Cell: The Unit of Life Previous Year Questions — NEET Biology

4 past-year Cell: The Unit of Life questions from NEET (Biology).

Q92 (2024)

Which one of the following is the site for active ribosomal RNA synthesis?
  1. Nucleolus
  2. Chromatin
  3. Centrosome
  4. Kinetochore
### Related Formula rRNA synthesis site = Nucleolus ### Core Logic The nucleolus is a non-membrane-bound dense structure found inside the nucleus. It is the site of active ribosomal RNA ($rRNA$) synthesis. ### Step 1: Evaluation Option (1) Nucleolus is the site for active ribosomal RNA synthesis. ### Pattern Recognition Direct NCERT recall: Active rRNA synthesis → Nucleolus. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Cell: The Unit of Life

Q148 (2024)

Non-membrane bound cell organelles found in both prokaryotic and eukaryotic cells are:
  1. Centrosomes
  2. Ribosomes
  3. Lysosomes
  4. Mitochondria
### Related Formula $\text{Universal non-membrane bound organelle} = \text{Ribosomes} \quad (70\text{S in Prokaryotes}, 80\text{S in Eukaryotes})$ ### Core Logic Ribosomes are non-membrane-bound organelles present in all living cells, including both prokaryotes (70S) and eukaryotes (80S, as well as 70S inside mitochondria and chloroplasts). Centrosomes are non-membrane bound but present only in animal eukaryotic cells. Lysosomes and mitochondria are membrane-bound organelles. ### Step 1: Conclusion Ribosomes are found in both prokaryotic and eukaryotic cells. ### Pattern Recognition Sees: "non-membrane bound organelle in both prokaryotes and eukaryotes". Shortcut: Ribosomes (present in both). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Cell: The Unit of Life

Q152 (2024)

Choose the correct statements regarding cell organelles and their inclusions. A. The endomembrane system includes Golgi complex, endoplasmic reticulum and mitochondria. B. Rough endoplasmic reticulum bears ribosomes on its surface. C. Both mitochondria and plastids have circular DNA. D. A network of microtubules, microfilaments and intermediate filaments present in the cytoplasm is called cytoskeleton. E. Mitochondrion is a single membrane-bound structure. Choose the correct answer from the options given below:
  1. C, D and E only
  2. A and B only
  3. A, B and C only
  4. B, C and D only
### Related Formula $\text{Endomembrane System} = \text{ER, Golgi, Lysosomes, Vacuoles} \quad (\text{Excludes Mitochondria, Chloroplasts, Peroxisomes})$ ### Core Logic Analysis of statements: * A (Incorrect): Endomembrane system does NOT include mitochondria or plastids. * B (Correct): RER has ribosomes attached to its outer surface. * C (Correct): Both mitochondria and plastids contain semi-autonomous double-stranded circular DNA. * D (Correct): Network of filamentous proteinaceous structures (microtubules, microfilaments, intermediate filaments) in cytoplasm is the cytoskeleton. * E (Incorrect): Mitochondria are double-membrane bound structures. ### Step 1: Conclusion Statements B, C, and D are correct. ### Pattern Recognition Sees: "Endomembrane includes mitochondria" (False) and "Mitochondria single membrane" (False). Shortcut: Eliminate options with A or E. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Cell: The Unit of Life

Q163 (2024)

Select the correct statements regarding cell membrane in eukaryotic cell. A. Membrane of human RBCs has approximately 52% protein. B. Major phospholipids are arranged in a bilayer. C. Extensions of the plasma membrane into the cell form mesosomes. D. Tails towards the inner part of lipids are hydrophobic and thus protected from aqueous medium. E. Glycocalyx is present on the outer surface of the plasma membrane. Choose the correct answer from the options given below:
  1. A, C and E only
  2. B, C and E only
  3. C, D and E only
  4. A, B and D only
### Related Formula $\text{Human RBC Membrane: } 52\% \text{ Protein} + 40\% \text{ Lipid}$ ### Core Logic Evaluating the statements for eukaryotic cell membrane: * A (Correct): Human erythrocyte membrane contains 52% protein and 40% lipids. * B (Correct): Phospholipids form a bilayer with polar heads pointing outward and hydrophobic tails inward. * C (Incorrect): Mesosomes are plasma membrane extensions in prokaryotes (bacteria), not eukaryotes. * D (Correct): Hydrophobic non-polar saturated hydrocarbon tails face inward to stay protected from the aqueous environment. * E (Incorrect): Glycocalyx is a characteristic feature of the cell envelope of prokaryotes. ### Step 1: Result Statements A, B, and D are correct. ### Pattern Recognition Sees: "mesosomes in eukaryotic cell membrane" (False). Shortcut: Mesosomes and Glycocalyx are prokaryotic features $\rightarrow$ eliminate C and E. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Cell: The Unit of Life
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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