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Cell: The Unit of Life · Question 119

AIPMT 2003MCQMedium📈 Topic in 50% papers+4−1
1

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.

Answer

(1) are always circular

Solution

As per NCERT, the genetic material of a prokaryotic (bacterial) cell is basically naked and not enveloped by a nuclear membrane; the genomic DNA is the single chromosome, i.e. circular DNA.

⇒ Bacterial chromosomes (and plasmids) are described as circular DNA molecules.

∴ Chromosomes in a bacterial cell are always circular.

Answer: (1)

AIPMT 2003

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2

In bacteria, plasmid is

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

Ribosomes are produced in:

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

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
5

Difference in gram positive and gram negative bacteria is due to

  1. cell wall
  2. cell membrane
  3. ribosome
  4. cytoplasm
AIPMT 2001
6

Element necessary for the middle lamella is

  1. K
  2. Cu
  3. Ca
  4. Zn
AIPMT 2001
7

Microtubules are absent in:

  1. Spindle fibres
  2. Mitochondria
  3. Centriole
  4. Flagella
AIPMT 2001
8

Spindle fibres unite with which structure of chromosomes?

  1. Chromocentre
  2. Chromomere
  3. Kinetochore
  4. Centriole
AIPMT 2000
9

Lysosome contains:

  1. Reductive enzymes
  2. Oxidative enzymes
  3. Anabolic enzymes
  4. Hydrolytic enzymes
AIPMT 2000
10

Which of the following ribosomes are engaged in protein synthesis in animal cell?

  1. Ribosomes of only nucleolus and cytosol
  2. Ribosomes which occur on nuclear membrane and E.R.
  3. Ribosomes of only mitochondria and cytosol
  4. Ribosomes of only cytosol
AIPMT 2000
11

Function of telomeres in nucleus is

  1. To seal the ends of chromosome
  2. Poleward movement
  3. To recognize the homologous chromosome
  4. To initiate the RNA synthesis
AIPMT 2000

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