Question 1

Which statement best describes microbial growth as discussed in Class 5?

Accepted Answer

It refers to population growth through reproduction.

Question 2

Which of the following is the most common reproductive strategy in prokaryotes?

Accepted Answer

Binary fission

Question 3

During binary fission in E. coli, which protein is essential for septation and forms the 'Z ring'?

Accepted Answer

FtsZ

Question 4

What is the correct sequence of the four phases in a typical bacterial growth curve?

Accepted Answer

Lag, exponential (log), stationary, death

Question 5

If a bacterial population increases from $$10^4 to$$ $$10^7$$ cells in 4 hours, what is the generation time ($$G$$)? Use $$n = 3.3 \log_{10} \frac{N_t}{N_0$}$$ and $$G = \frac{t}{n}.$$

Accepted Answer

$$G \approx 40$$ minutes

Question 6

Which phase of the bacterial growth curve should be used to determine generation time?

Accepted Answer

Exponential (log) phase

Question 7

What is the role of MreB in E. coli cell division?

Accepted Answer

It partitions chromosomes into daughter cells.

Question 8

Which of the following contributes to the extreme resistance of bacterial endospores?

Accepted Answer

Presence of a spore coat

Question 9

What is the expected phenotype of an E. coli minCD mutant?

Accepted Answer

Cells form minicells due to improper septation

Question 10

Which process allows bacteria in biofilms to coordinate activities such as virulence and antibiotic resistance?

Accepted Answer

Quorum sensing

Question 11

Why is it important to study bacterial endospores in medical and environmental contexts?

Accepted Answer

They can survive extreme conditions and cause persistent infections.

Question 12

Which of the following is NOT a stage in the eukaryotic cell cycle?

Accepted Answer

Exponential phase

Question 13

In which type of media does E. coli have a shorter generation time?

Accepted Answer

Rich media

Question 14

Which equation correctly calculates the number of generations ($$n) $$during bacterial growth?

Accepted Answer

$$n = 3.3 \log_{10} \frac{N_t}{N_0$}$$

Question 15

Which of the following is a real-world example of a biofilm?

Accepted Answer

Bacterial plaque on teeth

Question 16

Which of the following is NOT a mechanism by which chromosomes are segregated during mitosis/meiosis?

Accepted Answer

Septation

Question 17

What is the main difference between binary fission and multiple fission in prokaryotes?

Accepted Answer

Binary fission involves division into two cells, multiple fission involves division into several cells after cytoplasm partitioning.

Question 18

Which of the following is a plausible consequence of a mutation in the FtsZ gene in E. coli?

Accepted Answer

Failure to form the Z ring, leading to defective cell division

Question 19

Which feature of endospores is most responsible for their resistance to heat and chemicals?

Accepted Answer

Spore coat

Question 20

Which process is illustrated by the formation of a biofilm on teeth?

Accepted Answer

Quorum sensing and multicellular community development

Microbial Growth and Division: Mechanisms, Measurement, and Alternative Lifestyles

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