Subjects
PRICING
COURSES
SIGN IN
Start Free Trial
Dalton B.
Harvard University
Tutor Satisfaction Guarantee
Chemistry
TutorMe
Question:

Which atom prefers to hold onto its electrons more tightly? A. Fluorine B. Tungsten C. Cesium

Dalton B.
Answer:

This is a question probing at the concept of electronegativity and trends in the periodic table. The correct answer is A! Fluorine holds onto its electrons more tightly because it is only one electron away from having a stable octet. It as two options to become stable: 1. Give up seven electrons or take one. It would much rather (due to energetic favorability) gain one electron to create a stable 8 valence electron shell.

Basic Chemistry
TutorMe
Question:

What is the electron configuration of P?

Dalton B.
Answer:

[Ne}3s^2 3p^3

Biology
TutorMe
Question:

You are responsible for creating an inducible trans-gene system to ablate the immune cells of zebrafish, and you are told that you will be using the nitroreductase mediated ablation method recently described in a Nature Communications article. Before you begin you want to plan out the experiment, you want to make sure that the NTR gene is only expressed in the immune cells. How will you ensure that the NTR gene is only expressed in the immune cells and what are some drawbacks to this method?

Dalton B.
Answer:

First, obtain specificity in a trans-gene system such as the NTR mediated ablation system, you must find a specific promotor. However, there is not one specific promotor that is expressed in only immune cells, so you will have to create multiple constructs to attack each cell line lineage. Second, even if a promotor is specific to the immune system, you must make sure that its expression is sufficiently strong. In this case, you would want strong expression to express a lot of the NTR protein to reduce the amount of drug that you needed to add to ablate the immune system.

Send a message explaining your
needs and Dalton will reply soon.
Contact Dalton
Ready now? Request a lesson.
Start Session
FAQs
What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Session" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.