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Key Concepts Quiz

This activity contains 26 questions.

Question 1
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Asexual and sexual reproduction differ in that sexual reproduction _____.
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Question 2
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Consider the process by which bacterial populations grow. What process performs a similar function in humans?
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Question 3
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During binary fission, the replicated bacterial chromosome attaches to the plasma membrane by specialized anchor proteins. What is the purpose of this attachment between chromosome and membrane?
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Question 4
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Within one chromosome, what is the relationship between the sequence of bases in DNA of one sister chromatid compared to the other?
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Question 5
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Which of the following statements correctly describes the timing of DNA synthesis?
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Question 6
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What would be the immediate consequence of destroying a cell's centrosomes?
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Question 7
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During mitosis, the chromosomes move because _____.
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Question 8
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A cell is treated with a drug that prevents the formation of intracellular (within the cell) vesicles. Which of the following processes would be blocked?
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Question 9
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In the laboratory, cancer cells fail to show density-dependent inhibition of growth in cell culture. What is one explanation that could account for this?
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Question 10
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When examining cells in the laboratory, you notice that a particular cell has half as much DNA as the surrounding cells. It appears that this cell's cell cycle halted at checkpoint _____.
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Question 11
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A benign and a malignant tumor differ in that _____.
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Question 12
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When forming buds, hydras _____.
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Question 13
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In many organisms, including humans, chromosomes are found in homologous pairs. Homologous chromosomes _____.
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Question 14
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Baker's yeast is an organism with 32 chromosomes that can perform asexual or sexual reproduction and exist as both a diploid and haploid cell. After meiosis, how many chromosomes will be present in each cell?
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Question 15
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The M phase of mitosis and M phase of meiosis both occur after interphase. However, the two processes differ in the arrangement and behavior of their chromosomes. How?
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Question 16
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At the conclusion of meiosis I, the daughter cells are _____.
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Question 17
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In meiosis II, _____.
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Question 18
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If we assume that crossing over does not occur, how many different combinations of chromosomes are possible in a zygote derived from diploid parents who each have three pairs of chromosomes?
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Question 19
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Inbreeding has a number of interesting effects. For one, highly inbred strains (varieties) may carry identical forms of every gene. Mice have 40 chromosomes in their diploid (2n) set. How many genetically distinct kinds of gametes (gametes with different genetic characteristics) could be produced through meiosis in an inbred strain where there are identical forms of every gene?
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Question 20
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During meiosis I, homologous chromosomes form a tetrad. What does this accomplish?
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Question 21
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In a cell with eight chromosomes, one chiasma develops during meiosis I in only one particular pair of homologs. How many recombinant chromosomes will there be at the completion of meiosis II?
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Question 22
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Scientists commonly choose white blood cells that are going through mitosis to prepare karyotypes. Why?
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Question 23
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Although in humans there are 22 pairs of autosomal chromosomes, only three different chromosomal trisomies are commonly seen in newborns. Of the remaining 19 autosomes, many trisomies have not been seen in newborns. Why not?
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Question 24
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In theory, when a nondisjunction for chromosome 18 occurs during meiosis I, four gametes can be produced. If these gametes are fertilized with unaffected gametes from the second parent, what observations would you make concerning the resulting embryos?
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Question 25
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Trisomy for most autosomes is fatal, yet trisomy or even tetrasomy (four copies) of the X chromosome is not. What is the explanation for this difference?
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Question 26
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You suspect that a serious developmental disorder is due to a chromosome abnormality and prepare a karyotype from an affected individual. In analyzing the karyotype, how could you distinguish trisomy from a chromosome structural defect such as a duplication?
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