NEET Practice Questions (MCQs) with Answers & Solutions

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Which of the following is an example of a parasitic fungus on mustard, belonging to the Phycomycetes?

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Explanation

Albugo (the parasitic fungi on mustard) is listed as a common example of Phycomycetes.

The sexual spores called ascospores are produced endogenously in sac-like asci in which class of fungi?

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Explanation

Regarding Ascomycetes, the NCERT states, 'Sexual spores are called ascospores which are produced endogenously in sac like asci'.

Which statement is TRUE regarding the mycelium of Basidiomycetes?

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Explanation

The NCERT mentions for Basidiomycetes, 'The mycelium is branched and septate'.

Mushrooms, bracket fungi, and puffballs are common forms of which fungal class?

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Explanation

The text clearly states, 'Commonly known forms of basidiomycetes are mushrooms, bracket fungi or puffballs'.

Which class of fungi is typically characterized by the absence of asexual spores, but common vegetative reproduction by fragmentation?

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Explanation

For Basidiomycetes, it is mentioned, 'The asexual spores are generally not found, but vegetative reproduction by fragmentation is common'.

The dikaryotic stage ($n+n$) is an intervening phase that occurs during the sexual cycle of which two classes of fungi?

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Explanation

The NCERT text states, 'in other fungi (ascomycetes and basidiomycetes), an intervening dikaryotic stage (n + n, i.e., two nuclei per cell) occurs'.

Which fungi class includes obligate parasites on plants, such as Albugo?

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Explanation

Phycomycetes are described as occurring 'as obligate parasites on plants' with Albugo as an example.

Which of the following describes the folding pattern of the polypeptide chain backbone due to hydrogen bonding between $C=O$ and $-NH-$ groups of the peptide bond?

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Explanation

The context states: 'The secondary structure of protein refers to the shape in which a long polypeptide chain can exist. These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between $C=O$ and $-NH-$ groups of the peptide bond.'

The $\alpha$-helix structure of proteins is characterized by:

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Explanation

The context mentions: '$\alpha$-Helix is one of the most common ways in which a polypeptide chain forms all possible hydrogen bonds by twisting into a right handed screw (helix) with the –NH group of each amino acid residue hydrogen bonded to the C=O of an adjacent turn of the helix.'

Which type of protein structure resembles the pleated folds of drapery, caused by polypeptide chains laid side by side and held together by intermolecular hydrogen bonds?

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Explanation

The context states: 'In $\beta$-pleated sheet structure all peptide chains are stretched out to nearly maximum extension and then laid side by side which are held together by intermolecular hydrogen bonds. The structure resembles the pleated folds of drapery and therefore is known as $\beta$-pleated sheet.'

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