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There are three classifications of lactose intolerance. The two most common are environmentally induced, the third is a result of genetics.
1. Primary lactose intolerance. Environmentally induced when weaning a child in non-dairy consuming societies. This is found in many Asian and African cultures, where industrialized and commercial dairy products are uncommon.
2. Secondary lactose intolerance. Environmentally induced, resulting from certain gastrointestinal diseases, including exposure tointestinal parasites such as Giardia lamblia. In such cases the production of lactase may be permanently disrupted. A very common cause of temporary lactose intolerance is gastroenteritis, particularly when the gastroenteritis is caused by rotavirus. Another form of temporary lactose intolerance is lactose overload in infants.
3. Congenital lactase deficiency. A genetic disorder which prevents enzymatic production of lactase. Present at birth, and diagnosed in early infancy.
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What is a factor that pushed puritans and pilgrims to America?
religious intolerance
Identify a key factor in producing cellular adaptation in the body?
One key factor in producing cellular adaptation in the body is exposure to various stressors, such as exercise, environmental changes, or nutrient availability. Cells respond to these stressors by changing their gene expression and cellular processes to adapt and maintain homeostasis.
What environmental factor causes the lac operon to turn on?
In the lac operon model, lactose acts as in inducer molecule. In the presence of lactose, the molecule binds to the repressor protein. This repressor-lactose complex is unable to bind to the promoter. When the promoter is not occupied, RNA pol - II binds to it and begins transcribing the structural genes located downstream. Thus, the lac operon is turned on in the presence of lactose.
What is the environmental factor that causes a predispostion to malignant melanoma?
The environmental factor is excessive sun exposure.
Is a lack of rain a limiting factor or an adaptation to a organism's area?
limiting factor
What is the definition for environmental factor?
If you can feel it, see it, hear it, taste it or smell it, it is an environmental factor. We tend to use the words "environmental factor" only for negative attributes, like loud noises or nasty smells. But anything that you can sense in the environment (which is everything around you) is an "environmental factor".
What was the one factor that caused Muslims to resent the Portuguese explorers?
Religous intolerance of Hindus.
How is glucose an important factor in lactose synthesis?
Glucose is important for lactose synthesis because it provides the substrate for the enzyme lactose synthase to combine with galactose to form lactose. Without glucose, there would not be enough substrate available for lactose synthesis to occur efficiently. Additionally, glucose can stimulate the production of lactose synthase enzyme, further promoting lactose synthesis in mammary glands.
Is water an environmental factor?
Yes.
UV radiation is this type of factor that can lead to cancer?
Environmental Factor.
What is the definition of limiting factor?
it is an environmental factor that causes a population to decrease.
Which factor characteristic of cities most likely led to this adaptation?
noise pollution
