Lesson 35 - Binary fission and logs

Question 1

How to calculate the mitotic index?

Answer 1

The number of cells in a particular stage of the cell cycle ➗
Total number of cells

Question 2

What is the difference between mitosis in animal and plant cells?

Answer 2

In animals the cell divides from the sides.
In plant cells the cell divides from the middle.

Question 3

How does binary fission in binary cells occur?

Answer 3

1. replication of circular DNA
2. Replication of plasmids
3. Division of the cytoplasm

Question 4

Do bacterial cells multiply exponentially?

Answer 4

Yes

Question 5

No. of cells after 3 generations

Answer 5

No. of cells after 3 generations = initial number of bacteria x (2x2x2)

Question 6

What do logarithm scales show us?

Answer 6

The orders of magnitude in a linear fashion.
Zero can never be reached.

Question 7

Why would it sometimes be better to use a log scale?

Answer 7

Because the numbers increase so rapidly and become SO large

Question 8

What is the formula for finding the log of a number?

Answer 8

Logb n = p
“The base (b) raised to what power (p) equals the number (n)”

Question 9

Suggest and explain how 2 environmental variables could be changed to increase the growth rate of a group of bacterial cells

Answer 9

1. Increased concentration of glucose;
2. Increased respiration;
3. Increased concentration of oxygen;
4. Increased respiration;
5. Increased temperature;
6. Increased enzyme activity;
7. Increased concentration of phosphate;
8. Increased ATP/DNA/RNA synthesis;
9. Increased concentration of nucleotides;
10. Increased DNA synthesis;