BCH100 WH_7 09W_1

BCH100 WH_7 09W_1 - 4. Which of the following descriptions...

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ELEMENTAL BIOCHEMISTRY 100 WINTER 2009 WEEKLY HOMEWORK #7, Friday, February 23, 2009 1 point each, 6 points total 1. Which of the following descriptions is correct? a) Denitrifying bacteria can fix N 2 in atmosphere b) Lightning is not involved in nitrogen fixation. c) Nitrogen fixation requires a relatively small amount of energy. d) a) and b) e) None of the above. 2. Which of the following can be a carrier for one carbon transfer? a) Tetrahydrofolate b) Biotin c) S-adenosylmethionine (SAM) d) All of the above. e) None of the above. 3. Which of the following is not true for describing essential amino acids? a) Essential amino acids include lysine and methionine. b) Histidine is essential for both children and adults. c) Glutamine is nonessential amino acid. d) Arginine can be synthesized by mammals. e) None of the above.
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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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This note was uploaded on 02/25/2009 for the course BCH 100 taught by Professor Staff during the Winter '08 term at UC Riverside.

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BCH100 WH_7 09W_1 - 4. Which of the following descriptions...

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