Which of the following statements is INCORRECT for an X-linked recessive trait in humans?
a) Affected men often have phenotypically normal parents.
b) All sons of affected women will be affected.
c) Affected women always have an affected mother.
d) Affected men have a mother who carries the recessive allele.
Ans: c) Affected women always have an affected mother.
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Which functional groups have been altered in a ddNTP compared to a dNTP?
A) The ddNTPs have a 2? OH and a 3? H, while dNTPs have a 2? H and a 3? OH. B) The ddNTPs have a 2? H and a 3? H, while dNTPs have a 2? H and a 3? OH. C) The ddNTPs have a 2? OH and a 3? OH, while dNTPs have a 2? H and a 3? H. D) The ddNTPs have a 2? H and a 3? H, while dNTPs have a 2? OH and a 3? OH. E) The ddNTPs have a 2? H and a 3? OH, while dNTPs have a 2? H and a 3? H.
In the first experiment to test the pedometer hypothesis in Sahara desert ants, which results did the researchers obtain?
A. Ants with normal legs walked past the home nest, ants with stumps found the nest, ants with stilts were short of the nest B. Ants with stilts walked past the home nest, ants with normal legs found the nest, ants with stumps were short of the nest C. Ants with stumps walked past the home nest, ants with normal legs found the nest, ants with stilts were short of the nest D. None of the above
The proton pump is the process of
A. producing glyceraldehyde-3-phosphate in the stroma. B. forming ATP by creating a hydrogen ion gradient across a membrane. C. converting fats and proteins into carbohydrates. D. cellular respiration in plants.
When a B cell binds to its specific antigen, it undergoes ________ to produce antibodies to the antigen
a. reproduction b. clonal expansion c. clonal anergy d. differentiation