Practice free Biomolecules (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
If a small amount of living tissue is weighed (wet weight) and then dried to evaporate all water, the remaining material gives:
The passage describes the process: 'One weighs a small amount of a living tissue (say a leaf or liver and this is called wet weight) and dry it. All the water, evaporates. The remaining material gives dry weight.'
In the elemental analysis, which element is listed as 'very little' in the Earth's crust but 3.3% in the human body?
Table 9.1 shows that Nitrogen (N) is 'very little' in the Earth's crust and 3.3% in the human body.
Biomolecules are chemical compounds found in living organisms. Which of the following defines a biomolecule based on its origin?
The text states: 'All the carbon compounds that we get from living tissues can be called 'biomolecules'.'
The primary reason lipids are found in the acid-insoluble fraction, despite not being strictly macromolecules, is because:
The text explains: 'Cell membrane and other membranes are broken into pieces, and form vesicles which are not water soluble. Therefore, these membrane fragments in the form of vesicles get separated along with the acid insoluble pool and hence in the macromolecular fraction. Lipids are not strictly macromolecules.'
What is the primary characteristic of a competitive inhibitor?
The context states: 'When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.'
How does a competitive inhibitor primarily affect enzyme activity?
The text explains: 'Due to its close structural similarity with the substrate, the inhibitor competes with the substrate for the substrate-binding site of the enzyme.'
Which of the following is an example of competitive inhibition given in the text?
The context provides: 'e.g., inhibition of succinic dehydrogenase by malonate which closely resembles the substrate succinate in structure.'
What happens to the enzyme action when a competitive inhibitor binds to the active site?
The text states: 'Consequently, the substrate cannot bind and as a result, the enzyme action declines.'
Competitive inhibitors are often used for what purpose?
The provided information mentions: 'Such competitive inhibitors are often used in the control of bacterial pathogens.'
If an increase in substrate concentration can overcome the effect of an inhibitor, what type of inhibition is likely occurring?
Competitive inhibition can be overcome by increasing substrate concentration because the substrate will outcompete the inhibitor for the active site. While not explicitly stated to be overcome, the mechanism of direct competition implies this.
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