cell division in multicellular organisms is important for _____. a. growth b. repair c. both a and b...
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Cell division in multicellular organisms is important for _____.
A. growth B. repair C. both A and B ___
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Which best describes prokaryotes?
A. unicellular bacteria B. prominent nucleus C. many chloroplasts D. all of the above
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Chromosomes are composed of _____.
A. DNA only B. proteins only C. DNA and proteins ___
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Prokaryotes' DNA is found in the _____.
A. nucleoid B. nucleolus C. nucleus
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Prokaryotes reproduce _____.
A. by binary fission B. sexually C. very slowly
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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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The diploid number of chromosomes in humans is _____.
A. 1 B. 20 C. 46 D. 78
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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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The division of cytoplasm is called _____.
A. replication B. karyokinesis C. binary fission D. cytokinesis ___
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If a cell with 46 chromosomes undergoes mitosis, the daughter cells will have _____ chromosomes.
A. 23 B. 46 C. 92
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In many animals, only _____ are haploid cells.
A. eggs B. sperm C. both A and B ___
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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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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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The _____ most likely provide(s) the material for spindle formation.
A. nucleus B. cytoskeleton C. sister chromatids D. plasma membrane
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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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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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The first phase of nuclear division is called _____.
A. telophase B. metaphase C. prophase D. interphase
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After _____ nuclear division is completed.
A. prophase B. metaphase C. telophase D. interphase
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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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The nuclear envelopes re-form, chromosomes unwind back into chromatin, nucleoli reappear, and the spindledisappears during _____.
A. prophase B. telophase C. metaphase D. anaphase
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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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The sister chromatids separate from each other during _____.
A. prophase B. telophase C. anaphase D. metaphase
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The spindle begins to assemble during _____.
A. prophase B. prometaphase C. metaphase D. anaphase
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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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In plant cells, the vesicles which move along microtubules to the midpoint between the two daughter nuclei fuse to form acell __________.
A. membrane B. plate C. wall
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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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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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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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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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The enzyme that removes a phosphate group from ATP is called _____.
A. cyclin B. kinase C. lipase D. cellulose
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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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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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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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When most cancers occur, _____ is absent or nonfunctional.
A. the p53 gene B. survivin C. angiogenesis
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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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Programmed cell death is known as _____.
A. mitosis B. cytokinesis C. apoptosis ___
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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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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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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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Colon cancer may be prevented by _____.
A. smoking B. high-fiber diets C. alcohol consumption D. hormone therapy
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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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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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