Basic unit of a nucleic acid is
1. pentose sugar
2. Phosphoric acid
3. Nucleotide
4. All of these
Subtopic: Nucleic Acid |
52%
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Which of the following statements is incorrect?
1. Lipids are strictly macromolecules
2. Palmitic acid has 16 carbons including carboxyl carbon
3. Oils have low melting point and hence remain as liquids in winters
4. Arachidonic acid is an unsaturated fatty acid
1. Lipids are strictly macromolecules
2. Palmitic acid has 16 carbons including carboxyl carbon
3. Oils have low melting point and hence remain as liquids in winters
4. Arachidonic acid is an unsaturated fatty acid
Subtopic: Introduction |
74%
From NCERT
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Which one is the correct base pairing for DNA molecules?
1. Cytosine - Uracil
2. Thymine - Guanine
3. Thiamine - Adenine
4. Cytosine - Guanine
1. Cytosine - Uracil
2. Thymine - Guanine
3. Thiamine - Adenine
4. Cytosine - Guanine
Subtopic: Nucleic Acid |
59%
From NCERT
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DNA resembles RNA as both have
1. Ability to replicate
2. Similar sugars
3. Similar pyrimidine bases
4. Polymer of nucleotides
1. Ability to replicate
2. Similar sugars
3. Similar pyrimidine bases
4. Polymer of nucleotides
Subtopic: Nucleic Acid |
60%
From NCERT
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On hydrolysis, a nucleoside would not yield
1. purines
2. Pyrimidine
3. Pentose sugar
4. Phosphoric acid
1. purines
2. Pyrimidine
3. Pentose sugar
4. Phosphoric acid
Subtopic: Nucleic Acid |
70%
From NCERT
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Which of the following statements in incorrect?
1. Backbone of DNA is formed by sugar-phosphate-sugar chain
2. Nucleic acids are present in acid soluble fraction of any living tissue
3. DNA and RNA function as genetic material
4. There are three hydrogen bonds between G and C in DNA molecule
1. Backbone of DNA is formed by sugar-phosphate-sugar chain
2. Nucleic acids are present in acid soluble fraction of any living tissue
3. DNA and RNA function as genetic material
4. There are three hydrogen bonds between G and C in DNA molecule
Subtopic: Element Analysis | The DNA |
70%
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Which of the following is not a salient feature of B-DNA?
1. One full turn of helical strand involves 10 base pairs
2. Pitch of helix would be 34 A
3. Diameter of double helix would be 20 Å
4. DNA with left-handed coiling
1. One full turn of helical strand involves 10 base pairs
2. Pitch of helix would be 34 A
3. Diameter of double helix would be 20 Å
4. DNA with left-handed coiling
Subtopic: The DNA |
64%
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All the following statements are correct about enzymes, but one is wrong. Select the incorrect statement.
1. Almost all enzymes are proteins
2. There are some nucleic acids which behave like enzymes and are called ribozymes
3. Enzymes obtained from thermophilic organisms retain their catalytic power even at high temperatures
up to 80-90oC
4. Ribozyme was discovered by Altman et al.
1. Almost all enzymes are proteins
2. There are some nucleic acids which behave like enzymes and are called ribozymes
3. Enzymes obtained from thermophilic organisms retain their catalytic power even at high temperatures
up to 80-90oC
4. Ribozyme was discovered by Altman et al.
Subtopic: Enzymes |
68%
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Study the reaction given below
In absence of any enzyme this reaction is very slow, with 200 molecules of \(H_2CO_3\) being formed in an hour. In presence of enzyme the reaction speeds up dramatically with about 600,000 molecules formed every second. Name the enzyme which has accelerated up the reaction by 10 million times.
1. Ribozyme
2. Carbonic anhydrase
3. Catalase
4. Peroxidase
In absence of any enzyme this reaction is very slow, with 200 molecules of \(H_2CO_3\) being formed in an hour. In presence of enzyme the reaction speeds up dramatically with about 600,000 molecules formed every second. Name the enzyme which has accelerated up the reaction by 10 million times.
1. Ribozyme
2. Carbonic anhydrase
3. Catalase
4. Peroxidase
Subtopic: DYNAMIC STATE OF BODY CONSTITUENTS – CONCEPT OF METABOLISM (OLD NCERT) | METABOLIC BASIS FOR LIVING (OLD NCERT) |
85%
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Which of the following is not an example of competitive inhibition?
1. Inhibition of succinic dehydrogenase by malonate
2. Sulpha drugs used to control bacterial pathrogens
3. Inhibition of alcohol dehydrogenase by ethanol in methanol poisoning
4. Inhibition of cytochrome oxidase by cyanide
1. Inhibition of succinic dehydrogenase by malonate
2. Sulpha drugs used to control bacterial pathrogens
3. Inhibition of alcohol dehydrogenase by ethanol in methanol poisoning
4. Inhibition of cytochrome oxidase by cyanide
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
53%
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