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Medical
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Which of the following structures is not found in a prokaryotic cell ?

  • Option 1)

    Ribosome

  • Option 2)

    Mesosome

  • Option 3)

    Plasma membrane

  • Option 4)

    Nuclear envelope

 
  Ribosomes in prokaryotic cells - Ribosomes in prokaryotic cells are of 70S types - DNA in Prokaryotic cells - Usually circular;  naked and without an association with histones. - wherein Amount of DNA is comparatively low, It lies freely in the cytoplasm and is not associated with any organelle    Prokaryotic DNA lies freely in cytoplasm with no nuclear envelope   Option 1) Ribosome This is...
Medical
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Which of the following biomolecules does have a phosphodiester bond ?

  • Option 1)

    Monosaccharides in a polysaccharide

  • Option 2)

    Amino acids in a polypeptide

  • Option 3)

    Nucleic acids in a nucleotide

  • Option 4)

    Fatty acids in a diglyceride

 
  Phosphodiester Bond - The bond between a phosphate and hydroxyl group of sugar form an ester linkage, it is called phosphodiester bond. -     Nucleic Acids - Nucleic Acids like DNA, RNA contains only Nucleotides and function as genetic material.   - wherein   Nucleic acid are polymer of nucleotides joined by phosphodiester bonds Option 1) Monosaccharides in a polysaccharide This is...
Medical
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Arrange the following events of meiosis in correct sequence:

  1. Crossing over
  2. Synapsis
  3. Terminalisation of chiasmata
  4. Disappearance of nucleolus
  • Option 1)

    (b),(a),(c),(d)

  • Option 2)

    (a),(b)/(c).,(d)

  • Option 3)

    (b),(c),(d),(a)

  • Option 4)

    (b),(a),(d),(c)

 
As dicussed in Zygotene - The second stage of Prophase I. Chromosomes starts pairing together in a process called synapsis. Each paired chromosome is homologous. Synapsis is accompanied by the formation of the complex structures-synaptonemal complex.   - wherein    Termination of  chaismata (in darkness)Nucleolus dissapears Option 1) (b),(a),(c),(d) This option is correct  Option...
Medical
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Which of the following are not membrane - bound ?

  • Option 1)

    Ribosomes

  • Option 2)

    Lysosomes

  • Option 3)

    Mesosomes

  • Option 4)

    Vacuoles

 
As discussed in Ribosomes - It is a complex made up of RNA and protein and is the site for protein synthesis. - wherein Several ribosomes may attach to a single mRNA and form chains called polyribosomes or polysome.    Ribosomes are complex of RNA and protein.  Option 1) Ribosomes This option is correct  Option 2) Lysosomes This option is incorrect  Option 3) Mesosomes This option is...
Medical
257 Views   |  

Match the columns and identify the correct option.

                 Column I                                        Column II

(a)       Thylakoids                       (i)               Disc-shaped sacs in Golgi apparatus

(b)       Cristae                              (ii)              Condensed structure of DNA

(c)        Cisternae                        (iii)              Flat membranous sacs in stroma

(d)       Chromatin                        (iv)              Infoldings in mitochondria

(a)       (b)       (c)         (d)

  • Option 1)

    (iii)         (iv)          (i)            (ii)

  • Option 2)

    (iii)         (i)           (iv)           (ii)

  • Option 3)

    (iii)         (iv)         (ii)            (i)

  • Option 4)

    (iv)         (iii)         (i)            (ii)

 
As learnt in Structure of Nucleus - The interphase nucleus (nucleus of a cell when it is not dividing) has highly extended and elaborate nucleoprotein fibres called chromatin, nucleus matrix and one or more spherical bodies called nucleoli. The nuclear matrix or the nucleoplasm contains nucleolus and chromatin.   - wherein    And,   Chloroplasts - Chloroplasts contains chlorophyll and...
Medical
113 Views   |  

Cellular organelles with membranes are:

  • Option 1)

    chromosomes, ribosomes and endoplasmic reticulum

  • Option 2)

    endoplasmic reticulum, ribosomes and nuclei

  • Option 3)

    lysosomes, Golgi apparatus and mitochondria

  • Option 4)

    nuclei, ribosomes and mitochondria

 
As discussed in Mitochondria - Each mitochondria is a double membrane bound structure with the outer membrane and the inner membrane dividing its lumen distinctly into two aqueous compartments.   - wherein It is the site of aerobic respiration. It produces cellular energy in the form of ATP, hence called as 'power house' of the cell.     And,   Cell organelles in eukaryotic cell - Mitochondria...
Medical
103 Views   |  

Cell wall is absent in :

  • Option 1)

    Funaria

  • Option 2)

    Mycoplasma

  • Option 3)

    Nostoc

  • Option 4)

    Aspergillus

 
As discussed in Prokaryotic Cells - These are mainly represented by bacteria, blue-green algae, mycoplasma and PPLO (Pleuro Pneumonia Like Organisms). -    Mycoplasm are prokaryotes and they lack cell wall. Option 1) Funaria This option is incorrect. Option 2) Mycoplasma This option is correct. Option 3) Nostoc This option is incorrect. Option 4) Aspergillus This option is incorrect.
Medical
176 Views   |  

A protoplast is a cell:

  • Option 1)

    without nucleus

  • Option 2)

    undergoing division

  • Option 3)

    without cell wall

  • Option 4)

    without plasma membrane

 
As discussed in Protoplasm - Refers to the substance of which cell is made and includes all parts of the cell. It metabolizes and self perpetuates hence,it is a living substance - wherein It metabolizes and self perpetuates hence, it is a living substance.    Protoplasm includes all parts of the cell, nut protoplast is the protoplasm whose cell wall has been removed. Option 1) without...
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