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1 | |
Cell division in unicellular organisms produces two new individuals. |
| | A) | True |
| | B) | False |
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2 | |
Asexual reproduction results in offspring that are genetically different from the parent. |
| | A) | True |
| | B) | False |
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3 | |
Cell division in multicellular organisms is important for _____. |
| | A) | growth |
| | B) | repair |
| | C) | both A and B |
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4 | |
All cells divide continuously throughout the life of a multicellular organism. |
| | A) | True |
| | B) | False |
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5 | |
Which best describes prokaryotes? |
| | A) | unicellular bacteria |
| | B) | prominent nucleus |
| | C) | many chloroplasts |
| | D) | all of the above |
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6 | |
Prokaryotes' chromosomes are identical to those of eukaryotes. |
| | A) | True |
| | B) | False |
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7 | |
Chromosomes are composed of _____. |
| | A) | DNA only |
| | B) | proteins only |
| | C) | DNA and proteins |
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8 | |
Prokaryotes' DNA is found in the _____. |
| | A) | nucleoid |
| | B) | nucleolus |
| | C) | nucleus |
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9 | |
Prokaryotes have a single chromosome. |
| | A) | True |
| | B) | False |
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10 | |
Prokaryotes reproduce _____. |
| | A) | by binary fission |
| | B) | sexually |
| | C) | very slowly |
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11 | |
Some bacteria reproduce in less than 20 minutes. |
| | A) | True |
| | B) | False |
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12 | |
Which process ensures that each newly formed cell gets its own copy of the DNA? |
| | A) | transcription |
| | B) | replication |
| | C) | cytokinesis |
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13 | |
The diploid number of chromosomes in humans is _____. |
| | A) | 1 |
| | B) | 20 |
| | C) | 46 |
| | D) | 78 |
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14 | |
In a eukaryotic cell that is NOT undergoing division, the tangled mass of DNA and its associated proteins is known as _____. |
| | A) | sister chromatids |
| | B) | centromeres |
| | C) | chromatin |
| | D) | histones |
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15 | |
The division of cytoplasm is called _____. |
| | A) | replication |
| | B) | karyokinesis |
| | C) | binary fission |
| | D) | cytokinesis |
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16 | |
If a cell with 46 chromosomes undergoes mitosis, the daughter cells will have _____ chromosomes. |
| | A) | 23 |
| | B) | 46 |
| | C) | 92 |
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17 | |
In many animals, only _____ are haploid cells. |
| | A) | eggs |
| | B) | sperm |
| | C) | both A and B |
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18 | |
Sister chromatids are genetically identical to each other. |
| | A) | True |
| | B) | False |
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19 | |
The region where sister chromatids are attached to one another is called the _____. |
| | A) | centromere |
| | B) | spindle |
| | C) | aster |
| | D) | centriole |
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20 | |
Each species has a characteristic number of chromosomes. |
| | A) | True |
| | B) | False |
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21 | |
During prophase, it is apparent that nuclear division is about to occur because _____. |
| | A) | the chromatin has condensed |
| | B) | the chromosomes are visible structures |
| | C) | both A and B |
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22 | |
The _____ most likely provide(s) the material for spindle formation. |
| | A) | nucleus |
| | B) | cytoskeleton |
| | C) | sister chromatids |
| | D) | plasma membrane |
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23 | |
Which of the following distinguishes an animal cell from a plant cell |
| | A) | centrioles |
| | B) | spindle |
| | C) | asters |
| | D) | both A and C |
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24 | |
Which of the following is NOT associated with prophase? |
| | A) | fragmentation of the nuclear envelope |
| | B) | disappearance of the nucleolus |
| | C) | separation of the sister chromatids |
| | D) | visible chromosomes |
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25 | |
The first phase of nuclear division is called _____. |
| | A) | telophase |
| | B) | metaphase |
| | C) | prophase |
| | D) | interphase |
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26 | |
After _____ nuclear division is completed. |
| | A) | prophase |
| | B) | metaphase |
| | C) | telophase |
| | D) | interphase |
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27 | |
Alignment of the chromosomes at the equator of the spindle is characteristic of _____. |
| | A) | metaphase |
| | B) | prophase |
| | C) | anaphase |
| | D) | telophase |
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28 | |
The nuclear envelopes re-form, chromosomes unwind back into chromatin, nucleoli reappear, and the spindle disappears during _____. |
| | A) | prophase |
| | B) | telophase |
| | C) | metaphase |
| | D) | anaphase |
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29 | |
During __________, the chromosomes attach to the spindle and begin to align at the metaphase plate of the spindle. |
| | A) | telophase |
| | B) | prometaphase |
| | C) | anaphase |
| | D) | prophase |
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30 | |
The sister chromatids separate from each other during _____. |
| | A) | prophase |
| | B) | telophase |
| | C) | anaphase |
| | D) | metaphase |
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31 | |
The spindle begins to assemble during _____. |
| | A) | prophase |
| | B) | prometaphase |
| | C) | metaphase |
| | D) | anaphase |
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32 | |
Cytokinesis in plant cells occurs by the same process as in animal cells. |
| | A) | True |
| | B) | False |
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33 | |
Meristem tissue is found in the __________ of a plant. |
| | A) | root tips |
| | B) | shoot tips |
| | C) | stems |
| | D) | all of the above |
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34 | |
In plant cells, the vesicles which move along microtubules to the midpoint between the two daughter nuclei fuse to form a cell __________. |
| | A) | membrane |
| | B) | plate |
| | C) | wall |
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35 | |
Except for the absence of centrioles and asters, mitosis in plant cells occurs as it does in animal cells. |
| | A) | True |
| | B) | False |
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36 | |
Daughter cells as a result of mitosis have a complete copy of _____. |
| | A) | chromosomes |
| | B) | genes |
| | C) | both A and B |
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37 | |
The separation of the two daughter cells during animal cell division begins when the _____ forms. |
| | A) | cell wall |
| | B) | spindle |
| | C) | cleavage furrow |
| | D) | cell plate |
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38 | |
The period of DNA replication in the cell cycle is called the _____. |
| | A) | M stage |
| | B) | G1 stage |
| | C) | S stage |
| | D) | G2 stage |
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39 | |
Interphase consists of the __________ stages of cellular growth and division. |
| | A) | G1, G2 and M |
| | B) | G1, S and G2 |
| | C) | M, S, and G2 |
| | D) | M, S and G1 |
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40 | |
Cardiac muscle cells do not undergo mitosis so damage done by a heart attack cannot be repaired. |
| | A) | True |
| | B) | False |
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41 | |
Movement of a cell through the various stages of the cell cycle appears to be controlled by _____. |
| | A) | kinase |
| | B) | growth factors |
| | C) | cyclins |
| | D) | all of the above |
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42 | |
The cell grows in size and the number of cellular organelles increases during the _____ stage of the cell cycle. |
| | A) | G1 |
| | B) | S |
| | C) | G2 |
| | D) | M |
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43 | |
The length of the different stages of the cell cycle _____. |
| | A) | varies among species |
| | B) | varies among different cells in the same individual |
| | C) | both A and B |
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44 | |
Cells move from the G1 phase to the S phase when S-kinase binds to S-cyclin. |
| | A) | True |
| | B) | False |
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45 | |
When most cancers occur, _____ is absent or nonfunctional. |
| | A) | the p53 gene |
| | B) | survivin |
| | C) | angiogenesis |
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46 | |
Which of the following is/are (a) mutagenic carcinogen(s)? |
| | A) | radiation |
| | B) | tobacco smoke |
| | C) | viruses |
| | D) | all of the above |
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47 | |
Many different types of human cancers contain no or a faulty p53 gene. |
| | A) | True |
| | B) | False |
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48 | |
Programmed cell death is known as _____. |
| | A) | mitosis |
| | B) | cytokinesis |
| | C) | apoptosis |
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49 | |
The p53 protein _____. |
| | A) | inhibits repair enzymes |
| | B) | stops the cell cycle during repair |
| | C) | inhibits apoptosis |
| | D) | all of the above |
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50 | |
Which of the following characteristics is displayed by cancer cells? |
| | A) | contact inhibition |
| | B) | normal looking nuclei |
| | C) | specialization |
| | D) | chromosome mutations |
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51 | |
A disorganized, generally encapsulated mass that does not invade adjacent tissue is known as a _____. |
| | A) | neoplasia |
| | B) | benign tumor |
| | C) | anaplasia |
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52 | |
Colon cancer may be prevented by _____. |
| | A) | smoking |
| | B) | high-fiber diets |
| | C) | alcohol consumption |
| | D) | hormone therapy |
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53 | |
Almost all skin cancers are related to sun exposure. |
| | A) | True |
| | B) | False |
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54 | |
Cancer cells can travel through the circulatory or lymphatic systems and start tumors throughout the body. |
| | A) | True |
| | B) | False |
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55 | |
New methods of cancer treatment prevent _____ which cuts off the supply of nutrients and oxygen to the tumor. |
| | A) | metastasis |
| | B) | angiogenesis |
| | C) | differentiation |
| | D) | anaplasia |
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56 | |
About 87% of all lung cancer cases are related to _____. |
| | A) | radon exposure |
| | B) | asbestos exposure |
| | C) | smoking |
| | D) | alcohol consumption |
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57 | |
Fresh fruits and vegetables in the cabbage family have been shown to be especially protective against cancer development. |
| | A) | True |
| | B) | False |
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