Cell Division and New Cell Formation — NEET Biology
📚 Practice ConceptNew cells generate from (a) bacterial fermentation (b) regeneration of old cells (c) pre-existing cells (d) abiotic materials
Which of the following statements concerning the surface structures and modifications of bacterial cells are correct? S1: Fimbriae are small, bristle-like fibers that assist bacteria in attaching to host tissues and surfaces like rocks in streams. S2: Flagella are surface structures primarily responsible for motility, while pili are elongated tubular structures involved in attachment but not motility. S3: The capsule, a thick and tough glycocalyx, provides structural support and determines the shape of the bacterial cell. S4: Mesosomes are internal, membrane-bound organelles that contain pigments in photosynthetic prokaryotes like cyanobacteria. S5: Ribosomes in prokaryotes are 80S type and are primarily involved in storage of reserve materials.
View solution & NCERT explanation
Correct answer: A — S1 and S2 are correct
This question evaluates the understanding of various surface structures and modifications in bacteria. S1: NCERT states that fimbriae are small bristle-like fibres that help attach bacteria to rocks in streams and also to host tissues. So, S1 is correct. S2: Flagella are thin filamentous extensions responsible for bacterial motility. Pili are elongated tubular structures that are surface structures but do not play a role in motility, distinguishing them from flagella. So, S2 is correct. S3: The cell wall determines the shape of the cell and provides strong structural support to prevent bursting or collapsing. The capsule, which is a thick glycocalyx, is part of the protective cell envelope but is not primarily responsible for determining cell shape or preventing bursting. So, S3 is incorrect. S4: Mesosomes are specialized membranous infoldings of the plasma membrane, not internal membrane-bound organelles. Chromatophores are membranous extensions containing pigments in some prokaryotes. So, S4 is incorrect. S5: Prokaryotic ribosomes are 70S type (composed of 50S and 30S subunits), not 80S. Ribosomes are the site of protein synthesis, while reserve materials are stored in inclusion bodies. So, S5 is incorrect. Therefore, only statements S1 and S2 are correct.
What does NCERT say about New cells generate from?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.