Biochemical pathways

"A branched biochemical pathway synthesizes two related essential amino acids D and F. A mutant defective for enzyme 2 will grow on minimal medium supplemented with which compounds?" The picture drawn with this problem looks something like this (I'll also attach a Word file in case this is unclear: 1 2 4 precursor ---> A ---> B ---> C ---> D 3 5 ---> E ---> F So that A leads to B, and B leads to either C then D (on one pathway), or to E then F (on a different pathway). I thought the answer would have been B. Mutant 2, if given compound B, can synthesize its own C, then D. But the answer given i... click for more

genetics punnet square , sex lethal etc

In sheep the polled condition ( hornless ) is controlled by a single gene locus with two alleles. Heterozygous females are polled but heterozygous males have horns. Suppose two Heterozygous sheep were crossed. Refer to attachment for multiple choice questions.

Guide for Population-Genetics Problems using the Hardy-Weinberg Equilibrium.

In a particular flower, a single pair of alleles determines the petal color (C). Red flowers have the genotype CR/CR (homozygous for CR), white flowers have the genotype Cr/Cr (homozygous for Cr) and pink flowers have the genotype CR/Cr (they are heterozygous). In a given population, 49 flowers had red petals, 42 had pink petals and 9 had white petals. What are the frequencies of the CR and Cr alleles?

phage titers

how do you prepare lysates that give high titers for virulent phage?

inefficient missense mutation suppressors

Hi. Can someone please explain the following answer to me: Q: Do you think that the mutated anticodon ACU (which inserts serine) can suppress a particular missense mutation? A: Yes, the mutated anticodon should insert serine at Trp codons. Thus, some missense mutants that have a Trp replacement in the defective protein might be suppressed by insertion of Ser. Since the suppressor is probably inefficient, missense suppression should be most often observed in proteins that can do their jobs at low concentrations (like enzymes). I understand everything but the last sentence. What does it mean that the suppressor is probably inefficient? And at low concentrations of what? Amino acids? ... click for more