Bio 1500 - Exam 1 (Mizzou-Bush)
1. the passive movement of molecules: diffusion
2. what type of thermal movements is diffusion driven by?: Brownian
3. characteristics of individual molecules?: -random, unpredictable motion
-not directed to low concentration
-never stops
4. characteristics of the net movement of all molecules?: -is predictable
-directed from high to low concentration
-stops when it reaches equilibrium
5. how does the diffusion time change with the distance traveled?: diffusion time
increases with the square of the distance
6. [EXAMPLE] 2x distance equals....: 4 fold time
7. [EXAMPLE] 10x distance equals....: 100 fold time
8. diffusion works great within what types of cells? except for which cells?: -within
1/3
, cells that lengthen between 1-100 micrometers
-doesn't work good within axons
9. the capacity to do work or cause motion: energy
10. two types of energy?: kinetic & potential
11. energy due to motion; includes heat, light, and electricity: kinetic energy
12. stored energy due to position; includes chemical energy in bonds: potential
energy
13. what is the First Law of Thermodynamics?: energy can neither be created nor destroyed, but
can change from one form to another
14. wavelengths have more energy and have less energy: short; long
15. which wavelengths can cause cancer?: -gamma rays
-UV rays
-x rays
16. describe how we perceive colors.: the colors we perceive are based on which wavelengths strike
2/3
1. the passive movement of molecules: diffusion
2. what type of thermal movements is diffusion driven by?: Brownian
3. characteristics of individual molecules?: -random, unpredictable motion
-not directed to low concentration
-never stops
4. characteristics of the net movement of all molecules?: -is predictable
-directed from high to low concentration
-stops when it reaches equilibrium
5. how does the diffusion time change with the distance traveled?: diffusion time
increases with the square of the distance
6. [EXAMPLE] 2x distance equals....: 4 fold time
7. [EXAMPLE] 10x distance equals....: 100 fold time
8. diffusion works great within what types of cells? except for which cells?: -within
1/3
, cells that lengthen between 1-100 micrometers
-doesn't work good within axons
9. the capacity to do work or cause motion: energy
10. two types of energy?: kinetic & potential
11. energy due to motion; includes heat, light, and electricity: kinetic energy
12. stored energy due to position; includes chemical energy in bonds: potential
energy
13. what is the First Law of Thermodynamics?: energy can neither be created nor destroyed, but
can change from one form to another
14. wavelengths have more energy and have less energy: short; long
15. which wavelengths can cause cancer?: -gamma rays
-UV rays
-x rays
16. describe how we perceive colors.: the colors we perceive are based on which wavelengths strike
2/3
