302%20Spring%202010%20Exam%202%20vA%20answered

302%20Spring%202010%20Exam%202%20vA%20answered - Name: _...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Name: ____________________________ _______ BIOL 302 Exam #2 SPRING 2010 ID: A 1 302 Spring 2010 exam 2A Select the single best answer for each question Consider the pathway below. If a person were doubly homozygous for mutations causing both PKU and AKU, what disease symptoms would expect that person to exhibit? 1) a) a person could not have mutations affecting two steps in the same pathway b) symptoms of PKU c) symptoms of AKU d) symptoms of both PKU and AKU e) no symptoms 2) When the base composition of double-stranded DNA from Micrococcus luteus was determined, 35 percent of the bases were found to be cytosine. What is the percentage of adenine in the DNA of this organism? a) 15% b) 17.5% c) 25% d) 30% e) 35%
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Name: _________________________________ BIOL 302 EXAM #2 SPRING 2010 ID: A 2 3) Bateriophage P1 was grown on a wild type strain of E. coli and the resulting phage were used to infect a strain with three mutations, arg-, pro- and his-, which result in the inability to synthesize an amino acid: arginine, proline and histidine, respectively. Equal volumes of the infected culture were plated on minimal media suplemented with various combinations of amino acids (a plus sign indicates the amino acid was added to the plate, a minus sign indicates it was not). The number of colonies appearing on each plate is shown. Which statement about the relative distances between the three genes is true? plate supplement number of colonies arginine proline histidine 1 + + - 1000 2 + - + 1000 3 - + + 1000 4 + - - 200 5 - + - 100 6 - - + 0 a) pro and his are closest together, arg and pro are the farthest apart b) pro and his are the closest together, arg and his are the farthest apart c) arg and pro are the closest together, arg and his are the farthest apart d) arg and his are the closest together, arg and pro are the farthest apart e) arg and pro are the closest together, pro and his are the farthest apart 4) Seymour Benzer’s work in which he mapped individual mutations in the phage rII gene relative to each other showed: a) that a gene could be mutated in many ways, in principle having as many mutant alleles as there are base pairs in the gene b) that recombination could occur inside genes, not just between genes c) that the combination of three mutations of the same type could restore wild type function, impying the genetic code was triplet d) two of the above e) all of the above 5) Which statement about tRNAs is true? a) They are covalently modified with an amino acid when ‘charged’ b) They can enter all three sites on the ribosome (A, P and E) c) They have an ‘anticodon’ by which they pair with the codon in mRNA d) two of the above e) all of the above
Background image of page 2
Name: _________________________________ BIOL 302 EXAM #2 SPRING 2010 ID: A 3 6) Consider the following DNA sequence from the middle of a gene: 5’ - ATTCGGATTGCATG-3’ 3’- TAAGCCTAACGTAC-5’ What is the sequence of the mRNA made from this DNA sequence, assuming the promoter sequence is to the left? a)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 13

302%20Spring%202010%20Exam%202%20vA%20answered - Name: _...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online