Homework Answers
1) the mutant can grow when the intermediate D is given to the media, but it cannot grow in the presence of A, B or C, so the mutation is in the enzyme 3 which converts C to D, so the mutant cannot grow in the presence of A, B, C these intermediates cannot be processed to the final metabolite, the reaction will stop at C, so the answer is c) enzyme 3.
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1. As seen below, A-D refer to intermediates in the arginine biosynthesis pathway. Enzyme 1 Enzyme...
The table below presents the ability of five strains of Neurospora crassa that are deficient in...
The table below presents the ability of five strains of Neurospora crassa that are deficient in arginine biosynthesis to grow on media supplemented with molecules that are biochemical intermediates in the arginine synthesis pathway (“+” = growth, “-“ = no growth). a) Based on these data, diagram both the biochemical intermediates and genes in the arginine synthesis pathway. Mutant strain minimal media +arginine +citrulline +ornithine argA - + - - argB - + ...
B 3 - E- F 5 The figure above showing a branched metabolic pathway leading to...
B 3 - E- F 5 The figure above showing a branched metabolic pathway leading to the synthesis of two related amino acids (D and F) in N. crassa. Both are required for growth. 5 pts I) If an N. crassa strain has a genetic defect that results in nonfunctional Enzyme 1, could the strain grow if supplemented with compound C in minimal medium? If a strain carries a mutation in the gene encoding Enzyme 2, will it be able...
Questions 17 and 18 please! 17. The pathway for arginine biosynthesis in Neurospora crassa involves several...
Questions 17 and 18 please!
17. The pathway for arginine biosynthesis in Neurospora crassa involves several enzymes that produce a series of intermediates as shown. ARG-E ARG-F ARG-G ARG-H N-acetylornithine ornithine citrulline → argininosuccinate arginine You did a cross between ARG-E- ARG-H+ and ARG-E+ARG-H Neurospora strains and identified an Arg- strain from an NPD tetrad. (Assume that Neurospora forms tetrads in the same way yeast do.) Which compound(s) from the above pathway would rescue growth of this Arg- spore: 18....
A Lab has isolated a gene, CFE1, that encodes an enzyme (Cfe1) that completes one step...
A Lab has isolated a gene, CFE1, that encodes an enzyme (Cfe1) that completes one step of the conversion of caffeine into adenine. to check if CFE1 might be the gene that is mutated in one of the mutants discovered in the original screen. cross each one of the mutants with a strain that has the CFE1 gene fully deleted (cfe14). allow the resulting diploid strain to go through meiosis and produce haploid gametes (“spores") to individually check for the...
Drag each statement below to classify it as true or false to review the studies that...
Drag each statement below to classify it as true or false to
review the studies that revealed the specifics of gene function in
organisms.
Drag each statement below to classify it as true or false to review the studies that revealed the specifics of gene function in organisms. All Neurospora mutants unable to synthesize arginine contained the same mutation in a single gene. At least four genes control arginine Synthesis in Neurospora, and these acted on different enzymes in the...
need help with question 2, 4, 6 a.&b. 2. For a (fictitious) haploid fungus, the starting...
need help with question 2, 4, 6 a.&b.
2. For a (fictitious) haploid fungus, the starting point in the biosynthesis of the amino acid arginine is Compound X, which is always present in, and absorbed from the environment. The arginine biosynthetic pathway is: Enzyme B → Compound Y Compound z Enzyme C Compound X Enzyme A arginine A mutant strain of genotype a (lacking enzyme A) is crossed to a mutant strain of genotype c (lacking enzyme C). What proportion...
Imagine you do a version of the Beadle-Tatum experiment in which you attempt to test the...
Imagine you do a version of the Beadle-Tatum experiment in which you attempt to test the one-gene, one-enzyme hypothesis, but using the pathway of synthesis of amino acid Q from X (below). The reactions, in order, are catalyzed by enzymes E1-E5. X is always present in cells, and cells need Q to grow. E1 E2 E3 E4 E5 - xty 2 z 3 photo You identify a mutant strain that doesn't grow in normal medium, but does grow in medium...
30) E. colt' (illustrated in the figure below). Thus, the first enzyme of the pathway will...
30) E. colt' (illustrated in the figure below). Thus, the first enzyme of the pathway will have an active site that binds to the amino acid aonine and an allosteric site that binds to the amino acid s metabolic pathway synthesizing isoleucine from threonine is subject to feedback inhibition Threonine 31) You are interested in harnessing E. coli for the large scale commercial production of the amino acid isoleucine from threonine. You Enzyme A have optimized the growth conditions, but...
table for reference for question 4 table h ell-free synoms produce Golshopecule consisting of a string...
table for reference for question 4 table
h ell-free synoms produce Golshopecule consisting of a string of urucille RNA free systems produced the polypeptide poly string of phenylalanine amino acids phenylalanine ed entymes to produkce RNA polymers with they leotide. These polymers allowed them to inter to signal "start" and is therefore the art codon. In this case the as a dual function because also encodes the mind methionine (Met). You can see that 61 codons are more than enough...
3. (7) Suppose that you have selected E cofthat can grow only when the medium is...
3. (7) Suppose that you have selected E cofthat can grow only when the medium is supplemented with cysteine. You isolate one mutant that you believe is defective in a new gene require for cysteine biosynthesis- sX You have two strains of bacteria: Hitr cysX- galehislac+ purtrpefort cysX+gal-his-tac-pur-trp-tort A) What supplements would you need to add to minimal media to recover all cysX lach, fon recombinants? Would you add glucose? B) What recombinant genotypes would you recover on plates containing...
B 3 - E- F 5 The figure above showing a branched metabolic pathway leading to the synthesis of two related amino acids (D and F) in N. crassa. Both are required for growth. 5 pts I) If an N. crassa strain has a genetic defect that results in nonfunctional Enzyme 1, could the strain grow if supplemented with compound C in minimal medium? If a strain carries a mutation in the gene encoding Enzyme 2, will it be able...
Questions 17 and 18 please!
17. The pathway for arginine biosynthesis in Neurospora crassa involves several enzymes that produce a series of intermediates as shown. ARG-E ARG-F ARG-G ARG-H N-acetylornithine ornithine citrulline → argininosuccinate arginine You did a cross between ARG-E- ARG-H+ and ARG-E+ARG-H Neurospora strains and identified an Arg- strain from an NPD tetrad. (Assume that Neurospora forms tetrads in the same way yeast do.) Which compound(s) from the above pathway would rescue growth of this Arg- spore: 18....
A Lab has isolated a gene, CFE1, that encodes an enzyme (Cfe1) that completes one step of the conversion of caffeine into adenine. to check if CFE1 might be the gene that is mutated in one of the mutants discovered in the original screen. cross each one of the mutants with a strain that has the CFE1 gene fully deleted (cfe14). allow the resulting diploid strain to go through meiosis and produce haploid gametes (“spores") to individually check for the...
Drag each statement below to classify it as true or false to
review the studies that revealed the specifics of gene function in
organisms.
Drag each statement below to classify it as true or false to review the studies that revealed the specifics of gene function in organisms. All Neurospora mutants unable to synthesize arginine contained the same mutation in a single gene. At least four genes control arginine Synthesis in Neurospora, and these acted on different enzymes in the...
need help with question 2, 4, 6 a.&b.
2. For a (fictitious) haploid fungus, the starting point in the biosynthesis of the amino acid arginine is Compound X, which is always present in, and absorbed from the environment. The arginine biosynthetic pathway is: Enzyme B → Compound Y Compound z Enzyme C Compound X Enzyme A arginine A mutant strain of genotype a (lacking enzyme A) is crossed to a mutant strain of genotype c (lacking enzyme C). What proportion...
Imagine you do a version of the Beadle-Tatum experiment in which you attempt to test the one-gene, one-enzyme hypothesis, but using the pathway of synthesis of amino acid Q from X (below). The reactions, in order, are catalyzed by enzymes E1-E5. X is always present in cells, and cells need Q to grow. E1 E2 E3 E4 E5 - xty 2 z 3 photo You identify a mutant strain that doesn't grow in normal medium, but does grow in medium...
30) E. colt' (illustrated in the figure below). Thus, the first enzyme of the pathway will have an active site that binds to the amino acid aonine and an allosteric site that binds to the amino acid s metabolic pathway synthesizing isoleucine from threonine is subject to feedback inhibition Threonine 31) You are interested in harnessing E. coli for the large scale commercial production of the amino acid isoleucine from threonine. You Enzyme A have optimized the growth conditions, but...
table for reference for question 4 table
h ell-free synoms produce Golshopecule consisting of a string of urucille RNA free systems produced the polypeptide poly string of phenylalanine amino acids phenylalanine ed entymes to produkce RNA polymers with they leotide. These polymers allowed them to inter to signal "start" and is therefore the art codon. In this case the as a dual function because also encodes the mind methionine (Met). You can see that 61 codons are more than enough...
3. (7) Suppose that you have selected E cofthat can grow only when the medium is supplemented with cysteine. You isolate one mutant that you believe is defective in a new gene require for cysteine biosynthesis- sX You have two strains of bacteria: Hitr cysX- galehislac+ purtrpefort cysX+gal-his-tac-pur-trp-tort A) What supplements would you need to add to minimal media to recover all cysX lach, fon recombinants? Would you add glucose? B) What recombinant genotypes would you recover on plates containing...
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