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TLS Online TPP Program

#Question id: 2673

For a repressible operon to be transcribed, which of the following must be true?

#SCPH05 I Biotechnology

  1. A corepressor must be present.

  2. RNA polymerase must bind to the promoter, and the repressor must be inactive.

  3. RNA polymerase and the active repressor must be present.

  4. RNA polymerase cannot be present, and the repressor must be inactive.

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TLS Online TPP Program

#Question id: 5608

#SCPH01 Biochemistry

Stereoblastulae -
TLS Online TPP Program

#Question id: 5609

#SCPH01 Biochemistry

Just before sperm addition, sea urchin eggs are microinjected with a calcium chelator. What event will most likely not takes place after fertilization?
TLS Online TPP Program

#Question id: 5610

#SCPH01 Biochemistry

The acrosome reaction involves the extension of the acrosomal Process:
TLS Online TPP Program

#Question id: 5611

#SCPH01 Biochemistry

Which ion play an essential role in pollen tube growth?
TLS Online TPP Program

#Question id: 5612

#SCPH01 Biochemistry

Outside the egg cell membrane is an extracellular matrix that forms a fibrous mat around the egg and is often involved in sperm-egg recognition. In invertebrates, this structure is usually called the:
TLS Online TPP Program

#Question id: 5613

#SCPH01 Biochemistry

Female mice with the CD9 gene knocked out are infertile because