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Cell: The Unit of Life · Question 83

AIPMT 2012 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following cellular parts is correctly described ?

  1. Lysosomes - optimally active at a pH of about 8.5
  2. Centrioles - sites for active RNA synthesis
  3. Thylakoids - flattened membranous sacs forming the grana of chloroplasts
  4. Ribosomes - those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S)

Answer

(3) Thylakoids - flattened membranous sacs forming the grana of chloroplasts

Solution

As per NCERT, the stroma of the chloroplast contains a number of organised flattened membranous sacs called the thylakoids; thylakoids are arranged in stacks like piles of coins called grana.

∵ Lysosomal hydrolases are optimally active at acidic pH (about 5), centrioles form the basal bodies/spindle (not sites of RNA synthesis), and chloroplast ribosomes are smaller (70S) than cytoplasmic ones (80S), the other options are wrong.

Answer: (3)

AIPMT 2012 (Mains)

Keep practising — Cell: The Unit of Life

2

Which one of the following structures is an organelle within an organelle ?

  1. Mesosome
  2. Peroxisome
  3. Ribosome
  4. ER
AIPMT 2012 (Mains)
3

Ribosomal RNA is actively synthesized in

  1. Nucleolus
  2. Ribosomes
  3. Lysosomes
  4. Nucleoplasm
AIPMT 2012 (Prelims)
4

Select the correct statement from the following regarding cell membrane

  1. Na+ and K+ ions move across cell membrane by passive transport
  2. Lipids are arranged in bilayer with polar heads towards the inner part
  3. Proteins make up 60 to 70% of the cell membrane
  4. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
AIPMT 2012 (Prelims)
5

What is true about ribosomes ?

  1. These are self-splicing introns of some RNAs.
  2. These are found only in eukaryotic cells
  3. These are composed of ribonucleic acid and proteins
  4. The prokaryotic ribosomes are 80 S, where 'S' stands for sedimentation coefficient.
AIPMT 2012 (Prelims)
6

Which one of the following does not differ in E. coli and Chlamydomonas ?

  1. Chromosomal Organization
  2. Cell wall
  3. Ribosomes
  4. Cell membrane
AIPMT 2012 (Prelims)
7

Which one of the following is not considered as a part of the endomembrane system ?

  1. Vacuole
  2. Lysosome
  3. Golgi complex
  4. Peroxisome
AIPMT 2011 (Mains)
8

The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function. [Figure]

  1. Part (B) : Inner membrane – forms infoldings called cristae
  2. Part (C) : Cristae – possess single circular DNA molecule and ribosomes
  3. Part (A) : Matrix – major site for respiratory chain enzymes
  4. Part (D) : Outer membrane – gives rise to inner membrane by splitting
AIPMT 2011 (Mains)
9

In eubacteria, a cellular component that resembles eukaryotic cell is

  1. plasma membrane
  2. nucleus
  3. ribosomes
  4. cell wall
AIPMT 2011 (Prelims)
10

Which one of the following organisms is not a eukaryote?

  1. Paramecium caudatum
  2. Escherichia coli
  3. Euglena viridis
  4. Amoeba proteus
AIPMT 2011 (Prelims)
11

Peptide synthesis inside a cell takes place in :

  1. Chromoplast
  2. Ribosomes
  3. Chloroplast
  4. Mitochondria
AIPMT 2011 (Prelims)

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