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The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called Asexual reproduction Sexual reproduction Regeneration Spontaneous generation
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Correct answer: A
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2. Prior to mitosis, each chromosome of a eukaryotic cell consists of a pair of identical structures called Chromatin Sister chromosomes Nucleoli Sister chromatids
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Correct answer: D
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In which do eukaryotic cells spend most of their cell cycle?
Interphase Prophase Metaphase Telophase
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Correct answer: A
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4. Which of the following occurs during interphase?
A reduction in the size of the nuclear membrane Cytokinesis Cell growth ad duplication of the chromosomes Separation of newly formed DNA to opposite ends of the cell.
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Correct answer: C
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5. The genetic material is duplicated during
The mitotic phase G1 S phase G2
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Correct answer: C
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6. The process by which the cytoplasm of a eukaryotic cell divides to produce two cells is called
Mitosis Cytokinesis Binary fission Telophase
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Correct answer: B
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7. The phase of mitosis during which the mitotic spindle begins to form
Interphase Prophase Metaphase Anaphase
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Correct answer: B
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8. During which phase of mitosis do the chromosomes line up on a plane equidistant from the two spindle poles? Prophase Metaphase Anaphase Telophase
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Correct answer: B
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9. At the start of mitotic anaphase,
The centromeres of each chromosome come apart The chromatid DNA replicates Nuclear envelopes begin to form around the chromosomes Equivalent and complete collections of chromosomes have reached the two poles
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Correct answer: A
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10. During which phase of mitosis does the nuclear envelope re-form?
Anaphase Metaphase Prophase Telophase
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Correct answer: D
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11. Which of the following is a feature of plant cell division that distinguishes it from animal cell division? Formation of a cell plate Formation of a cleavage furrow Lack of cytokinesis Production of four new cells per mitotic division
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Correct answer: A
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12. Mature human nerve cells and muscle cells
Become cancerous more easily than other cell types Continue to divide throughout their lifetime Are permanently in a state of non-division Cease dividing after a pre-determined number of cell generations
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Correct answer: C
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13. Which of the following statements regarding mitosis and meiosis is FALSE?
Meiosis only occurs in the ovaries and testes All sexual life cycles involve an alternation of diploid and haploid stages Mitosis produces daughter cells with half the number of chromosomes as the parent cell A normal human zygote has 46 chromosomes
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Correct answer: C
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13. Which of the following statements is FALSE?
Gametes are haploid cells Two haploid cells fuse during fertilization An X chromosome is an autosome A zygote is a fertilized egg
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Correct answer: C
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14. During which stage or meiosis do synapsis and crossing over occur?
Interphase I Prophase I Prophase II Metaphase I
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Correct answer: B
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15. Which of the following statements correctly describes the behavior of a tetrad during anaphase I of meiosis? It goes intact to one pole of the dividing cell It splits into two pairs of sister chromatids, and one pair goes to each pole of the dividing cell It splits into two pairs of homologous, non-sister chromatids, and one pair goes to each pole of the dividing cell It splits into four chromosomes, which distribute in random pairs to two poles of the dividing cell
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Correct answer: B
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16. Which of the following statements regarding the differences between mitosis and meiosis is FALSE? In meiosis four daughter cells are produced, whereas in mitosis two daughter cells are produced. Cells produced by mitosis are diploid, whereas cells produced by meiosis are haploid In mitosis, cytokinesis occurs once, whereas in meiosis cytokinesis occurs twice Crossing over is a phenomenon that creates genetic diversity during meiosis.
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Correct answer: D
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17. Independent orientation of chromosomes at Metaphase 1 results in an increase in the number of
Gametes Homologous chromosomes Possible combination of characteristics Sex chromosomes
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Correct answer: C
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18. At a chiasma, two ______ are attached to each other.
Homologous or non-sister chromatids Homologous or sister chromatids Non-homologous chromosomes Daughter cells
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Correct answer: A
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20. Without crossing over, Cells could not complete meiosis Meiosis could not produce haploid gametes Only a small number of unique gametes could be produced by a single individual Genetic recombination could not occur
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Correct answer: D
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21. Karyotyping Shows chromosomes as they appear in metaphase of meiosis II Can reveal alterations in chromosome number Examines points of crossing over Reveals the presence of cancerous genes
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Correct answer: B
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22. Non-disjunction occurs when
A portion of a chromosome breaks off and is lost Two chromosomes fuse into one Members of a chromosome pair fail to separate An entire pair of chromosomes is lost during meiosis 1
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Correct answer: C
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23. Which of the following statements regarding meiosis and mitosis is FALSE?
Mitosis provides cells for growth and tissue repair Meiosis provides cells for asexual reproduction In mitosis, the chromosomes replicate only once in the preceding interphase All the events unique to meiosis occur during meiosis 1
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Correct answer: B
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24. Both mitosis and meiosis are preceded by
Prometaphase Interphase Prophase Telophase
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Correct answer: B
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25. Which of the following statements regarding Down syndrome is FALSE?
Trisomy 21 is the cause of Down syndrome Down syndrome is the most common serious birth defect in the United States People with Down syndrome usually have a shorter life span than normal. Down syndrome is least likely to be seen in the infants of mothers over the age of 40
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Correct answer: D
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