12 questions with answers and explanations
Multiple-choice questions at NCERT Class 11 level, written as sample content for the Quizly demo course — not past NEET paper questions. Try each one, then open Show answer for the correct option and a one-line explanation.
Answer: B. Lysosome
Lysosomes carry hydrolytic enzymes. If the lysosomal membrane ruptures, those enzymes digest the cell's own contents — hence the name.
Answer: A. Nucleolus
The nucleolus is the site of rRNA transcription and of ribosome subunit assembly. It is not membrane-bound.
Answer: C. Lysosome
Mitochondria, chloroplasts and the nucleus are all double-membrane structures. Lysosomes, the Golgi body and the ER have a single membrane.
Answer: B. Singer and Nicolson
Singer and Nicolson (1972) described the membrane as a quasi-fluid lipid bilayer with proteins embedded in a mosaic pattern.
Answer: B. Osmosis
Osmosis is the passive movement of the solvent (water) down its own potential gradient across a semi-permeable membrane. No ATP is spent.
Answer: B. Peptide bond
A peptide bond is formed between the carboxyl group of one amino acid and the amino group of the next, with the loss of a water molecule.
Answer: C. Glucose
Glucose has a free aldehyde group, so it reduces Benedict's and Fehling's reagents. In sucrose both anomeric carbons are locked in the glycosidic bond.
Answer: B. Metaphase
At metaphase the chromosomes line up on the metaphase plate with their centromeres attached to spindle fibres from both poles.
Answer: B. S phase
The S (synthesis) phase of interphase is when DNA content doubles from 2C to 4C. The chromosome number stays the same.
Answer: B. Anaphase
Anaphase begins with the splitting of the centromere; the two sister chromatids become independent daughter chromosomes and are pulled apart.
Answer: C. Pachytene
Recombination nodules appear at pachytene and the enzyme recombinase carries out crossing over between non-sister chromatids of a bivalent.
Answer: B. 23
Meiosis I is the reductional division: 46 chromosomes (23 bivalents) are reduced to 23 chromosomes, each still made of two chromatids.
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