Web making in spiders

Spiders make silk in a special part of their body called a gland and use their legs to pull it out of their bodies. This is called spinning.

TLS Online TPP Program

#Id: 3197

#Unit 4. Cell Communication and Cell Signaling

Dominant gain-of-function mutations in proto-oncogenes and recessive loss-of-function mutations in tumor-suppressor genes are oncogenic.

TLS Online TPP Program

#Id: 3208

#Unit 4. Cell Communication and Cell Signaling

Mutations in three broad classes of genes play key roles in cancer induction:
Proto-oncogenes genes
Tumor-suppressor genes
Genome maintenance genes

TLS Online TPP Program

#Id: 3209

#Unit 4. Cell Communication and Cell Signaling

Dominant gain-of-function mutations in proto-oncogenes and recessive loss-of-function mutations in tumor-suppressor genes are oncogenic.

TLS Online TPP Program

#Id: 3210

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 3211

#Unit 4. Cell Communication and Cell Signaling

Three mechanisms can produce oncogenes from the corresponding proto-oncogenes:
Point mutation
Chromosomal translocation
Amplification

TLS Online TPP Program

#Id: 3212

#Unit 4. Cell Communication and Cell Signaling

Point mutation (i.e., a change in a single base pair) in a proto-oncogene that results in a hyperactive or constitutively active protein product.