Cystic fibrosis is caused by a mutation in the gene that encodes which enzyme?

A) Pyruvate kinase
B) CFTR protein
C) Hexosaminidase A
D) Hemoglobin
E) Tyrosine kinase


B

Biology & Microbiology

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Use a specific example to explain how a negative feedback mechanism may be used to regulate the

function of endocrine glands. What will be an ideal response?

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A long day plant will flower when exposed to short nights

____________________ Indicate whether the statement is true or false.

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Injecting fibroblasts with anti-Ras antibodies that inactivate Ras proteins increases cell division response to growth

factors. __________________ Indicate whether the statement is true or false.

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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.

Biology & Microbiology