/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 4 For each genetic disease, indica... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 19: Problem 4

For each genetic disease, indicate which enzyme is lacking or defective and the characteristic symptoms of the disease. a. PKU b. Tay-Sachs disease

Short Answer

Expert verified
PKU lacks phenylalanine hydroxylase; symptoms include intellectual disabilities. Tay-Sachs lacks Hex-A; symptoms involve neurological issues.

Step by step solution

01

Understanding PKU

PKU stands for Phenylketonuria, a genetic disorder. This condition results from a defect in the enzyme phenylalanine hydroxylase, which is responsible for converting the amino acid phenylalanine into another amino acid, tyrosine.
02

Symptoms of PKU

Individuals with PKU often display symptoms such as intellectual disabilities, seizures, behavioral problems, and skin rashes. Without treatment, phenylalanine can accumulate to harmful levels, leading to brain damage.
03

Understanding Tay-Sachs Disease

Tay-Sachs disease is a genetic disorder caused by a deficiency in the enzyme hexosaminidase A (Hex-A), which is vital for breaking down fatty substances in the brain and nerve cells.
04

Symptoms of Tay-Sachs Disease

Characteristic symptoms of Tay-Sachs disease include muscle weakness, loss of motor skills, increased startle response, and developmental delay, which typically appear around six months of age and lead to severe neurological impairment.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

PKU
PKU, or Phenylketonuria, is a genetic disease caused by a problem with a specific enzyme in the body called phenylalanine hydroxylase. This enzyme plays an important role in converting the amino acid phenylalanine into another amino acid known as tyrosine. If this enzyme doesn't work correctly, phenylalanine builds up to dangerous levels in the body, as it cannot be properly broken down. This can lead to several serious health issues if not managed properly through diet and other therapies.
Tay-Sachs Disease
Tay-Sachs disease is another genetic disorder but it affects a different enzyme known as hexosaminidase A (Hex-A). This enzyme is crucial in breaking down fatty substances in the brain and nerve cells. When Hex-A is deficient, these fatty substances accumulate, damaging nerve cells and leading to severe neurological issues. Tay-Sachs disease tends to reveal its symptoms in infancy and progresses rapidly, making it a devastating condition for affected children and their families.
Enzyme Deficiency
Enzyme deficiency is a condition where an enzyme is either missing or not functioning properly, leading to various health issues. In genetic disorders like PKU and Tay-Sachs, specific enzyme deficiencies are responsible for the symptoms seen in affected individuals.
  • For PKU, the deficiency involves the enzyme phenylalanine hydroxylase.
  • In Tay-Sachs, the issue lies with hexosaminidase A.
Recognizing these deficiencies early in life, often through newborn screening programs, allows for earlier intervention and management. This is vital for improving the quality of life and outcomes for people affected by these conditions.
Symptoms
Symptoms of genetic enzyme deficiencies vary depending on which enzyme is affected.
In PKU, symptoms can include:
  • Intellectual disabilities
  • Seizures
  • Behavioral problems
  • Skin rashes
Without proper treatment, these symptoms can lead to permanent brain damage.
In Tay-Sachs disease, the symptoms include:
  • Muscle weakness
  • Loss of motor skills
  • Increased startle response
  • Developmental delay
These symptoms usually appear around six months of age and continue to worsen, significantly impacting the individual's life.
Phenylketonuria
Phenylketonuria, also known as PKU, is primarily a metabolic disorder caused by genetic mutations that impair the production or function of phenylalanine hydroxylase. When this enzyme is missing or defective, it causes phenylalanine to accumulate in the body.
This buildup can cause brain damage, leading to intellectual disabilities and other neurological problems if not managed.
Management typically involves a special diet low in phenylalanine and regular blood tests to monitor levels, allowing most people with PKU to lead healthier lives.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A particular DNA coding segment is TACGACGTAACAAGC. a. Write the sequence of nucleotides in the corresponding mRNA. b. Determine the amino acid sequence formed from the mRNA in Exercise 10 a during translation. c. What amino acid sequence results from each of the following mutations? a. replacement of the underlined guanine by adenine b. replacement of the underlined adenine by thymine

A particular DNA coding segment is ACGTTAGCCCCAGCT. a. Write the sequence of nucleotides in the corresponding mRNA. b. Determine the amino acid sequence formed from the mRNA in Exercise 9a during translation. c. What amino acid sequence results from each of the following mutations? a. replacement of the underlined guanine by adenine b. insertion of thymine immediately after the underlined guanine c. deletion of the underlined guanine

One of the key pieces of information that Watson and Crick used in determining the secondary structure of DNA came from experiments done by E. Chargaff, in which he studied the nucleotide composition of DNA from many different species. Chargaff noted that the molar quantity of A was always approximately equal to the molar quantity of \(\mathrm{T}\), and the molar quantity of C was always approximately equal to the molar quantity of G. How were Chargaff's results explained by the structural model of DNA proposed by Watson and Crick?

Describe how replication and transcription differ.

Myoglobin, a protein that stores oxygen in muscle cells, has been purified from a number of organisms. The protein from a sperm whale is composed of 153 amino acid units. What is the minimum number of nucleotides that must be present in the mRNA that codes for this protein?
See all solutions

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Read Explanation

Chemical Reactions

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Making Measurements

Read Explanation

Kinetics

Read Explanation

The Earths Atmosphere

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.