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Cell: The Unit of Life · Question 86

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

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

Answer

(4) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Solution

(1) Na+/K+ ions are transported against the concentration gradient by the Na+/K+ pump, i.e., active transport (uses ATP). Incorrect.

(2) As per NCERT, lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part. Incorrect.

(3) In the human RBC membrane, approximately 52% protein and 40% lipids are present. Incorrect.

(4) As per NCERT, an improved model of the structure of the cell membrane was proposed by Singer and Nicolson (1972), widely accepted as the fluid mosaic model. Correct.

Answer: (4)

AIPMT 2012 (Prelims)

Keep practising — Cell: The Unit of Life

2

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)
3

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)
4

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)
5

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)
6

In eubacteria, a cellular component that resembles eukaryotic cell is

  1. plasma membrane
  2. nucleus
  3. ribosomes
  4. cell wall
AIPMT 2011 (Prelims)
7

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)
8

Peptide synthesis inside a cell takes place in :

  1. Chromoplast
  2. Ribosomes
  3. Chloroplast
  4. Mitochondria
AIPMT 2011 (Prelims)
9

Important site for formation of glycoproteins and glycolipids is :

  1. Plastid
  2. Lysosome
  3. Golgi apparatus
  4. Vacuole
AIPMT 2011 (Prelims)
10

An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called -

  1. Cytoskeleton
  2. Endoplasmic Reticulum
  3. Thylakoid
  4. Plasmalemma
AIPMT 2010 (Mains)
11

Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with – [Figure] Components : (i) Cristae of mitochondria (ii) Inner membrane of mitochondria (iii) Cytoplasm (iv) Smooth endoplasmic reticulum (v) Rough endoplasmic reticulum (vi) Mitochondrial matrix (vii) Cell vacuole (viii) Nucleus The correct components are :

  1. (A) (v), (B) (iv), (C) (viii), (D) (iii)
  2. (A) (i), (B) (iv), (C) (viii), (D) (vi)
  3. (A) (v), (B) (i), (C) (iii), (D) (ii)
  4. (A) (vi), (B) (v), (C) (iv), (D) (vii)
AIPMT 2010 (Mains)

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