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Ch. 14 - Translation and Proteins

Chapter 14, Problem 14

Early detection and adherence to a strict dietary regimen have prevented much of the intellectual disability that used to occur in those with phenylketonuria (PKU). Affected individuals now often lead normal lives and have families. For various reasons, such individuals tend to adhere less rigorously to their diet as they get older. Predict the effect that mothers with PKU who neglect their diets might have on newborns.

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Hello everyone and welcome to today's video. So a genetic disorder known as P. K. U. Is caused by the lack of an enzyme that converts fennel alunan into tyrosine. Identify the incorrect statement regarding P. K. You remember that we're looking for the incorrect statement. I'm honored answer choices and also realized that the main cause of this P. K. U. Illness is the accumulation of melanin in blood. Since we don't have the enzyme that converts it into Tarzan and this may lead to many negative effects. Knowing that let's look at answer choice. A patients with PK you frequently have mis sense mutations in the P. A. H. Gene. Remember that this ph gene is going to be responsible for encoding for this enzyme that converts fennel alunan into tyrosine. If we have mutations and this ph gene is not working then this final alunan will accumulate in blood. This is a correct statement. So we're going to cancel it out because we're looking for the incorrect one. Now we have C. P. K. U. Is caused by a deficiency of both PH which we said was true and I hide drop terry Dean reductive. This is actually a correct statement as well. These are both causes that can lead to these P. K. U. So we're going to cancel this out. Then we have byob tearing treatment does not work for all P. K. U. Patients. And the key word here is does not remember that biopsy arian is going to lead to a decrease in phenylalanine in the blood. Because of this. It is going to have a very positive effect in these patients that have the accumulation of phenylalanine in blood causing disease. Because of these, these biopsy Arian treatment is going to be able to work for all p. K. U. Patients and we're going to highlight this as the incorrect answer or the incorrect statement that we were looking for. I really hope this helped you enough to see you on the next one.
Related Practice
Textbook Question

A short RNA molecule was isolated that demonstrated a hyperchromic shift (see Chapter 10), indicating secondary structure. Its sequence was determined to be

     5'-AGGCGCCGACUCUACU-3'

If the molecule were an internal part of a message, what amino acid sequence would result from it following translation? (Refer to the code chart in Figure 13.7.)

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Textbook Question

A short RNA molecule was isolated that demonstrated a hyperchromic shift (see Chapter 10), indicating secondary structure. Its sequence was determined to be

     5'-AGGCGCCGACUCUACU-3'

If the molecule were a tRNA fragment containing a CGA anticodon, what would the corresponding codon be?

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Textbook Question
Individuals with phenylketonuria cannot convert phenylalanine to tyrosine. Why don't these individuals exhibit a deficiency of tyrosine?
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Textbook Question

Refer to Figure 13.7 to respond to the following:

Shown here is a hypothetical viral mRNA sequence:

 5'-AUGCAUACCUAUGAGACCCUUGGA-3'

Assuming that it could arise from overlapping genes, how many different polypeptide sequences can be produced? What are the sequences?

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Textbook Question

Most proteins have more leucine than histidine residues, but more histidine than tryptophan residues. Correlate the number of codons for these three amino acids with this information.

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Textbook Question
The study of biochemical mutants in organisms such as Neurospora has demonstrated that some pathways are branched. The data shown in the following table illustrate the branched nature of the pathway resulting in the synthesis of thiamine: Growth Supplement _ Mutation Minimal Medium Pyrimidine Thiazole Thiamine thi-1 − − + + thi-2 − + − + thi-3 − − − + Why don't the data support a linear pathway? Can you postulate a pathway for the synthesis of thiamine in Neurospora?
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