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Unformatted text preview: Test 2 1. IF there are 20 chromatids in a cell at metaphase, how many chromosomes are there in the daughter cell when mitosis is complete? a. 10 b. 20 c. 40 d. 60 e. None of the above 2. Which of the following is the correct order? a. Prophase, Anaphase, Telophase, Metaphase, Cytokinesis b. Prophase, Metaphase, Telophase, Anaphase, Cytokinesis c. Prophase, Metaphase, Anaphase, Telophase, Cytokinesis d. Cytokinesis, Prophase, Metaphase, Telophase, Anaphase 3. In a population of cells randomly distributed throughout the cell cycle, the length of the S phase was determined by: a. Stopping G1 and measuring the metaphase plates b. Determining the percentage of cells incorporating 3H-THymidine into DNA c. Measuring the time required for the synthesis of the S-protein d. Counting the number of cells at four different time during a 24 hour period e. There is no S phase in a normal cell 4. Proteins that are involved in the regulation of the cell cycle and that show fluctuation in concentration during the cell cycle are called: a. ATPase b. Cyclin dependent kinases c. Cyclin d. Centrioles e. Light cycle proteins 5. What is a chromatid? a. A chromosome in G1 of the cell cycle b. An unseparated replicate chromosome c. A chromosome found outside the nucleus d. The site at which mitotic spindle fibers attach e. A very small chromosome 6. Which of the following statements is false? a. In humans, each of the 22 somatic maternal chromosomes has a homologous paternal chromosome b. In humans, the 23 rd pair of chromosomes, the sex chromosome, determines whether a person is male (XY) or female (XX) c. Single, haploid (N) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2N) fertilized egg d. At sexual maturity, ovaries and testes produce diploid gametes by meiosis 7. Chromosomes first become visible during which phase of mitosis? a. Prometaphase b. Telophase c. Prophase d. Metaphase e. Anaphase 8. Which of the following terms belong with the words synapsis, tetrad and chiasmata? a. Haploid b. Crossing over c. Autosomes d. Prophase I I e. Fertilization 9. In t rying to determine whether DNA or protein was the genetic material, Al Hershey and Martha Chase made use of which of the following facts? a. DNA does no contain S, but proteins do b. DNA contains P, but proteins do not c. DNA contains greater amounts of N than proteins d. A and B e. A, B and C 10.Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. What percent of the nucleotides in this sample will be thymine? a. 12 b. 24 c. 38 d. Cannot be determined from the given data 11.A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. Those cells would have ___________ picograms at the end of S phase and ____________picograms at the end of G2....
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