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Cell: The Unit of Life · Question 117

AIPMT 2005MCQEasy📈 Topic in 88% papers+4−1
1

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is -

  1. Mitochondria
  2. Endoplasmic Reticulum
  3. Chloroplast
  4. Lysosome

Answer

(2) Endoplasmic Reticulum

Solution

As per NCERT, the rough endoplasmic reticulum (RER) bears ribosomes and is actively involved in protein synthesis and secretion; the newly made proteins enter the ER lumen, where they are folded and modified, and are then packed into vesicles and routed towards the Golgi apparatus, lysosomes, plasma membrane or outside the cell.

∵ Mitochondria and chloroplasts are energy organelles and lysosomes are digestive vesicles, none of them routes proteins.

∴ Among the given organelles, the endoplasmic reticulum is the main one involved in modification and routing of newly synthesized proteins.

Answer: (2)

AIPMT 2005

Keep practising — Cell: The Unit of Life

2

In chloroplasts, chlorophyll is present in the :-

  1. Outer membrane
  2. Inner membrane
  3. Thylakoids
  4. Stroma
AIPMT 2004
3

Chromosomes in a bacterial cell can be 1–3 in number and

  1. are always circular
  2. are always linear
  3. can be either circular or linear, but never both within the same cell
  4. can be circular as well as linear within the same cell.
AIPMT 2003
4

In bacteria, plasmid is

  1. extra chromosomal material
  2. main DNA
  3. non functional DNA
  4. repetitive gene.
AIPMT 2002
5

Ribosomes are produced in:

  1. Mitochondria
  2. Golgi body
  3. Nucleolus
  4. Cytoplasm
AIPMT 2002
6

In fluid mosaic model of plasma membrane

  1. Phospholipids form a bimolecular layer in middle part
  2. Upper layer is non-polar and hydrophilic
  3. Proteins form a middle layer
  4. Polar layer is hydrophobic
AIPMT 2002
7

Difference in gram positive and gram negative bacteria is due to

  1. cell wall
  2. cell membrane
  3. ribosome
  4. cytoplasm
AIPMT 2001
8

Element necessary for the middle lamella is

  1. K
  2. Cu
  3. Ca
  4. Zn
AIPMT 2001
9

Microtubules are absent in:

  1. Spindle fibres
  2. Mitochondria
  3. Centriole
  4. Flagella
AIPMT 2001
10

Spindle fibres unite with which structure of chromosomes?

  1. Chromocentre
  2. Chromomere
  3. Kinetochore
  4. Centriole
AIPMT 2000
11

Lysosome contains:

  1. Reductive enzymes
  2. Oxidative enzymes
  3. Anabolic enzymes
  4. Hydrolytic enzymes
AIPMT 2000

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