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1 | |
Programmed cell death called ______ is necessary to remove the web of tissue between the toes during embryonic development. |
| | A) | interphase |
| | B) | apoptosis |
| | C) | meiosis |
| | D) | cytokinesis |
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2 | |
Most tissues contain _________ which continually divide. |
| | A) | somatic cells |
| | B) | sex cells |
| | C) | stem cells |
| | D) | haploid cells |
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3 | |
Two opposing processes that keep the number of somatic cells at the proper level are: |
| | A) | mitosis and cytokinesis. |
| | B) | apoptosis and interphase. |
| | C) | cell division and cytokinesis. |
| | D) | cell division and apoptosis |
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4 | |
The longest period of a cell cycle is: |
| | A) | interphase. |
| | B) | mitosis. |
| | C) | cytokinesis. |
| | D) | none of the above. |
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5 | |
Which of the following is NOT an event of interphase? |
| | A) | The cell carries out its normal function. |
| | B) | The cell grows. |
| | C) | The number of organelles is cut in half. |
| | D) | The chromosomes replicate. |
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6 | |
During which part of interphase does DNA replicate? |
| | A) | G1 phase |
| | B) | S phase. |
| | C) | G2 phase. |
| | D) | Prophase. |
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7 | |
Which body cells normally do not complete the G1 stage and therefore do not divide? |
| | A) | Muscle cells |
| | B) | Skin cells |
| | C) | Nerve cells |
| | D) | Both A and C |
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8 | |
DNA in the non-dividing cell is in the form of: |
| | A) | chromosomes |
| | B) | chromatids |
| | C) | chromatin |
| | D) | chromaphore |
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9 | |
Which of the following is the first step in apoptosis? |
| | A) | Plasma membrane blisters. |
| | B) | The cell rounds up losing contact with its neighbors. |
| | C) | The nucleus collapses and DNA fragments. |
| | D) | Cell fragments are engulfed by white blood cells. |
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10 | |
Humans inherit _______ pairs of chromosomes. |
| | A) | 10 |
| | B) | 12 |
| | C) | 23 |
| | D) | 46 |
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11 | |
Mitosis is involved in _______. |
| | A) | growth and repair |
| | B) | oogenesis |
| | C) | spermatogenesis |
| | D) | both B and C |
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12 | |
Nuclear division that gives two daughter cells with the exact number and types of chromosomes is called: |
| | A) | meiosis |
| | B) | cytokinesis |
| | C) | apoptosis |
| | D) | Mitosis |
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13 | |
Duplicated strands of DNA are called ________ and are connected to each other by the __________. |
| | A) | chromatids; centrosomes |
| | B) | chromatin; mitochondria |
| | C) | chromatids; centromere |
| | D) | centromeres; chromosomes |
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14 | |
Which of the following is the correct order of the phases of mitosis? |
| | A) | Prophase, anaphase, telophase, metaphase |
| | B) | Metaphase, telophase, prophase, anaphase |
| | C) | Prophase, metaphase, anaphase, telophase |
| | D) | Telophase, prophase, anaphase, metaphase |
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15 | |
During what stage of mitosis do the chromosomes condense and become visible? |
| | A) | prophase |
| | B) | metaphase |
| | C) | anaphase |
| | D) | telophase |
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16 | |
What stage of mitosis is characterized by a fully formed spindle and the alignment of chromosomes at the equator of the cell? |
| | A) | prophase |
| | B) | metaphase |
| | C) | anaphase |
| | D) | telophase |
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17 | |
Which of the following is NOT an event in prophase? |
| | A) | Chromosomes are visible and attached to the spindle |
| | B) | The nuclear envelop disappears. |
| | C) | The centrosomes (centrioles) move to opposite poles. |
| | D) | Chromosomes line up on the equator. |
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18 | |
Which event and phase is CORRECTLY matched? |
| | A) | Anaphase - chromosomes line up on the equator. |
| | B) | Telophase - cytokinesis occurs. |
| | C) | Metaphase - centromere splits, separating the chromatids. |
| | D) | Prophase - chromosomes lengthen to chromatin |
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19 | |
The separation of sister chromatids occurs in: |
| | A) | anaphase. |
| | B) | metaphase. |
| | C) | prophase. |
| | D) | telophase. |
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20 | |
The main function of the mitotic spindle is to: |
| | A) | split the cell cytoplasm in half. |
| | B) | ensure genetic recombination. |
| | C) | move sister chromatids to opposite poles. |
| | D) | aid in fertilization. |
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21 | |
Members of matching pairs of chromosomes are called: |
| | A) | haploid. |
| | B) | homozygous. |
| | C) | homologues. |
| | D) | gametes. |
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22 | |
The type of cell division that results in the formation of gametes is __________. |
| | A) | mitosis |
| | B) | meiosis |
| | C) | nondisjunction |
| | D) | somatic division |
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23 | |
During meiosis I the __________ pair up in synapsis. |
| | A) | chromatids |
| | B) | centromeres |
| | C) | haploid chromosomes |
| | D) | homologous chromosomes |
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24 | |
The close association of 4 chromatids (the homologues)during the first 2 phases of meiosis I is called: |
| | A) | synapsis. |
| | B) | interkinesis. |
| | C) | reduction. |
| | D) | replication. |
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25 | |
Meiosis is necessary for the production of the gametes to: |
| | A) | give variation. |
| | B) | ensure the proper number of chromosomes after fertilization. |
| | C) | produce gametes with the diploid number of chromsomes. |
| | D) | All of the above are correct. |
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26 | |
_____ between non-sister chromatids during synapsis will give a recombinant DNA having chromosomes with different genes. |
| | A) | Synapsis |
| | B) | Replication |
| | C) | Interkinesis |
| | D) | Crossing-over |
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27 | |
Prophase I differs from Prophase II in that the chromosomes of Prophase I: |
| | A) | appear singly. |
| | B) | appear with their homologue. |
| | C) | line up with their homologue at the equator. |
| | D) | line up singly at the equator. |
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28 | |
In metaphase I of meiosis I, the chromosomes: |
| | A) | separate from their homologue. |
| | B) | line up singly at the equator. |
| | C) | appear random and singly. |
| | D) | line up with their homologue at the equator. |
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29 | |
______ results in two ______ daughter cells; while ____ results in four _____ daughter cells. |
| | A) | Mitosis, haploid; meiosis, diploid |
| | B) | Meiosis, haploid; mitosis, diploid |
| | C) | Mitosis, diploid; meiosis, haploid |
| | D) | Meiosis, diploid; mitosis, haploid |
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30 | |
Which of the following is a result of meiosis? |
| | A) | The cell goes through one nuclear division. |
| | B) | Two identical daughter cells are formed. |
| | C) | All chromosomes line up singly at the equator. |
| | D) | Daughter cells are haploid and not identical. |
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31 | |
Which of the following pairs is NOT correctly matched? |
| | A) | Prophase I of meiosis - homologues appear paired |
| | B) | Metaphase of mitosis - homologues randomly line up at the equator. |
| | C) | Anaphase of mitosis - centromere splits and chromatids move to opposite poles. |
| | D) | Anaphase I of meiosis I - homologues separate and move to opposite poles. |
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32 | |
Genetic recombination occurs through: |
| | A) | joining of egg and sperm in fertilization. |
| | B) | crossing-over of chromatids in prophase I of meiosis. |
| | C) | random alignment of homologues in metaphase I of meiosis. |
| | D) | All of the above are correct. |
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33 | |
The diploid (2n) cells of the testes that begin the meiosis process are called: |
| | A) | spermatids. |
| | B) | secondary spermatocytes. |
| | C) | sperm. |
| | D) | primary spermatocytes. |
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34 | |
Oogenesis differs from spermatogenesis in that oogenesis results in ______. |
| | A) | four diploid cells |
| | B) | four haploid eggs cells |
| | C) | two diploid cells, two haploid cells |
| | D) | one haploid egg cell, three polar bodies |
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35 | |
The process of spermatogenesis normally results in ____ daughter cells. |
| | A) | 2 |
| | B) | 3 |
| | C) | 4 |
| | D) | 8 |
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36 | |
In humans, the haploid number of chromosomes found in the egg and sperm is _________. |
| | A) | 23 pair. |
| | B) | 23. |
| | C) | 46. |
| | D) | 46 pair. |
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