2. Chromosomes have not formed in this phase of the cell cycle. a. Prophase b. Telophase c. Metaphase d. Interphase e. Anaphase
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1 Pierce College Putman/Biol 241 UNIT 03 PRACTICE EXAM (PART 2): CELL CYCLE 1. About 70-90% of the life of a cell is spent in this phase: b. Metaphase 2. Chromosomes have not formed in this phase of the cell cycle. b. Telophase c. Metaphase d. Interphase 3. In this phase of the cell cycle, 92 chromosomes form: b. Interphase c. Telophase d. Metaphase 4. In this phase or stage, DNA replication occurs: b. G1 of interphase c. S of interphase d. G0 of prophase 5. In this phase of the cell cycle, kinetochores divide: a. Anaphase b. Prophase 6. In this phase of the cell cycle, cytokinesis occurs: a. Anaphase b. Prophase Putman/Pierce College Biol px2/ /Page 1
2 7. In this phase of the cell cycle, chromosomes line up on an imaginary equator: a. Anaphase b. Prophase 8. In this phase of the cell cycle, the nucleoli atrophy: a. Interphase b. Early prophase c. Late prophase 9. In this phase of the cell cycle, the centrosomes are located at the poles: b. Metaphase c. Anaphase e. b, c and d 10. In this phase of the cell cycle, the cell decides whether to divide, become quiescent or differentiate: 11. In this phase of the cell cycle, the centrosomes divide: e. Late prophase 12. In this stage of the cell cycle, the nuclear envelope atrophies and the spindles connect to the kinetochores: a. Early prophase b. Late prophase c. Metaphase d. Anaphase 13. In this stage of the cell cycle, polypeptide synthesis can occur: a. Late prophase b. Metaphase Putman/Pierce College Biol px2/ /Page 2
3 14. In this phase of the cell cycle, the centrioles within the centrosomes replicate: e. Late prophase 15. In this phase of the cell cycle, the cell grows until the surface area to volume ratio initiates mitosis: e. Late prophase 16. In this phase of the cell cycle, the nucleolus is apparent, chromosomes have not formed, and the nuclear envelope is still seen: a. Early prophase b. Interphase c. Late prophase d. Metaphase e. Telophase 17. What is the major enzyme that is responsible for DNA replication? a. RNA polymerase b. DNA polymerase c. Ligase d. Helicase 18. What is DNA replication? a. When the DNA molecule splits and each strand attracts matching DNA nucleotides, forming two completely new DNA molecules. b. When the DNA molecule splits and each strand attracts matching DNA nucleotides, forming two DNA molecules, half of which are from the old DNA molecule, the other half being completely new. c. When the DNA molecule splits and attracts matching DNA nucleotides, forming two DNA molecules, one completely new DNA molecule, the original DNA molecule zipping back up. 19. Division of the nucleus: a. Cytokinesis b. Karyokinesis Putman/Pierce College Biol px2/ /Page 3
4 20. Product of mitosis in humans: a. Two cells with equal cytoplasm, each with 46 chromosomes b. Two cells with unequal cytoplasm, each with 46 chromosomes c. Two cells with equal cytoplasm, each with 23 chromosomes d. Four cells with equal cytoplasm, each with 23 chromosomes 21. Function of mitosis: a. Growth b. Tissue repair c. Production of gametes (eggs and sperm) d. a and b e. a, b and c 22. Production of mrna occurs during: a. Mitosis b. Interphase c. Transcription d. Translation e. b and c 23. Polypeptide produced: a. Transcription b. Translation c. Replication 24. Where does transcription occur? a. Cytoplasm b. Nucleoplasm c. Inside rough ER 25. Where does translation occur? a. Cytoplasm b. Nucleoplasm c. Inside rough ER 26. Which organelle is involved most closely with translation? a. Smooth ER b. Rough ER c. Ribosomes d. Nucleus 27. Which enzyme is involved in transcription? a. DNA polymerase b. RNA polymerase c. Helicase d. Ligase Putman/Pierce College Biol px2/ /Page 4
5 28. Which does not match up in transcription? a. DNA adenine attracts RNA thymine b. DNA thymine attracts RNA adenine c. DNA cytosine attracts RNA guanine d. DNA guanine attracts RNA cytosine 29. Which molecule carries amino acids to the site of polypeptide synthesis? a. rrna b. cdna c. trna d. aminoacyl-trna-synthetase 30. At the beginning of polypeptide synthesis, anticodons initially match up with their complements in which site? a. E b. P c. A d. G 31. Except after the initial binding of the anticodon at the beginning of polypeptide synthesis, when an anticodon binds and the ribosome then moves, where is the anticodon? a. A site b. P site c. E site d. G site 32. The trna in the A site receives the polypeptide chain from which site? a. G b. A c. P d. E 33. After a trna gives up its polypeptide chain, the ribosome moves down and the trna leaves from which site? a. E b. G c. A d. P 34. Which enzyme attaches new amino acids onto the molecule that transports them to the site of polypeptide synthesis? a. RNA polymerase b. Aminoacyl-tRNA synthetase c. DNA polymerase d. ligase Putman/Pierce College Biol px2/ /Page 5
6 35. Once polypeptides are made, where are they processes into proteins? a. Smooth ER b. Rough ER c. Ribosome FOR QUESTIONS 36 THROUGH 40 USE THE FOLLOWING: 36. The DNA triplet that would produce the amino acid serine (ser): a. AGC b. GGC c. TCG d. UCG 37. The anticodon corresponding to the DNA triplet AAA: a. UUU b. CCC c. GGG d. AAA 38. The DNA triplet corresponding to the codon AUG: a. TAC b. CAT c. UAC d. AUG 39. The amino acid coded for by the DNA code: ATGACAAGA a. Phe Cys Ser b. Tyr Cys Ser c. Met Cys Lys d. Lys Phe Tyr Putman/Pierce College Biol px2/ /Page 6
7 40. A codon that would code for the amino acid glycine: a. CCG b. CCU c. GUU d. GGU KEY 1c, 2d, 3e, 4c, 5a, 6d, 7e, 8b, 9e, 10c, 11a, 12b, 13c, 14c, 15a, 16b, 17b, 18b, 19b, 20a, 21d, 22e, 23b, 24b, 25a, 26c, 27b, 28a, 29c, 30b, 31b, 32c, 33a, 34b, 35b, 36a&c, 37d, 38a, 39b, 40d. Putman/Pierce College Biol px2/ /Page 7
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