Lecture 2 Flashcards
1
Q
The gene Src normally is activated by extracellular signals called growth factors. When the growth factors are present, Src instructs the cell to divide. A mutant form of Src is found in many cancer tumors. The mutant form of Src is active in the absence of growth factors. The mutated Src is a:
A
Oncogene
2
Q
How would you test whether or not something is necessary?
A
Break or remove the component from the system
3
Q
How would you test whether or not something is sufficient?
A
Add the component to the system
4
Q
What is the equation for resolution? Interpret its components.
A
D = (0.61λ)/(n sinα)
- D = limit of resolution (low D –> higher resolution)
- λ = wavelength of light
- n = refractive index (air = 1.0, water = 1.3)
- sinα = 1/2 the angle of light
5
Q
What is the effect of the refractive index on resolution?
A
High refractive index –> smaller limit of resolution –> higher resolution
