FREE BIOLOGY AND STUDY GAMES ABOUT BIOL -

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FREE BIOLOGY AND STUDY GAMES ABOUT BIOL -

CHAPTER 27 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -53 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Gram-___ bacteria have a relatively thin peptidoglycan layer in their cell walls, and appear red after a Gram stain.

Answer:

negative Question 2: Antibiotic resistance can spread rapidly in bacterial populations through

Answer:

the transfer of R plasmids

Question 3: Transformation

Answer:

Uptake of DNA directly from the environment

Question 4: Bacterial flagella are composed of

Answer:

a single protein fiber

Question 5: Dutch scientist Antony van Leeuwenhoek was the first scientist to

Answer:

observe and accurately describe microbial life Question 6: Both bacteria and archaea have cell walls, but the cell walls are chemically different between the two. Which describes the cell wall of the Archaea?

Answer:

They lack peptidoglycan.Question 7: A staining process called the ____ _____ classifies bacteria into two groups depending on how much peptidoglycan is contained in their cell walls.

Answer:

gram stain Question 8: Which structure found on the outer surface of some prokaryotic cells functions in propelling the the organism in a fluid environment?

Answer:

Flagellum Question 9: Assimilation of DNA fragments from dead bacterial cells is called which of the following?

Answer:

Natural transformation

Question 10: Which of the following describes the bacterial capsule?

Answer:

An additional gelatinous layer that surrounds the other wall layers Question 11: Prokaryotic reproduction occurs through which of the following processes?

Answer:

Binary fission

Question 12: Bacteria and ____ are collectively referred to as prokaryotes

Answer:

archaea

Question 13: An integrated F plasmid can excise itself from the chromosome. If during such an excision, the F plasmid also picks up some chromosomal DNA, it is called

Answer:

F' Question 14: Organisms in the domains Bacteria and Archaea are collectively referred to as _____

Answer:

prokaryotes Question 15: Peptidoglycan is an important component of the cell walls of which microbes?

Answer:

Most bacteria Question 16: Some bacteria survive harsh conditions in a dormant state, existing in structures called

Answer:

endospores Question 17: If this bacterium readily performs conjugation involving a copy of this plasmid, then the result should be which of the following?

Answer:

The rapid spread of tetracycline resistance to other bacteria in a favorable habitat.Question 18: a ___ is a small independently replicating circle of accessory DNA found in many prokaryotic cells.

Answer:

plasmid Question 19: As the oldest form of life, prokaryotes were the only living organisms on Earth for over ______ years

Answer:

• billion

Question 20: How many chromosomes are typically found in a bacterial cell?

Answer:

One Question 21: An additional protein or glycoprotein layer, which forms a paracrystalline surface in some bacteria and most archaea is called which of the following?

Answer:

S-layer Question 22: While prokaryotes do not reproduce sexually, DNA can be exchange between different cells of the same species or between cells of different species. This is known as ____ gene transfer

Answer:

horizontal

Question 23: Transduction

Answer:

Transfer of DNA by viruses

Question 24: How many types of bacteria can be identified using the Gram stain?

Answer:

Two Question 25: In the 19th century, German physician Robert Koch proposed four postulates that serve to

Answer:

prove a causal relationship between a microorganism and a disease Question 26: Which scientist first observed microorganisms with his homemade microscope?

Answer:

Dutch scientist Antony van Leeuwenhoek

Question 27: Which of the following are true of bacterial flagella?

Answer:

They are rigid and spin like propellers.They are composed of a single protein fiber.