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The double helix model of DNA by Watson and Crick exhibits its:
1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure
Subtopic: Double Helix : Watson & Crick |
74%
Level 2: 60%+
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The strands of the DNA double helix are:
| 1. | identical |
| 2. | coiled around each other |
| 3. | parallel to each other |
| 4. | complementary to each other |
Subtopic: Nucleic Acid | The DNA |
77%
Level 2: 60%+
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At each step of ascent, the helical strand of DNA turns
| 1. | 36 degree | 2. | 34 degree |
| 3. | 20 degree | 4. | 180 degree |
Subtopic: Nucleic Acid | The DNA |
77%
Level 2: 60%+
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In the absence of carbonic anhydrase in the human body, the reaction between carbon dioxide and water leading to the formation of carbonic acid:
1. Will not occur
2. Will slow down considerably
3. Will get faster
4. Will remain unaltered
Subtopic: Enzymes |
85%
Level 1: 80%+
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The substrate concentration at which the enzyme catalyzed reaction achieves ½ Vmax is its ____ value.
| 1. | Km | 2. | Kcat |
| 3. | pKa | 4. | Q10 |
Subtopic: Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
93%
Level 1: 80%+
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Enzymes that catalyze removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds are:
| 1. | Dehygdrogenases | 2. | Transferases |
| 3. | Lyases | 4. | Ligases |
Subtopic: Enzymes Classification |
77%
Level 2: 60%+
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Consider the following statements:
| I: | Glycine is the simplest amino acid, with a hydrogen atom as its side chain (R group). |
| II: | Tryptophan is an aromatic amino acid. |
| III: | Lysine is an acidic amino acid. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Different Amino Acids |
Level 4: Below 35%
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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
1. Positively charged form
2. Negatively charged form
3. Neutral form
4. Zwitter ionic form
Subtopic: Amino Acids |
94%
Level 1: 80%+
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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 |
Subtopic: Enzyme Cofactors |
81%
Level 1: 80%+
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Inulin is a:
| 1. | Disaccharide containing two galactose |
| 2. | Disaccharide containing fructose and galactose |
| 3. | Polymer of fructose |
| 4. | Polysaccharide used in microbial culture |
Subtopic: Carbohydrates |
88%
Level 1: 80%+
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