As a result of experimentation on lactose-intolerant individuals, scientists found that ___________.

A. a small change in a DNA nucleotide sequence can have a major effect on the production of lactase
B. a mutation within the lactase gene is responsible for lactose intolerance
C. males are more likely to be lactose intolerant than females
D. the enzyme lactase is not encoded by a DNA gene


A. a small change in a DNA nucleotide sequence can have a major effect on the production of lactase

Biology & Microbiology

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In this diagram, which of the following numbers represents the actual event of egg activation?



A. I
B. II
C. III
D. IV
E. V

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A lung infection caused by bacteria which become encapsulated in the lungs is

A. rheumatic fever. B. pulmonary fibrosis. C. emphysema. D. pneumonia. E. tuberculosis.

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Turbinates were found in therapsids, extinct reptiles thought to be ancestors of mammals. What could the researchers conclude from this observation?

What will be an ideal response?

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The exchange of gases across a respiratory surface always occurs by

A. facilitated transport. B. diffusion. C. active transport. D. bulk flow. E. osmosis.

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