Exam IV 1710_1711 F'01

Exam IV 1710_1711 F'01 - Principles of Biology I Exam IV...

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Principles of Biology I Exam IV Sample 1. The sequence of nucleotides to which a repressor protein binds (e.g. in the lac or trp operons) is called a/an: a. promoter. b. operator. c. enhancer. d. CAP site. e. None of the above is the correct answer. 2. The ribozymes and the associated proteins which function to help splice out the intervening sequences from primary RNA transcripts (newly made RNAs) in eukaryotes are called: a. restriction endonucleases. b. recombinases. c. translocases. d. splicesomes. e. ribonucleases. 3. The codon 5’-UAA-3’ is read by the “A” site of the ribosome as: a. stop (end of protein). b. the amino acid methionine. c. start (a new protein here). d. an amino acid that is not methionine. e. translocate to the “A” site. 4. Which of the following is NOT true of eukaryotic messenger RNA molecules ready for translation in the cytoplasm? a. They often contain the coding sequences for 2 or more proteins. b. They are commonly monocistronic. c. All introns have been removed. d. They have a have a poly A tail at the 3' end. e. All of the above statements are true. 5. An example of a genetic element (small circular DNA replicon) common
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in prokaryotes, which often naturally carries useful but generally not essential genes (such as antibiotic resistance genes) and is frequently used in recombinant DNA/biotechnology as a cloning vehicle is a/an: a. operon. b. intron. c. plasmid. d. replicon. e. bacteriophage. 6. Most of the exceptions to the “universality” of the genetic code have been found to occur in: a. genes in bacteria. b. eukaryotic nuclear encoded genes only. c. organelle genomes. d. oncogenes. e. None of the above are correct answers. 7. Enzymes which cut DNA duplexes, but only a specific nucleotide sequences, and which are commonly used in DNA cloning experiments are: a. primases. b. PCRs. c. restriction endonucleases (restriction enzymes). d. reverse transcriptase. e. far too picky about their substrates. 8. Which of the following properties is not shared by RNA polymerases and DNA polymerases? a. carry out proofreading b. make the polynucleotide product in a 5Õ to 3Õ direction c. use nucleotide triphosphates as substrates d. are found in the nuclei of eukaryotic cells
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e. require a template 9. Normal eukaryotic genes which can, if properly mutated, act in a dominant fashion to cause a cell to become transformed (tumor producing) are called: a. oncogenes. b. protooncogenes. c. retroviruses. d. transforming principles. e. tumor suppressors. 10. A constitutive gene is one that is: a. expressed at a constant rate at all times. b. inducible by a specific small molecule. c. repressible by a specific small molecule. d. controlled by an operator sequence near the promoter. e.
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Exam IV 1710_1711 F'01 - Principles of Biology I Exam IV...

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