Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Based on the provided information, Aschelminthes can be both:
The NCERT summary explicitly states: 'Aschelminthes are pseudocoelomates and include parasitic as well as non-parasitic roundworms.'
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.
Which nematode species is specifically mentioned in the context as infecting tobacco plants and causing a significant reduction in yield?
The text explicitly states: 'A nematode Meloidegyne incognitia infects the roots of tobacco plants and causes a great reduction in yield.'
RNA interference (RNAi) is described as a method of cellular defense common to:
The context mentions: 'RNAi takes place in all eukaryotic organisms as a method of cellular defense.'
What is the primary consequence of specific mRNA silencing in the nematode Meloidogyne incognitia when it attempts to infect a transgenic host plant producing interfering RNA?
The text states: 'The consequence was that the parasite could not survive in a transgenic host expressing specific interfering RNA. The transgenic plant therefore got itself protected from the parasite.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.