F09 Bio1010 Exam Microbiology

A it includes signal reception transduction and

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Unformatted text preview: example of A. B. C. D. transcriptional regulation. translational regulation. posttranscriptional regulation. posttranslational regulation. 7 22. A cell contains 92 chromatids in G2 phase. After completion of mitosis each daughter cell nucleus would contain how many chromosomes? A. B. C. D. E. 12 16 23 46 92 23. Control of the eukaryotic cell cycle involves all of the following in A through D, EXCEPT: A. direct control by complexes of cyclins and cyclin ­dependent protein kinases (CDKs). B. internal controls at checkpoints to ensure that the reactions of one stage are complete before the cycle proceeds to the next stage C. external controls recognized by surface receptors that bind signals such as peptide hormones, growth factors, and lead to signal transduction pathways affecting progression of the cell cycle. D. activities of proteins encoded by tumour suppressor genes, such as p53, which can lead to programmed cell death under some circumstances. E. All of the above are involved in control of the cell cycle. 24. Which of the following statements is/are true regarding cellular signalling? A. It includes signal reception, transduction and response processes. B. Signals may be recognized by membrane ­bound proteins or in the cytosol by intracellular receptors. C. It occurs in animal cells, but not in plants nor in fungi. Cell signalling D. All of the above statements in A through C are true of cellular signalling. occurs in all types of organisms. E. Only two (2) of the statements in A through C are true of cellular signalling. 25. The process of transcription refers to the use of information encoded in ____ to make a ____. A. B. C. D. E. RNA; complementary DNA strand DNA; polypeptide DNA; complementary RNA copy a polypeptide; complementary RNA copy DNA; complementary DNA strand 26. If a cell has a diploid number of 32, how many chromosomes are present in the nucleus at the beginning of meiosis? How many chromosomes are present in each resulting cell at the end of meiosis? A. B. C. D. E. beginning: 32; end: 32. beginning: 32; end: 64. beginning: 16; end: 32. beginning: 32; end: 16. beginning 16; end 8. 8 27. Which of the following is FALSE regarding cell division? A. I...
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