1. (D) suberin Cellulose is the basis of the cell wall present in plants. The cell wall of almost all organisms is made up of cellulose, while lipids along with some proteins form the basic building blocks of the plasma membrane. The plasma membrane is semipermeable and is not impermeable to water. LigRead more

    (D) suberin
    Cellulose is the basis of the cell wall present in plants. The cell wall of almost all organisms is made up of cellulose, while lipids along with some proteins form the basic building blocks of the plasma membrane. The plasma membrane is semipermeable and is not impermeable to water.
    Lignin is a complex polymer that acts as a cement and hardens the cell wall. It provides flexibility, great tensile and compressive strength to the cell wall and makes the cell wall impermeable. It is present in sclerenchyma cells and not in cork cells. The walls of cork cells are much thicker than suberin, an organic material. Suberin makes these cells impervious to water and gases.

    See less
    • 1
  2. An antigen is a foreign substance that elicits the formation of an ntibody. Antibody is a protein that is synthesised in response to an antigen. Antigen and antibody show high degree of specificity in binding each other Two diagnostic kits based on antigen-antibody interaction are. a. ELISA for HIV.Read more

    An antigen is a foreign substance that elicits the formation of an ntibody. Antibody is a protein that is synthesised in response to an antigen. Antigen and antibody show high degree of specificity in binding each other Two diagnostic kits based on antigen-antibody interaction are.
    a. ELISA for HIV.
    b. Pregnancy test kits.

    See less
    • 1
  3. In the absence of antibiotic, there will be no pressure on recombinants to retain the plasmid (containing the gene of your interest). Since, intaining a high copy number of plasmids is a metabolic burden to the microbial ells, will thus tend to lose the plasmid.

    In the absence of antibiotic, there will be no pressure on recombinants to retain the plasmid (containing the gene of your interest). Since, intaining a high copy number of plasmids is a metabolic burden to the microbial ells, will thus tend to lose the plasmid.

    See less
    • 1
  4. It is the period of life, when the body undergoes changes, leading to reproductive maturity. The period between childhood and adulthood is called adolescence.

    It is the period of life, when the body undergoes changes, leading to reproductive maturity. The period between childhood and adulthood is called adolescence.

    See less
    • 1