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
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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
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.
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?
The exchange of gases across a respiratory surface always occurs by
A. facilitated transport. B. diffusion. C. active transport. D. bulk flow. E. osmosis.