Which is not a role of the cystic fibrosis transmembrane conductance regulator (CFTR)?
a) facilitative transporter of glucose
b) cyclic AMP-regulated chloride channel
c) conductor of bicarbonate ions
d)stimulator of activity of a family of epithelial bicarbonate exchangers
Ans: a) facilitative transporter of glucose
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Which of the following is a product of the Calvin cycle?
a. carbon dioxide b. glucose c. oxygen d. water
The organization of _____ allows this tissue to stretch in response to physical activity
a. tissue A b. tissue B c. tissue C d. tissue D e. tissue E
Name two methods used in genetic prenatal diagnostic testing in humans
What will be an ideal response?
Garrod's information about the enzyme alteration resulting in alkaptonuria led to further elucidation of the same pathway in humans. Phenylketonuria (PKU) occurs when another enzyme in the pathway is altered or missing, resulting in a failure of phenylalanine (phe) to be metabolized to another amino acid: tyrosine. Tyrosine is an earlier substrate in the pathway altered in alkaptonuria. How might PKU affect the presence or absence of alkaptonuria?
A. Anyone with PKU is born with a predisposition to later alkaptonuria. B. Anyone with PKU must also have alkaptonuria. C. It would have no effect, because PKU occurs several steps away in the pathway. D. It would have no effect, because tyrosine is also available from the diet. E. Anyone with PKU has mild symptoms of alkaptonuria.