Following statements are regarding to recognition of sperm by mammalian zona pellucida.

A. Sperm that have undergone the acrosome reaction bind directly to zona protein ZP2 and begin making a channel toward the oocyte.

B. Sperm with an intact acrosome bind to ZP2; they undergo the acrosome reaction on the zona pellucida and then transfer their binding to ZP3.

C. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest portions of ZP2 and ZP3, making them nonfunctional and prevent polyspermy.

D. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest ZP3 only, not ZP2 because ZP2 involve in the process of slow block to polyspermy.

Which of the above statements are correct?

TLS Online TPP Program

#Question id: 15993

#Unit 12. Applied Biology

During the isolation of somaclonal variants such as cell selection contain positive selection, describe by which method that the wild type cell are killed by selection agent while the variant cells remain alive?

TLS Online TPP Program

#Question id: 15992

#Unit 12. Applied Biology

The genetic variability present among cultured cells, progeny of such plants is called__

TLS Online TPP Program

#Question id: 15990

#Unit 12. Applied Biology

 Several given biological method involve in the plant transformation, except?

TLS Online TPP Program

#Question id: 15989

#Unit 12. Applied Biology

Genetically modified plants have also been used for___

TLS Online TPP Program

#Question id: 15988

#Unit 12. Applied Biology

 which one is chemically responsible for the plant transformation method?

TLS Online TPP Program

#Question id: 15987

#Unit 12. Applied Biology

Which of the following physical method involve in plant transformation?