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Cell: The Unit of Life · Question 101

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following has its own DNA?

  1. Dictyosome
  2. Mitochondria
  3. Peroxisome
  4. Lysosome

Answer

(2) Mitochondria

Solution

As per NCERT, the mitochondrial matrix possesses a single circular DNA molecule, a few RNA molecules, ribosomes (70S) and the components required for the synthesis of proteins.

Dictyosomes (Golgi), peroxisomes and lysosomes do not have their own DNA.

∴ Mitochondria have their own DNA (semi-autonomous organelles).

Answer: (2)

AIPMT 2010 (Prelims)

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2

Which one of the following structures between two adjacent cells is an effective transport pathway?

  1. Endoplasmic reticulum
  2. Plasmodesmata
  3. Plasmalemma
  4. Plastoquinones
AIPMT 2010 (Prelims)
3

Middle lamella is composed mainly of :

  1. Calcium pectate
  2. Phosphoglycerides
  3. Muramic acid
  4. Hemicellulose
AIPMT 2009
4

Cytoskeleton is made up of :

  1. Cellulose microfibrils
  2. Proteinaceous filaments
  3. Calcium carbonate granules
  4. Callose deposits
AIPMT 2009
5

Plasmodesmata are :

  1. Locomotory structures
  2. Connection between adjacent cells
  3. Membranes connecting the nucleus with plasmalemma
  4. Lignified cemented layers between cells
AIPMT 2009
6

Polysome is formed by

  1. several ribosomes attached to a single mRNA
  2. many ribosomes attached to a strand of endoplasmic reticulum
  3. a ribosome with several subunits
  4. ribosomes attached to each other in a linear arrangement
AIPMT 2008
7

In germinating seeds fatty acids are degraded exclusively in the:

  1. proplastids
  2. peroxisomes
  3. glyoxysomes
  4. mitochondria
AIPMT 2008
8

Vacuole in a plant cell:

  1. is membrane-bound and contains storage proteins and lipids
  2. is membrane-bound and contains water and excretory substances
  3. lacks membrane and contains air
  4. lacks membrane and contains water and excretory substances
AIPMT 2008
9

The two sub-units of ribosome remain united at a critical ion level of:

  1. magnesium
  2. manganese
  3. calcium
  4. copper
AIPMT 2008
10

Keeping in view the "fluid mosaic model" for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?

  1. Both lipids and proteins can flip-flop
  2. While lipids can rarely flip-flop proteins cannot
  3. While proteins can flip-flop, lipids cannot
  4. neither lipids, nor proteins can flip-flop
AIPMT 2008
11

Which one of the following is not a constituent of cell membrane?

  1. Glycolipids
  2. Proline
  3. Phospholipids
  4. Cholesterol
AIPMT 2007

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