cell cycle into the correct sequence.
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Gap-1 S-phase Gap-2 karyokinesis cytokinesis
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Eukaryotic cells can divide by:
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both mitosis and meiosis.
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Chemotherapy is one common treatment for cancer. Which of the following are aspects of chemotherapy?
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Drugs that interfere with cell division are administered to the patient. Chemotherapy drugs circulate throughout the entire body. Chemotherapy drugs disrupt normal systems that rely on the rapid and constant production of new cells.
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Animal cells have "counters" that keep track of how many times a cell has divided. These counters are called:
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telomeres.
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Which of the following places the events of mitosis into the correct order?
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chromosomes wind up, chromosomes line up in the middle of the cell, sister chromatids separate, cytokinesis occurs
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Which of the following happens in cytokenesis?
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the cytoplasm is divided
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Radiation therapy for cancer works because a cell's DNA is exposed during mitosis and most vulnerable to damage from radiation. Because cancer cells are uncontrollably undergoing mitosis, they die when exposed to the treatment. The common side effects of radiation treatment are hair loss and vomiting. What does this imply?
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Both stomach and skin cells are constantly being replaced.
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Down syndrome and other disorders where there are extra or missing copies of a chromosomes are the consequence of:
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nondisjunction.
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Which of the following correctly orders the events of the eukaryotic cell cycle? You selected: Gap 1, DNA synthesis, Gap 2, mitosis, cytokinesis
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Gap 1, DNA synthesis, Gap 2, mitosis, cytokinesis
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Which of the following are the three stages of interphase (in the mitotoc cell cycle)?
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Gap-1, S-phase and Gap-2
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Which stage of the mitotic cell cycle is illustrated above?
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anaphase
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The chromosomes of bacteria are:
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circular.
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How does crossing over introduce variation in meiosis?
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It positions alleles next to each other that previously were not together.
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Cancer cells differ from normal cells in two important aspects:
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indefinite cell division and the loss of contact inhibition.
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Radiation therapy for cancer is designed to destroy cells that are undergoing rapid mitosis, like cancer cells. How does this therapy work?
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During mitosis, a cell's DNA is exposed and most vulnerable to damage from radiation.
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The stage of the cell cycle where the chromosomes are aligned along the equator in single file is called:
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metaphase
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A karyotype
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Both a) and c) are correct. a)can be used to diagnose Down syndrome in humans. c)can be used to determine the sex of a fetus in humans.
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During which stage of the mitotic cell cycle would you see a single file arrangement of chromosomes?
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metaphase
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n multicellular organisms, the cells that undergo mitotic cellular division but not meiotic cell division are called
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somatic cells.
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Trisomy 21 is a consequence of the unequal distribution of chromosomes during meiosis._______________________,
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nondisjunction
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The division of the cytoplasm during cell division is referred to as:
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cytokinesis.
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In multicellular organisms, cells that undergo mitotic division but not meiotic division are called _____ cells.
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somatic
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Which of the following explains the fact that the Y chromosome carries nonessential information?
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Women don't have a Y chromosome and are not genetically disadvantaged.
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Within interphase, which of the stages is defined by the active replication of the cell's genetic material?
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the DNA synthesis phase
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Which of the following places the events of mitosis into the correct order?
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chromosomes wind up, chromosomes line up in the middle of the cell, sister chromatids separate, cytokinesis occurs
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The DNA in linear eukaryotic chromosomes is wrapped around proteins called _____________, which keep the DNA from getting tangled and enable an orderly, tight, and efficient packing of the DNA inside the cell.
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histones
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During which phase of the cell cycle do the chromosomes align in one plane at the center of the cell?
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Metaphase
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The chromosomes of bacteria are:
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circular
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Which of the following is NOT a characteristic of Turner Syndrome?
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taller than average stature
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Beginning with interphase, put the following stages of the mitotic cell cycle into the correct sequence by numbering them from 1-6
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Interphase (Gap-1) Prophase Metaphase Anaphase Telophase Cytokenesis
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Which of the following statements about the cell cycle is NOT true?
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The Gap 2 phase immediately follows the Gap 1 phase.
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During which phase of the cell cycle is DNA replicated?
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Interphase
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What is the definition of "female"
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producing the larger, less motile gamete
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Within interphase, which of the stages is defined by the active replication of the cell's genetic material?
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the DNA synthesis phase
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In some species, sex is determined by environmental, rather than genetic, factors. This is true of:
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turtles
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Which stage of the mitotic cell cycle is illustrated above?
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prophase
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Aneuploidy (an abnormal number of chromosomes) occurs due to one particular erroneous meiotic event called:
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nondisjunction (chromosomes don't separate)
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Which of the following human sex chromosome genotypes is not possible?
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YY
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Which of the following explains the fact that the Y chromosome carries nonessential information?
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Women don't have a Y chromosome and are not genetically disadvantaged.
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Which of the following is the best way to distinguish male from female
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Males produce motile gametes.
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Anaphase of mitosis occurs when:
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the chromatids begin to separate from the metaphase plate.
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Which of the following are features that distinguish cancer cells from normal cells?
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Both b) and d) are correct.
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Which of the following happens in cytokenesis?
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The cytoplasm is divided
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According to the graph above, what is the probability that a baby born to a 35-year-old woman will have Down syndrome?
answer
3 out of 1,000
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1. two daughter nuclei are formed (telophase) 2. centromeres separate (early anaphase) 3. cytoplasm is divided (cytokinesis) 4. chromosomes move toward opposite poles (anaphase) 5. chromosomes line up in single file (metaphase) Which of the following is the correct order of the events in the mitotic cell cylce listed above?
answer
5, 2, 4, 1, 3
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Healthy individuals may have just one sex chromosome, as long as it is an X chromosome. Why can't a person survive with a Y chromosome and no X chromosome?
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The X chromosome has a full complement of genetic material, much of which is vital to life; the Y chromosome is missing the vast majority of these genes.
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Which of the following are the three stages of interphase (in the mitotoc cell cycle)?
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Gap-1, S-phase and Gap-2
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Somatic cells can include:
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Both a) and b) are correct.
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Within interphase, which of the stages is defined by the active replication of the cell's genetic material?
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the DNA synthesis phase
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Down syndrome results from which of the following chromosomal abnormalities?
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all or part of a third copy of chromosome 21
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