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Zachary L.
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Organic Chemistry
TutorMe
Question:

What is the conceptual understanding of a nucleophilic attack?

Zachary L.
Answer:

A nucleophilic attack is best understood as a species with available electrons reacting with a species of positive charge or low electron density. For example, ammonia can react with a carbonyl carbon because nitrogen's lone pair of electrons attacks the partially positive carbon atom. This carbon atom has a partial positive charge because its electron density is shifted towards the oxygen atom double-bonded to it.

Pre-Calculus
TutorMe
Question:

What is the appropriate method for graphically subtracting two vectors (a - b)?

Zachary L.
Answer:

Using the "tip-to-tail" method, we will combine the arrow end of vector a to vector b. Since this is subtraction, we must reverse the direction of vector b before attaching. Finally, we draw a resultant vector from the origin of vector a to the arrow end of our reversed vector b.

Biology
TutorMe
Question:

How does increased calcium ion intake at the synapse of neurons impact the ability to release neurotransmitters?

Zachary L.
Answer:

Calcium ion intake acts as a messenger in the neuron, causing vesicles containing neurotransmitters to fuse with the cell membrane and release neurotransmitters into the synaptic cleft.

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