Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which inorganic constituent is represented by the formula $PO_4^{3-}$ in living tissues?
Table 9.2 lists 'Compounds' and includes '$PO_4^{3-}$' alongside '$SO_4^{2-}$', indicating that $PO_4^{3-}$ represents phosphate.
The property that distinguishes primary metabolites from secondary metabolites is that primary metabolites:
The text states: 'While primary metabolites have identifiable functions and play known roles in normal physiological processes, we do not at the moment, understand the role or functions of all the ‘secondary metabolites’ in host organisms.'
What is the percentage by weight of Oxygen (O) in the human body according to elemental analysis data?
Table 9.1, 'A Comparison of Elements Present in Non-living and Living Matter', shows Oxygen (O) in the Human body as 65.0%.
The acid-insoluble fraction is composed of four main types of organic compounds including proteins, nucleic acids, polysaccharides, and:
The context states: 'The acid insoluble fraction, has only four types of organic compounds i.e., proteins, nucleic acids, polysaccharides and lipids.'
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.'
Bt toxin, once activated in the insect gut, binds to the surface of which specific type of cells?
According to the provided text, 'The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.'
Which of the following insect orders is NOT explicitly mentioned as being targeted by some strains of Bacillus thuringiensis toxin?
The text states that Bt toxin kills 'lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes)'. Hymenopterans are not mentioned.
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