Exam3v3Answ - Bio2600 Introduction to Cell Biology name Dec...

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Bio2600: Introduction to Cell Biology name Dec., 2005. Exam 3 - 50 Questions Section 1: Complete each sentence with one of the two words or phrases found in the square brackets [A. / B. ] . 1. Alu and L1 elements are [A. retrotransposons/B. viruses] that make up a large percentage of human DNA. 2. Movement of flagella d epends primarily on the activity of a motor protein from the [A. dynein/B. kinesin] family. 3. The paternal and mater nal copies of human chromosome 1 are considered [A. homologous/ B. non-homologous] chromosomes. 4. [A. Introns/ B. Exons] contain protein-coding information. 5. Vote on Clickers. You will receive credit for either a yes or no answer. There is a chance that the professor's computer did NOT correctly detect all of your clicker responses. As this could affect the calculation of your final grade you vote [A. YES keep/ B. NO remove] the clicker points in the final grade calculation. 6. Degradation of cellular proteins in a proteosome is often triggered by [A. ubiquitination/ B. deamination] of the selected protein. 7. Microtubules and [A. i ntermediate filaments/ B. microfilaments] polymerize using very similar mechanisms. 8. Okasaki fragments are characteristic of the [A. leading/ B. lagging] strand. 9. The anti-codon ACC recognizes the codon [A. UGG/ B. GGU]. 10. Microtubules are stabilized by the drug [A. taxol/ B. cholchicine]. 11. When bidirectional rep lication forks from adjacent origins meet, a leading strand always runs into [A. a lagging strand/B. a leading strand]. 12. The finger-like extension of plasma membrane and bundles of actin at the leading edge of a moving cell is called a [A. lamellipodia/B. filopodia]. 13. Homologous recombination between sister chromosomes requires [A. short/ B. long] stretches of nearly identical DNA sequence. 14. The codon GAC encodes the amino acid [A. Asp/B. Gln]. 15. In eucaryotic cells, t he assembly of the general transcription factors begins with the binding of the factor [A. TFIID/B. TFIIH] to DNA, causing a dramatic local distortion in the DNA. 16. H istone [A. acetylase/B. deacetylase] is an enzyme that modifies histones and renders the DNA more accessible to general transcription factors. Page 1, v3
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17. The tryptophan repress or of bacteria binds to its regulatory DNA sequence when tryptophan is [A. present in high amounts/B. in low abundance]. 18. The enzyme Primase can polymerize [A. ribon ucleotides/ B. deoxy ribon ucleotides] to create the small primer used by DNA polymerase. 19. A string of nucleosomes can coil up to form a (A. 50 nm/ B. 30 nm) chromatin fiber. 20. DNA polymerase adds nucleotides to the [A. 5'-phosphate/B. 3'-OH] group of the growing strand. Section 2: Multiple Choice. Select the best possible answer using your knowledge of Cell Biology.
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