Understanding Lactose Intolerance

Based on the information provided, why might lactose intolerance be more prevalent in certain ethnic groups?

• Genetic factors that affect enzyme production

• Dietary habits that reduce lactose exposure

• Environmental factors unrelated to diet

• Differences in milk consumption during childhood

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If a person is suspected of being lactose intolerant, which method is preferred to confirm the diagnosis and why?

• Intestinal biopsy, because it directly measures enzyme activity

• Blood glucose test, because it is less invasive and reliable

• Observing symptoms, because they are consistent and easy to identify

• Genetic testing, because it identifies the root cause

How does the enzyme secreted by the small intestine facilitate the digestion of lactose?

• It combines lactose with other sugars to form a digestible compound

• It breaks down lactose into glucose and galactose

• It neutralizes lactose, making it less harmful

• It converts lactose into a protein

What reasoning might explain the lower prevalence of lactose intolerance in the Tussi tribe compared to the Ganda tribe?

• The Tussi tribe has a genetic mutation that enhances lactose digestion

• The Tussi tribe's diet includes more dairy, leading to enzyme adaptation

• The Ganda tribe has a cultural aversion to dairy products

• The Ganda tribe has a higher rate of gastrointestinal diseases

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Why might clinical symptoms of lactose intolerance, such as gas and diarrhea, be considered unreliable for diagnosis?

• They are common symptoms for many gastrointestinal issues

• They only occur in severe cases of lactose intolerance

• They can be easily misinterpreted by patients

• They are not directly linked to lactose digestion

What strategic approach would you recommend to a researcher studying lactose intolerance across different ethnic groups?

• Conduct surveys on milk consumption habits

• Perform genetic testing to identify enzyme production differences

• Analyze historical dietary patterns of each group

• Compare lactose intolerance rates with other dietary intolerances

Tags

NGSS.HS-LS4-2

If a person weighing 70 kg is to be tested for lactose intolerance, what is the maximum dose of lactose they should ingest for the test?

• 70 grams

• 100 grams

• 140 grams

• 200 grams

What evidence from the text suggests that lactose intolerance is not solely a modern phenomenon?

• The high prevalence of intolerance in non-cattle herding tribes

• The development of lactose-free products in recent years

• The historical assumption that intolerance was unusual

• The variability of symptoms among individuals

How might the findings from the study of American blacks and whites influence public health recommendations?

• Encourage all individuals to avoid dairy products

• Promote lactose-free diets for specific ethnic groups

• Increase awareness and testing for lactose intolerance

• Develop new medications to enhance lactose digestion

What reasoning supports the use of blood glucose levels as a reliable measure for lactose digestion?

• It directly correlates with the amount of lactose digested

• It is unaffected by other dietary factors

• It provides immediate results

• It is less expensive than other methods