Endocrine signaling is hormone based signaling that travels through the blood stream. Many of the sensors and integrating sensors of the endocrine system are located in the brain. The brain barrier contributes to endocrine signalling, such that the brain barrier does not factor in with endocrine signalling. The answer is A
Gel electrophoresis is a technique used to separate DNA fragments (or other macromolecules, such as RNA and proteins) based on their size and charge. Electrophoresis involves running a current through a gel containing the molecules of interest.
Youre using the distributive property. sk you multiply negative three by x and negative 5. itt equals negative three x and positive 15. you subtract 15 frkm 45. which leaves 30. then you divide by negative three. the answer is negative ten.