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TLS Online TPP Program

#Question id: 1439

Indirect-acting carcinogens are those that:

#SCPH28 | Zoology

  1. chemically react with nitrogen and oxygen atoms in DNA.

  2. can modify bases in DNA so as to distort the normal pattern of base pairing.

  3. are mainly reactive electrophiles.

  4. generally unreactive, often water-insoluble compounds that can act as potent cancer inducers only after the introduction of electrophilic centers.

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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
TLS Online TPP Program

#Question id: 5614

#SCPH01 Biochemistry

One difference between the blastula and gastrula stages of development is that
TLS Online TPP Program

#Question id: 5615

#SCPH01 Biochemistry

The fast block to polyspermy is achieved by:
TLS Online TPP Program

#Question id: 5616

#SCPH01 Biochemistry

In the sperm the elevated Ca2+ level in a relatively basic cytoplasm triggers