BackWhich of the following clues would tell you whether a cell is prokaryotic or eukaryotic?
a. The presence or absence of a rigid cell wall
b. Whether or not the cell is partitioned by internal membranes
c. The presence or absence of ribosomes
d. Both b and c are important clues
Which of the following cell structures would you expect to be most important in the growth of bacteria on the surface of your teeth?
a. Cell wall
b. Fimbriae
c. Flagella
d. Cilia
Eukaryotic cells differ from prokaryotic cells in that only eukaryotic cells ________.
a. Contain DNA
b. Have a plasma membrane
c. Are considered to be alive
d. Have a nucleus
e. Are able to evolve
Is this statement true or false?
'Animal cells have mitochondria; plant cells have chloroplasts.'
Explain your answer, and describe the functions of these organelles.
Imagine a spherical cell with a radius of 10 μm. What is the cell's surface area in μm²?
Its volume, in μm³? (Note: For a sphere of radius r, surface area = 4πr² and volume = 4/3πr³.). Remember that the value of π is 3.14.)
What is the ratio of surface area to volume for this cell? Now do the same calculations for a second cell, this one with a radius of 20 μm. Compare the surface-to-volume ratios of the two cells.
How is this comparison significant to the functioning of cells?