Questão 1
Questão
When cells are grown in a laboratory, which of the following is a factor that can stop normal cells from dividing?
Responda
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a cut in the skin
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contact with other cells
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growth factors
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injection of cyclin
Questão 2
Questão
In eukaryotic cells, the timing of the cell cycle is regulated by
Responda
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cyclins
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centrioles
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spindle fibers
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the nuclear envelope
Questão 3
Questão
Cyclins are a family of closely related proteins that
Responda
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produce p53.
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cause cancer.
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work to heal wounds.
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regulate the cell cycle.
Questão 4
Questão
Which of the following are external regulators of the cell cycle?
Responda
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cancer cells
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cyclins
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growth factors
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mitotic spindles
Questão 5
Questão
Cancer is a disorder in which some cells have lost the ability to control their
Responda
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surface area
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size
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spindle fibers
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growth rate
Questão 6
Questão
Cancer cells form masses of cells called
Responda
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tumors
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cyclins
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growth factors
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p53
Questão 7
Questão
A cell with a defective p53 gene is likely to
Responda
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generate hormones that combat tumors.
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stop responding to growth regulators.
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produce cells without a defective p53 gene.
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stop dividing to produce daughter cells.
Questão 8
Questão
During early development, all cells in the embryo of a multicellular organism are identical. Later on in development, the cells will become specialized through a process called
Responda
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differentiation
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cytokinesis
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apoptosis
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interphase
Questão 9
Questão
Why are stem cells important?
Responda
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They have the potential to undergo cell division.
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They have specialized DNA.
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They have the potential to develop into other cell types.
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They are incapable of becoming cancer cells.
Questão 10
Questão
Which of the following is a possible future benefit of stem cell research?
Responda
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increasing a person’s intelligence quotient
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generating embryos from nonliving tissue
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developing a vaccine for cancer
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reversing damage from a heart attack
Questão 11
Questão
Nerve cells are cells that have not yet undergone differentiation.
Questão 12
Questão
Stem cells taken from embryos are totipotent.
Questão 13
Questão
During normal development, the cells between toes and fingers die by [blank_start]____________________[blank_end], a process of programmed cell death.
Questão 14
Questão
Harvesting [blank_start]____________________[blank_end] stem cells from a willing donor is not as controversial as harvesting techniques that involve the destruction of an embryo.
Questão 15
Questão
Which diagram represents cancer?
Questão 16
Questão
Which diagram has a defected p53 gene?
Questão 17
Questão
How can the cancer cells be treated?