Term
| In nitrogen fixation, atmospheric nitrogen___is chemically changed to ___. |
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Term
| Nitrogen fixation is the conversion of ___ |
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| Nitrogen fixation is carried out by |
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| Nitrogen fixation cycle has these four steps: |
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Definition
| fixation of atmospheirc nitrogen to ammonia; fixation of atmospheric nitrogen into nitrate; nitrification of soil nitrate into ammonia; denitrification of nitrogen oxides to gaseous nitrogen |
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Term
| The nitrogen-fixing enzyme system, nitrogenase, is found exclusively in... |
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Term
| How many ATP are required for the production of one ammonia molecule (NH3) from one nitrogen molecule (N2)? |
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| What is not a component of the nitrogenase complex? |
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| Nitrogen fixation cannot be accomplished by plants directly, rather it is done by bacteria or other microorganisms that live on the plants. TRUE/FALSE |
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Term
| The conversion of glutamate to glutamine is catalyzed by glutamine synthetase requires ATP. TRUE/FALSE |
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Definition
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Term
| A metabolic intermediate that is not a precursor for an amino acid family is... |
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Definition
| glyceraldehyde-3-phosphate |
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Term
| Which amino acid does NOT use glutamic acid as a precursor? |
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Definition
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Term
| The serine family of amino acids includes synthesis of all the following amino acids: |
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Definition
| serine; glycine; cysteine |
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Term
| In animals, the synthesis of cysteine does NOT involve... |
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Definition
| the addition of a carbon group to glycine. |
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Term
| Isoleucine, leucine, and valine are all formed from the same amino acid root, aspartic acid. TRUE/FALSE |
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Term
| Essential amino acids cannot be synthesized within the human body. TRUE/FALSE |
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Term
| Some amino acids can only be made in small quantities in humans and must be supplemented in the diet in children or during repair of injured tissue. TRUE/FALSE |
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Term
| Cereals are fortified with lysine, since grain foods are naturally low in the essential amino acids. TRUE/FALSE |
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Term
| Executives in the food industry tend to market a product as "high in protein", since they have added a few essential amino acids. Technically, is their claim correct? |
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Term
| In the urea cycle which molecule, that is synthesized in the cytosol, meets with the carbamoyl phosphate, which is made in the mitochondrial matrix, for subsequent reactions. |
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Definition
| is only partially an essential amino acid, since it is made in the urea cycle. |
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Term
| The urea cycle is linked to the citric acid cycle by the cleavage of |
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Term
| Which amino acid is not an intermediate in the urea cycle? Arg, citrulline, ornithine, lysine |
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Term
| Which two amino acids are key to the transfers of amino groups during breakdown and synthesis of amino acids? |
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Term
| High protein diets in humans result in the following: |
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Definition
| activation of nitrogen metabolism and activation of urea cycle |
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Term
| Which of the following amino acids is NOT glucogenic? glycine; alanine; aspartic acid; leucine |
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Term
| Mammals produce this/these as the major nitrogen waste products. |
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Definition
| Urea, Uric acid, and ammonia |
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Term
| Since nitrogen metabolism depends on the organism's availability of water, nitrogen waste is predominantly removed from the body by: |
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Term
| Would you recommend a high protein diet for the long distance runner during a race, since metabolism would depends on the availability of water? |
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Term
| If an amino acid's degradation pathway leads to alpha-ketoglutarate, is it glucogenic? |
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Definition
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Term
| The two nitrogens to make urea in the urea cycle arise directly from: |
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Definition
| the nitrogens from carbamoyl phosphate and aspartic acid |
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Term
| Which amino acid biosynthesis is associated with nucleotide biosynthesis? |
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Definition
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Term
| The reduction of atmospheric N2 to NH3 occurs on which subunit of nitrogenase? |
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Definition
| molybdenum-iron-sulfur complex |
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