2. Other types of observations…
Many measurements are used in biology.
These include: length, volume, and more…
Remember all measurements have a value and a unit.
For example:
“I am 21 years old”.

4. pH……

5. The effect of pH on a certain enzyme is shown in the graph below.
At what pH is the rate of enzyme action optimal?
acidic (3) neutral
(2) basic (4) below normal

6. Microscopes REMEMBER images get reversed! Eyepiece (10x)
Multiply by power in use to get magnification
allow us to see the unseen.
REMEMBER images get reversed!
Finder (4x)
Low Power (10x)
High Power (40x)
Diaphragm (adjusts light)

7. (1) diameter of the field of view decreases
A student observes a red onion cell with a compound light microscope using low, then high power. The two views are represented below.
The best explanation for the changes observed by the student is that, when switching from low to high
power, the
(1) diameter of the field of view decreases
(2) slide was accidentally moved
(3) diameter of the field of view increases
(4) image is inverted and reversed

8. A student observes a red onion cell with a compound light microscope using low, then high power. The two views are represented below.
Which diagram represents the best cell location in the low-power field of view to be sure the entire cell will be visible after switching to high power?

9. A student observes a red onion cell with a compound light microscope using low, then high power. The two views are represented below.
Which way must the student move the slide in order to center the image in high power?
UP & RIGHT