PCQ 8-2

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University of Hawaii *

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130

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Biology

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Jan 9, 2024

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6

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Attempt History Attempt Time Score KEPT Attempt 2 11 minutes 40 out of 40 LATEST Attempt 2 11 minutes 40 out of 40 Attempt 1 42 minutes 39 out of 40 PCQ 8­2 Due Oct 14 at 12:50pm Points 40 Questions 23 Available until Oct 14 at 12:50pm Time Limit None Allowed Attempts 3 Correct answers will be available on Oct 16 at 12am. Score for this attempt: 40 out of 40 Submitted Oct 13 at 10:17pm This attempt took 11 minutes. Take the Quiz Again 1 / 1 pts Question 1 promoter is a RNA sequence of base bound on the template True False 1 / 1 pts Question 2 terminator is a specific RNA base sequence on the template True False 1 / 1 pts Question 3 each codon is made of three bases True False 1 / 1 pts Question 4 each codon specifies a single amino acid.
True False 1 / 1 pts Question 5 ____ is a string of ribosomes on the same mRNA strand. Polysome 1 / 1 pts Question 6 In tryptophan operon model, added tryptophan can inhibit tryptophan synthesizing enzyme. True False 1 / 1 pts Question 7 An insertion sequence (IS) is a small segment of DNA with about 1,000 base pairs. IS has no genetic information other than for the enzyme transposase, which is needed to move the IS to a new location in a DNA molecule. True False 1 / 1 pts Question 8 The Ames test determines the mutagenic effect of a chemical substance on Salmonella enterica, giving an indication of whether the substance can cause a mutation in humans. True False 1 / 1 pts Question 9 Transposable genetic elements may cause mutations by interrupting the coding sequence in genes, thereby often resulting in no protein being produced. True False
4 / 4 pts Question 10 match it starts with AUG codon initiation large ribosomal subunit is added to form the functional ribosome initiation start with one of UGA, UAG, and UAA codons termination ribozyme tranfers peptide to a new amino acid elongation 1 / 1 pts Question 11 ____ is (are) nucleotide segments that encode amino acid residues. exon 1 / 1 pts Question 12 RNA is syntehsized in the direction of 5' to 3'. True False 1 / 1 pts Question 13 _____ is (are) nucleotide segments that removed after transcription and that regulate gene expression intron 5 / 5 pts Question 14 match point mutation one point alteration silent mutation no change of amino acid sequ
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missense mutation wrong amino acid replaced wi nonsense mutation generation of a stop codon base­pair deletion/insertion shift of a reading frame to prod 3 / 3 pts Question 15 match mRNA carries codon to ribosome tRNA carries amino acid to ribosome rRNA comprise ribosomes with prote 3 / 3 pts Question 16 mtach inhibit chain elongation by binding to 50S subunit chloramphenicol and erythrom binds to RNA polymerase so that transcription cannot be initiated rifampin prevents chain initiation by binding to the 30S subunit tetracycline 5 / 5 pts Question 17 match UV light thymidine dimers produced in X rays cause double-stranded breaks nitrous acid convert adenine to hypoxanthi bromouracil
In tryptophan operon model, a acyclovir antiviral agent, to substitute fo 1 / 1 pts Question 18 transfer RNA has anticodon complementary to an mRNA codon True False 3 / 3 pts Question 19 match sense codon specify an amino acid stop codon UGA, UAG, and UAA start codon AUG 1 / 1 pts Question 20 Operon includes the following EXCEPT regulatory gene promoter operator structural gene none of the above 1 / 1 pts Question 21 RNA polymerase reads the DNA template strand in the 3’ to 5’ direction. True False
1 / 1 pts Question 22 In lactose operon model, added lactose can bind to ______ that RNA polymerase structural gene transcription promoter operator repressor protein structural genes regulatory gene 1 / 1 pts Question 23 RNA polymerase binds promoter, unwinds the helix, and separates the two strands within the gene. True False Quiz Score: 40 out of 40
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