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Related Concept Videos

Glucose Transporters01:27

Glucose Transporters

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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
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Inducible Operons: lac Operon01:25

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Inborn Errors of Metabolism01:20

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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
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Operons02:09

Operons

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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

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Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
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Measuring Lactase Enzymatic Activity in the Teaching Lab
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Measuring Lactase Enzymatic Activity in the Teaching Lab

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Lactose Intolerance.

Louis N Aurisicchio, C S Pitchumoni

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    PubMed
    Summary
    This summary is machine-generated.

    Lactose intolerance is common in specific ethnic groups and can cause gastrointestinal issues. Early diagnosis and dietary changes are key for managing this condition.

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    Area of Science:

    • Gastroenterology
    • Human Nutrition

    Background:

    • Lactose intolerance is a widespread condition, particularly in certain ethnic populations.
    • It presents as a frequent cause of gastrointestinal complaints.
    • The condition can be secondary to intestinal diseases or medication use, and rarely congenital.

    Purpose of the Study:

    • To review the clinical evaluation methods for lactose intolerance.
    • To provide basic dietary recommendations for individuals with lactose intolerance.

    Main Methods:

    • Clinical evaluation of gastrointestinal complaints.
    • Assessment of patient history for associated conditions and medication use.

    Main Results:

    • Lactose intolerance should be considered in patients from high-prevalence ethnic groups presenting with GI symptoms.
    • Differential diagnosis includes other intestinal diseases and medication side effects.

    Conclusions:

    • Effective clinical evaluation and dietary management are crucial for patients with lactose intolerance.
    • Awareness of prevalence in specific populations aids diagnosis.