Many organic substances are negatively charged e.g., acetic acid, while others are positively charged e.g., ammonium ion. An amino acid under certain conditions would have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called
1. Positively charged form | 2. Negatively charged form |
3. Neutral form | 4. Zwitter ionic form |
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Sugars are technically called carbohydrates, referring to the fact that their formulae are only multiples of C(H2O). Hexose therefore has six carbons, twelve hydrogen and six oxygen atoms. Glucose is a hexose. Choose from among the following another hexose.
1. | Fructose | 2. | Erythrose |
3. | Ribulose | 4. | Ribose |
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When we homogenize any tissues in an acid the acid soluble pool represents
1. | Cytoplasm | 2. | Cell membrane |
3. | Nucleus | 4. | Mitochondria |
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What level of protein organization structure explains the 3-D shape of an enzyme?
1. primary structure | 2. tertiary structure |
3. secondary structure | 4. quaternary structure |
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The graph shown below shows the effect of a certain factor on the rate of a reaction catalyzed by an enzyme. The X-axis would show the said factor and that will be:
1. substrate concentration | 2. pH |
3. enzyme concentration | 4. temperature |
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If an active-site directed inhibitor is present in the medium, the curve that will represent the progress of the chemical reaction will be shown by the letter:
1. D | 2. C |
3. A | 4. B |
A change in an amino acid located distantly from the active site of an enzyme can affect the specificity of the enzyme towards its substrate by:
1. making the enzyme unstable
2. cause a relocation of the enzyme within a cell
3. changing the shape of the protein
4. changing the optimum pH and temperature values for the enzyme
An amino acid that is negative charged amongst the following will be:
1. Glutamic acid | 2. Lysine |
3. Arginine | 4. Histidine |
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The metal ion that acts as a co-factor for both alcohol dehydrogenase and carbonic anhydrase is:
1. | Magnesium | 2. | Iron |
3. | Zinc | 4. | Nickel |
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The living state can be best described as a:
1. non equilibrium steady state
2. non equilibrium non steady state
3. equilibrium non steady state
4. equilibrium steady state
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