Question 1

Which bacterial shape is most commonly associated with diseases such as UTIs, food poisoning, and toxic shock syndrome?

Accepted Answer

Cocci

Question 2

During binary fission, what is the primary event that ensures each daughter cell receives a complete copy of the chromosome?

Accepted Answer

Replication of DNA at the plasma membrane

Question 3

A bacterial population is in the logarithmic growth phase. If the generation time is 30 minutes, how many cells will there be after 3 hours if you start with 100 cells? Use $$N = N_0$ 	imes 2$$^{n}$$, where n$ is the number of generations.

Accepted Answer

8000 cells

Question 4

Which environmental factor is most likely to cause plasmolysis in bacteria?

Accepted Answer

Hypertonic solution

Question 5

Which method is best for measuring only living bacterial cells in a sample?

Accepted Answer

Pour plating

Question 6

Which group of bacteria is most likely to be found in the Dead Sea, an environment with extremely high salt concentrations?

Accepted Answer

Obligate halophiles

Question 7

A bacterium that grows best at 45℃ and is found in hot springs is classified as:

Accepted Answer

Thermophile

Question 8

Which bacterial arrangement is described as a beadlike chain and is associated with pathogens causing strep throat?

Accepted Answer

Streptococcus

Question 9

Which of the following is NOT a nutritional requirement for bacterial growth?

Accepted Answer

Chlorine

Question 10

Which type of bacteria can grow with or without oxygen and can switch between aerobic and anaerobic respiration?

Accepted Answer

Facultative anaerobes

Question 11

Which phase of the bacterial population growth curve is characterized by adaptation to the medium and metabolic activity without cell division?

Accepted Answer

Lag phase

Question 12

Which group of bacteria is resistant to penicillin due to the absence of a cell wall?

Accepted Answer

Mycoplasmas

Question 13

Which of the following is a real-world example of a facultatively anaerobic Gram-negative rod used in genetic engineering?

Accepted Answer

Escherichia coli

Question 14

Which method would be most appropriate for quickly estimating the number of bacteria in a turbid liquid culture?

Accepted Answer

Spectrophotometry

Question 15

Which bacteria are classified as 'workhorses' in recombinant DNA technology and are also enteric bacteria?

Accepted Answer

Escherichia coli

Question 16

Which group of bacteria is known for producing methane as a metabolic byproduct and is rapidly killed in the presence of oxygen?

Accepted Answer

Methanogens

Question 17

Which of the following is a major criterion used in the classification of bacteria according to Bergey’s Manual second edition?

Accepted Answer

Analysis of ribosomal subunit RNA nucleotide sequences

Question 18

A bacterium that requires more carbon dioxide than is present in the atmosphere is classified as:

Accepted Answer

Capneic

Question 19

Which bacterial group is important in the food industry for its ability to convert lactose to lactic acid, making products like yogurt and cheese?

Accepted Answer

Lactobacilli

Question 20

Which equation best describes the exponential growth of a bacterial population during the log phase?

Accepted Answer

$$N = N_0$ 	imes 2$$^{n}$$

Chapter 4

Study Guide - Practice Questions

Study Guide - Flashcards