Microbe Mission B/C

Test your knowledge of various Science Olympiad events.
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Alex-RCHS
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Re: Microbe Mission B/C

Postby Alex-RCHS » April 12th, 2018, 8:38 pm

fabishkf wrote:
Answer
Not quite. How I understand it, the half numerical aperture is an angle measurement, so the max value would be 90 (180 would be the max for the angular aperture, and would occur when the cover slip is touching the objective lens). So, it'll be larger than 2.745. To solve this problem, you would first solve for the numerical aperture with the resolution equation (resolution = wavelength / 2*NA) then use that to solve for one-half angular aperture in the numerical aperture equation. So the NA is 1.125, and the one-half angular aperture is 47.95 degrees. You can also use the resolution equation resolution = 1.22*wavelength / numerical aperture, which I think is what you were using (except in this problem I was talking about the NA of the entire microscope, didn't factor in that both the condenser and the objective would have a numerical aperture; probably should've specified that). I think the formula varies based on the microscope, but I'm not sure.

Okay, I’m pretty sure that’s called the half-angle, not the half-angle aperture. I solved for the combined numerical apertura of the condenser and the objective, which is obviously not right.

I had never heard of that equation you listed. I’ll put it in my notes — thanks. Is the NA in that equation of the whole microscope or just the objective?
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fabishkf
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Re: Microbe Mission B/C

Postby fabishkf » April 13th, 2018, 5:20 am

It is of the whole microscope. Apologies if I used the incorrect term.
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Re: Microbe Mission B/C

Postby ScandinavianBeaver » May 5th, 2018, 11:06 am

Might as well post another question...

The following proteins are encoded by the HIV virus genome(regulatory proteins not included):
1. Reverse transcriptase
2. Integrase
3. HIV Protease
4. Spacer protein
5. Capsid protein
6. Matrix protein
7. gp120

a. What proteins are used for HIV replication?
b. What is the function of HIV protease and what happens if the protein is inhibited?
c. What protein binds to CD4 on cells, and how does this allow the virus to penetrate?

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Nano1llus10n
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Re: Microbe Mission B/C

Postby Nano1llus10n » May 6th, 2018, 6:39 pm

ScandinavianBeaver wrote:Might as well post another question...

The following proteins are encoded by the HIV virus genome(regulatory proteins not included):
1. Reverse transcriptase
2. Integrase
3. HIV Protease
4. Spacer protein
5. Capsid protein
6. Matrix protein
7. gp120

a. What proteins are used for HIV replication?
b. What is the function of HIV protease and what happens if the protein is inhibited?
c. What protein binds to CD4 on cells, and how does this allow the virus to penetrate?


Answer
1. Reverse transcriptase, Integrase, HIV Protease, Spacer protein
2. It cleaves the large nonstructural protein precursor; inhibition prevents replication of virions
3. gp120; it allows adhesion to the host cell and eventually the fusion of membranes
2017-2018 (Div C)
Event: MIT/R/S/N
Anatomy and Physiology: 8/3/2/26
Helicopters: 11/-/2/43
Microbe Mission: 13/2/2/8

2018-2019 (Div C)
Event: R/S/N
Anatomy and Physiology: 1/2/8
Designer Genes: 1/2/4
Protein Modeling: 1/3/2
Wright Stuff: 2/2/9


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