What role does a transcription factor play in a signal transduction pathway?

1. by binding to a plasma membrane receptor it initiates a cascade.
2. it relays a signal from the cytoplasm to the plasma membrane.
3. it activates relay proteins.
4. by binding to dna it triggers the transcription of a specific gene.
5. it is a plasma membrane protein that binds signal molecules.

The answer is (1) It initiates a cascade.

Explanation:

Signal transduction pathways regulate many important cellular functions such as growth, differentiation, metabolism, and survival. Many of these signaling pathways are altered in human cancer.

Receptor tyrosine kinases are cell surface receptors that play a role in the signaling pathways governing cellular processes of metabolism, intercellular communications, differentiation, survival, and proliferation.

They bind to their corresponding growth factors, triggering the downstream signaling cascade.

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answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.