The only gene that has been positively identified with the onset of Alzheimer disease encodes a protein
that ___________________.
A. is involved in cholesterol metabolism
B. breaks down neurotransmitters
C. maintains the health of striatum cells
D. attaches amino acids to tRNA molecules
E. breaks down fatty deposits around neurons
A
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A mutation of a segmentation gene can result in all of the following EXCEPT
A. duplication of body parts B. missing body regions C. replacement of one body part with another D. altered expression of homeotic genes E. incorrect establishment of body axes
HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
What is the correct order of largest to smallest respiratory structures?
a. Bronchiole - alveolar duct - alveoli b. Alveoli - alveolar duct - bronchiole c. Alveoli - bronchiole - alveolar duct d. Alveolar duct - alveoli - bronchiole e. Bronchiole - alveoli - alveolar duct
The oxygen released in photosynthesis comes from ____.
A. carbon dioxide
B. glucose
C. ribulose bisphosphate
D. water
E. atmospheric oxygen