Lactose Intolerance and Homeostasis Quiz

Use evidence from the model below to explain how the inability of Control Regions 1 and 2 to interact, preventing the expression of the LCT gene, impacts the ability of the digestive and circulatory systems to interact and maintain homeostasis within an organism with lactose intolerance.

• The inability to express the LCT gene prevents lactose from being broken down, leading to fermentation by bacteria, which produces gas and acids, causing digestive symptoms and disrupting homeostasis.

• The inability to express the LCT gene allows lactose to be fully digested, preventing any symptoms and maintaining perfect homeostasis.

• The inability to express the LCT gene increases the absorption of lactose into the blood, improving energy levels and homeostasis.

• The inability to express the LCT gene has no effect on the digestive or circulatory systems and does not impact homeostasis.

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Why is digestion considered an essential function in living organisms?

• Because it helps organisms break down food to obtain energy and nutrients.

• Because it allows organisms to move faster.

• Because it helps organisms breathe.

• Because it makes organisms grow taller.

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What is the role of proteins in an organism's ability to carry out digestion and other essential functions required for life?

• Proteins act as enzymes to speed up chemical reactions necessary for digestion and other functions.

• Proteins provide energy for the organism.

• Proteins store genetic information.

• Proteins help organisms reproduce.

What is the role of DNA in the production of proteins that carry out essential functions of life?

• DNA contains instructions for making proteins.

• DNA breaks down food during digestion.

• DNA provides energy for cells.

• DNA helps organisms move.

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Which cells in the small intestine produce the enzyme lactase?

• All cells in the body

• Specific cells of the small intestine

• Muscle cells

• Blood cells

What is the process called where embryonic stem cells develop into specialized cells such as muscle, nerve, and liver cells?

• Cell division

• Stem cell differentiation

• Photosynthesis

• Respiration

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Why do only specific cells in the small intestine produce lactase, while other cells in the body do not?

• Because all cells have the same function

• Because gene expression varies in different cells

• Because lactase is needed everywhere in the body

• Because only blood cells produce enzymes

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How might coding and non-coding DNA affect the production of specialized cells that carry out essential life functions?

• Coding DNA only produces proteins, while non-coding DNA has no effect

• Both coding and non-coding DNA regulate gene expression, influencing cell specialization

• Only coding DNA is important for cell specialization

• Non-coding DNA produces enzymes for all cells

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What percentage of adults around the world are lactose intolerant?

• Approximately 65%

• Approximately 25%

• Approximately 90%

• Approximately 10%

How are advances in science and technology making it possible to identify the causes of some genetic disorders and develop solutions or treatments?

• By allowing scientists to study ancient fossils only.

• By improving the ability to analyze DNA and genetic information.

• By focusing solely on environmental factors.

• By ignoring genetic differences between individuals.

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