The first step in gene expression would be the transcription of RNA. What happens here is that a part of the DNA is being replicated into the RNA through an enzyme. Therefore, what happens first during transcription is that, the RNA polymerase reaches the start of a gene. The answer would be B.
Answer: 1). Epinephrine binds to a cell-surface receptor; the activated receptor stimulates production of the second messenger, cAMP.
Explanation: Epinephrine action begins by binding of the hormone to its specific receptor protein in the plasma membrane known as adrenergic receptor. This protein is a member of a large family of receptors called G-protein coupled receptors. The binding of epinephrine to its receptor triggers a conformational change in the receptor that affects its interaction with a Gs protein. The bound receptor triggers the replacement of GDP bound to Gs by GTP, thereby activating Gs protein. Gs is a heterotriemeric protein having an alpha, beta and gamma subunits. The activation of the Gs protein causes the alpha subunit of the protein to dissociate and move to another membrane protein called Adenylyl cyclase and activate it. The activated of adenylyl cyclase catalyzes the formation of cyclic AMP (cAMP).
The correct option is B.
Evapotranspiration is the process by which water evaporate from different parts of the earth's surface, from the plants, soils, water bodies, etc, it is the sum total of all the evaporation that occur on the earth's surface. Evaporation occurs when the sunlight heat up the water content of substances and the particles of the water gather enough energy to escape as gas into the atmosphere.
Answer:
it will pop
you can look up more on it to make sure I'm correct but that's what I got from this