Question

Please answer these 3 questions please.

During an infection: One B cell can make more than two different antibodies, provided that they recognize the same antigen Each B-cell produces antibodies to a variety of antigens A variety of antibodies are produced by many B cells, but each B cell only produces one type of antibody The same type of antibody is produced by many B cells

Answer 1

Answer:

1):

The correct option is (C):-A variety of antibodies are produced by many B cells,but each B cell produces one type of antibody.

Explanation:

• Antigens contain different epitopes on their surface which is recognised by the naive B cells and the B cells become matured.
• Now, when each of these epitopes are recognised, the B cell starts producing antibodies against only that epitope.
• By this way different B cells which recognise a single epitope each produce different antibodies against different epitopes of a single antigen but each B cell will produce only a single type of antibodies which is specific for a single epitope.

2):-

The correct option is (B):- Bicoid induces the transcription of hunchback and inhibit translation of caudal.

Explanation:

• Bicoid hucnchback nanos and caudal are maternal effect gene product means that mRNA are localise from the mother cell into the egg.
• These are important for anterior posterior region formation in the drosophila embryo.
• The bicoid and hunchback is responsible for anterior region formation while the nanos and caudal are responsible for posterior region formation.
• Bicoid induces the higher transcription of hunchback while inhibit the caudal translation.
• In posterior nanos induce the transcript of nanos and inhibit the translation of hunchback.
• This result in high to low concentrations gradient formation for bicoid and hunchback anterior to posterior while for nanos and caudal posterior to anterior.
• If bicoid gene is mutated then absence of anterior ( head and thorax) will occur in embryo while injection of bicoid in the middle of embryo lead to new head formation in the middle region of embryo.

Note: As per rules I should answer only 1 but I have answered 2

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