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Chapter 4: Problem 8

When bacteria lack fimbriae, what are they less likely to do? a. Adhere to cell surfaces b. retain the ability to divide c. swim through bodily fluids d. synthesize proteins

Short Answer

Expert verified
a. Adhere to cell surfaces

Step by step solution

01

Understanding Fimbriae

Fimbriae are hair-like appendages found on the surface of many bacteria. They play an important role in allowing bacteria to adhere to surfaces, including host cell surfaces.
02

Analyzing Each Option

a. Adhere to cell surfaces: Since fimbriae help bacteria stick to surfaces, without them, bacteria would be less able to adhere to cell surfaces.b. Retain the ability to divide: Fimbriae are not directly involved in cell division, so their absence would not affect this ability.c. Swim through bodily fluids: Fimbriae are not flagella, which are responsible for motility. Thus, their absence would not impact the ability to swim.d. Synthesize proteins: Fimbriae have no role in protein synthesis, which is a function of ribosomes within the bacterial cell.
03

Conclusion

The correct answer is (a) Adhere to cell surfaces, because fimbriae are specifically involved in bacterial adhesion.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Bacterial Adhesion
Bacterial adhesion is a crucial process for bacterial colonization and infection. It refers to the ability of bacteria to attach to various surfaces, including host tissues. This is often the first step in the infection process. Fimbriae, hair-like projections on the bacterial cell surface, play a key role in this process. Without fimbriae, bacteria would struggle to adhere to cell surfaces, making it difficult for them to establish infections. Both pathogenic and non-pathogenic bacteria can exhibit adhesion. This allows them to colonize and form biofilms, which are protective environments that enhance their survival.
Bacteria Surface Structures
Bacteria have various surface structures that serve multiple functions essential for their survival and pathogenicity. Fimbriae, as discussed, are crucial for adhesion. There are also pili, which are longer than fimbriae and are involved in the transfer of genetic material through a process called conjugation. Another important surface structure is the flagellum, which allows bacteria to move. This movement is crucial for finding nutrients and escaping hostile environments. In addition, some bacteria have an outer capsule, a gelatinous layer that protects them from the host's immune system and allows them to avoid being phagocytosed by immune cells. These structures significantly impact how effectively bacteria can colonize and infect a host.
Microbial Cell Surfaces
Microbial cell surfaces are complex and feature a variety of structures that contribute to their functionality and interaction with their environment. The cell wall, for instance, provides structural support and determines the shape of the bacterium. The cell wall can be composed of peptidoglycan in bacteria, which offers rigidity and protection. Beyond the wall, the cell membrane plays a critical role in transporting nutrients in and waste products out. The combination of all these surface elements, including fimbriae, pili, and capsules, helps bacteria survive and thrive in diverse environments. Understanding these components is essential for developing antibacterial treatments and intervention strategies.

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Most popular questions from this chapter

Mammalian red blood cells have no nuclei, must originate in other tissue systems, are relatively long-lived, are small with shapes that actively respond to their environment, and are metabolic anaerobes. Other vertebrates have red blood cells that are usually nucleated and are often relatively large, aerobic, self-replicating, and short-lived. To connect these facts to biology, questions need to be asked. The questions that you pose will depend on the path your class is taking through the curriculum. Begin by summarizing what you know: What are the functions of a eukaryotic cell nucleus? What is the approximate average size of a human red blood cell? What is the range of blood vessel diameters in adult humans? What is the range of red blood cell size in vertebrates? What is the average lifetime of a human red blood cell? How can you show how cell production is stimulated using examples from particular systems? How is cell death controlled? What biochemical cycles are associated with anaerobic and aerobic respiration, and what are the important differences between these? What process is involved in the transport of oxygen and carbon dioxide into and out of red blood cells? What behaviors and dynamic homeostatic processes might be associated with the properties of red blood cells in mammalian and nonmammalian organisms? What do you know about the evolutionary divergences among vertebrates? Your summary has revealed some similarities and differences among vertebrate erythrocyte and circulatory system structures. Scientific questions are testable. They can be addressed by making observations and measurements and analyzing the resulting data. A. Pose three scientific questions that arise from your summaries of what you know about erythrocytes and capillary size. B. For each question you pose, predict what you believe would be the answer and provide reasoning for your prediction. C. Describe an approach you think can be used to obtain data to test your prediction. D. In the production of mammalian red blood cells, erythrocytes that have not yet matured and are still synthesizing heme proteins are surrounded by a macrophage. Predict the role of the macrophage in the maturation of a red blood cell.

What is a difference between prokaryotic and eukaryotic cells? a. Both cells have a nucleus but prokaryotic cells lack cytoplasm. b. Both cells have cytoplasm but prokaryotic cells lack a nucleus. c. Both cells have DNA but prokaryotic cells lack a cell membrane. d. Both cells have a cell membrane but prokaryotic cells lack DNA.

Why does the structure of the cytoplasmic membrane point to a common ancestor? a. The presence of a cytoplasmic membrane in every organism does not point to a common ancestry. b. The similar arrangement of phospholipids and proteins points to common ancestry. c. The lipid nature of the membrane makes it the most primitive trait. d. The similar effect of temperature on the membrane makes it the ancestral trait.

Gap junctions are formed by ________. a. gaps in the cell wall of plants b. protein complexes that form channels between cells c. tight, rivet-like regions in the membranes of adjacent cells d. a tight knitting of membranes

The major role of the cell wall in bacteria is protecting the cell against changes in osmotic pressure, pressure caused by different solute concentrations in the environment. Bacterial cells swell, but do not burst, in low solute concentrations. What happens to bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentrations? a. Bacterial cells will shrink due to the lack of cell wall material. b. Bacterial cells will shrink in size. c. Bacterial cells may burst due to the influx of water. d. Bacterial cells remain normal; they have alternative pathways to synthesize cell walls
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