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Unformatted text preview: 4. Which of the following descriptions is correct? a) Nitrogen is excreted in the form of ammonia by fish. b) Urea is toxic and water insoluble. c) Uric acid is soluble, and excreted by birds. d) The form of excreted nitrogen is not related to the environment of the embryo. e) None of the above. 5. The urea cycle can be positively regulated by a) stimulation of carbamoyl phosphate synthetase I. b) stimulation of N-acetyl glutamate synthase c) increased level of glutamate d) None of the above. e) All of the above. 6. Which of the following descriptions about DNA is not correct? a) Adenine and thymine form two hydrogen bonds while guanine and cytosine form three. b) A-DNA forms right-handed helix. c) Repetition of purine-pyrimidine sequences can cause Z-DNA formation. d) a) and b) e) None of the above....
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- Winter '08
- Biochemistry, essential amino acids, following descriptions