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Which of the following statements is not correct ?

  • Option 1)

    Lysosomes have numerous hydrolytic enzymes.

  • Option 2)

    The hydrolytic enzymes of lysosomes are active under acidic pH.

  • Option 3)

    Lysosomes are membrane bound structures.

  • Option 4)

    Lysosomes are formed by the process of packaging in the endoplasmic reticulum.

And 3

Which of the following statements regarding mitochondria is incorrect ?

  • Option 1)

    Outer membrane is permeable to monomers of carbohydrates, fats and proteins.

  • Option 2)

    Enzymes of electron transport are embedded in outer membrane.

  • Option 3)

    Inner membrane is convoluted with infoldings.

  • Option 4)

    Mitochondrial matrix contains single circular DNA molecule and ribosomes.

answer 2 is correct

The concept of " Omnis cellula -e-cellula" regarding cell division was first proposed by:

 

  • Option 1)

    Rudolf Virchow 

  • Option 2)

    Theodore Schwann

  • Option 3)

    Schleiden

  • Option 4)

    Aristotle

  Cell Theory - Cell theory states that all living matter, from the simplest of unicellular organisms to every complex higher plants and animals, is composed of cells and each cell can act independently but functions as an inetgral part of complete organism -       Rudolf Virchow proposed the concept of " Omnis cellula -e-cellula" which means that the new cells arise from the pre - existing...

Which of the following pair of organelles does not contain DNA?

 

  • Option 1)

    Mitochondria and Lysosomes 

  • Option 2)

    Chloroplast and Vacuole 

  • Option 3)

    Lysosomes and Vacuoles 

  • Option 4)

    Nuclear envelope and Mitochondria 

  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.     Nucleus, Mitochondria and Plastids contain DNA. Mitochondria and...

The shorter and longer arm of a sub-metacentric chromosomes are referred as:

 

  • Option 1)

    s- arm and l-arm respectively

  • Option 2)

    p - arm and q- arm respectively

  • Option 3)

    q- arm and p - arm respectively

  • Option 4)

    m - arm and n - arm respectively

  Types of chromosomes - Based on the position of centromere, the chromosomes can be classified into four types: 1) Metacentric chromosome- middle centromere forming two equal arms. 2) Sub-metacentric- centromere slightly away from the center. 3)Acrocentric- centromere is situated close to its end  4)Telocentric- terminal centromere   - wherein     In submetacentric chromosomes the...

Correct sequence of phases in cell cycle is

  • Option 1)

    M → G1→G2 → S

  • Option 2)

    G1 → G2 → S → M

  • Option 3)

    S→ G1 → G2 → M

  • Option 4)

    G1 → S → G2 → M

  Interphase - Interphase represents the phase between two successive M-phases. - wherein The interphase lasts more than 95% of the duration of cell cycle, also called as resting phase.         The cell cycle is divided into two phases interphase and M- phase. During interphase cell grows and make a copy of its DNA. While during M phase , cell seprates its DNA into two sets and divides its...

____________ statements:

A. Coenzymes or metal ion that is tightly bound to enzymes protein is called prosthetic group.

B. A complete catalytic active enzymes with its bound prosthetic group is called apoenzyme.

 

  • Option 1)

    Both A and B are true

  • Option 2)

    A is true but B is false

  • Option 3)

    Both A and B are false

  • Option 4)

    A is false but B is true

  Apoenzyme - The inactive protein part of an enzyme without a cofactor is called the apoenzyme.  -       Prosthetic group which can be a coenzymes or metal ion and is attached to enzymes protein. On other hand apoenzymes is an inactive enzymes is an inactive enzymes whose actival is dependent on binding of an inorganic cofactor. Thus statement A is correct and B is incorrect.  Option 1)Both...

Concanavalin A is:

  • Option 1)

    an alkaloid

  • Option 2)

    an essential oil 

  • Option 3)

    a lectin

  • Option 4)

    a pigment 

 
  Extracellular coats - mucoprotein or glycoprotein - A glycocalyx or mucous coat of protein and mucopolysaccharide, cover epithelial lining of gastrointestinal tract. -       Concanavalin A is a lectin, i.e, carbohydrates biding protein which is extracted from Jack - bean. It binds specifically to sugars , glycoproteins and glycolipids.   Option 1) an alkaloid Option 2) an essential...

Cells in G0 phase:

 

  • Option 1)

    exit the cell cycle

  • Option 2)

    enter the cell cycle

  • Option 3)

    suspend the cell cycle

  • Option 4)

    terminate the cell cycle

  Quiescent Stage (Go) - Few cells that do not divide exit G phase to enter an inactive stage called -     The G0 phase is a period in the cell cycle in which cells exit the cell cycle and enters a quiscent state. In this stage cells neither divide nor prepare to divide.   Option 1) exit the cell cycle Option 2) enter the cell cycle Option 3) suspend the cell cycle Option 4) terminate the cell cycle

DNA precipitation out of mixture of biomolecules can be achieved by treatment with:

 

  • Option 1)

    Isopropanol

  • Option 2)

    Chilled ethanol

  • Option 3)

    Methanol at room temperature

  • Option 4)

    Chilled chloroform

  DNA - It is a polynucleotide, in which the sugar is found as deoxyribose. Hence, the name Deoxyribonucleic acid. (DNA) -       In a mixture of biomolecules, DNA can be precipitated by adding chilled ethanol, RNA by adding isopropanal and protein is not precipitated but is recovered from supernatent.   Option 1) Isopropanol Option 2) Chilled ethanol Option 3) Methanol at room...

Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with 

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

  • Option 1)

    A - (i) , B-(iv) , C-(viii) , D-(vi)

  • Option 2)

    A-(vi), B-(v),C-(iv), D-(vii)

  • Option 3)

    A-(v), B-(i), C-(iii), D-(ii)

  • Option 4)

    A-(v), B-(iv) ,C-(viii), D-(iii)

 
Option 1) A - (i) , B-(iv) , C-(viii) , D-(vi) Option 2) A-(vi), B-(v),C-(iv), D-(vii) Option 3) A-(v), B-(i), C-(iii), D-(ii) Option 4) A-(v), B-(iv) ,C-(viii), D-(iii)

select the wrong statement

  • Option 1)

    Bacterial cell wall is made up of peptidoglycan

  • Option 2)

    Pili and fimbriae are mainly involved in motility of bacterial cells

  • Option 3)

    Cyanobacteria lack flagellated cells.

  • Option 4)

    Mycoplasma is a wall-less microorganism

 
Option 1) Bacterial cell wall is made up of peptidoglycan Option 2) Pili and fimbriae are mainly involved in motility of bacterial cells Option 3) Cyanobacteria lack flagellated cells. Option 4) Mycoplasma is a wall-less microorganism

select the mismatch

  • Option 1)

    Gas vacuoles-Green bacteria

  • Option 2)

    Large central vacuoles – Animal cells

  • Option 3)

    Protists – Eukaryotes

  • Option 4)

    Methanogens –Prokaryotes

 
Option 1) Gas vacuoles-Green bacteria Option 2) Large central vacuoles – Animal cells Option 3) Protists – Eukaryotes Option 4) Methanogens –Prokaryotes
Medical
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Cell division is the process in which a parent cell divides, giving rise to two or more daughter cells. It is an essential biological process in many organisms. It is the means used by multicellular organisms in order to grow, replenish (repair), and reproduce. There are two distinct types of cell division: a vegetative division, whereby each daughter cell is genetically identical to the...
Medical
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Match the stages of meiosis in Column I to their characteristic feature in Column II and select the correct option using the codes given below:

Column I Column II

a. Pachytene  

(i) Paring of homologous chromosomes

b.  Metaphase I

(ii) Terminalization of chiasmata

c.  Diakinesis

(iii) Crossing-over takes place

d. Zygotene

(iv) Chromosomes align at equatorial plate

Codes :

a    b    c    d

  • Option 1)

    (iii)    (iv)    (ii)    (i)

  • Option 2)

    (i)    (iv)    (ii)    (iii)

  • Option 3)

    (ii)    (iv)    (iii)    (i)

  • Option 4)

    (iv)    (iii)    (ii)    (i)

 
As learnt in Pachytene - The third stage of prophase I, bivalent chromosomes clearly appears as tetrads, crossing over between homologous chromosomes occur.   - wherein     Metaphase I - The bivalents chromosomes align on the equatorial plate of spindle. The microtubes from the opposite poles of the spindle attach to the pair of homologous chromosomes.   - wherein     Diakinesis - Final Stage...
Medical
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Select the mismatch.

  • Option 1)

    Gas vacuoles - Green bacteria

  • Option 2)

    Large central vacuoles - Animal cells

  • Option 3)

    Protists - Eukaryotes

  • Option 4)

    Methanogens - Prokaryotes

 
As discussed in Vacuoles in eukaryotic cells - true or sap vacuoles are cmmonly found. -     Vacuole in prokaryotic cells - True or sap vacuoles are usually absent, gas vacuole may be found -     Plant Cell - They have a rigid cell wall and usually larger is Size and cannot change with Shape. - wherein    Sap vacuoles are found in eukaryotes cells but absent in prokaryotic cells, gas vacuoles...
Medical
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During cell growth, DNA synthesis takes place in

  • Option 1)

    S Phase

  • Option 2)

    G1 phase

  • Option 3)

    G2 phase

  • Option 4)

    M phase

 
As discussed in Concentration of substrate on enzyme activity - With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first. The reaction ultimately reaches a maximum velocity , and does not exceed any further.     - wherein   DNA synthesis occurs during S phase.  Option 1) S Phase this is the correct option Option 2) G1 phase this is the incorrect...
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