On June 21st of every year, the southern hemisphere begins the season of <em><u>winter </u></em>, and the northern hemisphere begins the season of <u><em>summer</em></u> .
Answer:
receptor tyrosine kinases
Explanation:
Protein kinase receptors are simply saying receptors with associated kinases (usually tyrosine kinases).
Protein kinases are enzymes that have the ability to modulate other enzymes (or some other proteins) by adding the phosphate group. This is known as phosphorilation process. As a result of structural change, protein can change its activity (phosphorilation usually increase the activity).
Such receptors are involved in a many processes within an organism that are important for the cellular growth, differentiation, metabolism
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The correct answer is B.) The color of the shirt you are wearing.
Color has no effect upon any physical contact. However, chemical/electrical contact has physical effect.
For example, you rub your feet on a carpet with socks and shock someone. They had a physical effect upon contact. The color of your shirt has no physical effect on anything besides visuals.