PART 1: Use the scales included with the micrographs to determine the size of specimen. Use the longest axis to measure length or use diameter as appropriate.

A. Red blood cells (SEM)

B. Freeze-fractured Red blood cell

C. Human chromosome (#1)

D. Clam egg

E. Paramecium

F. Lymphocyte

G. Guard cell

H. Goose grass cell

I. Bacterium (infected with virus)

Part 2: In each of the following pairs, determine how much larger (how many times) the bigger specimen is than the smaller specimen:

A. Red blood cell (SEM) vs. freeze-fractured red blood cell

B. Human chromosome vs. Guard cell

C. Paramecium vs. clam egg

D. Lymphocyte vs. Bacterium

E. Goose grass cell vs. red blood cells (SEM)

F. Goose grass cell vs. guard cell

G. Lymphocyte vs. freeze-fracture red blood cell

H. Clam egg vs. human chromosome



PART 3: Put the 9 specimens in order from smallest to largest:

________________________, ________________________,

________________________, ________________________,

________________________, ________________________,

________________________, ________________________,

and ________________________.

PART 4: Draw a line that is 10 centimeters long.

How many millimeters is the line?

How many micrometers is the line?

How many nanometers is the line?

How many Angstroms is the line?

For each of the following, tell how many would fit on the 10 centimeter line if they were put end to end:

A. red blood cell (SEM)

B. #1 human chromosome

C. Clam egg

D. Paramecium

E. Lymphocyte

F. Guard cell

G. Goose grass cell

H. Bacterium