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Ch. 11 - Characterizing and Classifying Prokaryotes
Bauman - Microbiology with Diseases by Taxonomy 6th Edition
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Bauman 6th EditionCh. 11 - Characterizing and Classifying Prokaryotes문제 3
11장, 문제 3

Which of the following terms best describes stiff, spiral-shaped prokaryotic cells?


a. Cocci
b. Bacilli
c. Spirilla
d. Spirochetes

검증된 단계별 안내
1
Step 1: Understand the shape terminology for prokaryotic cells. 'Cocci' refers to spherical-shaped bacteria, 'Bacilli' refers to rod-shaped bacteria, 'Spirilla' refers to rigid spiral-shaped bacteria, and 'Spirochetes' refers to flexible spiral-shaped bacteria.
Step 2: Identify the key descriptor in the question: 'stiff, spiral-shaped prokaryotic cells.' This indicates the cells have a spiral shape and are rigid rather than flexible.
Step 3: Compare the options with the description: Cocci (spherical) and Bacilli (rod-shaped) do not match the spiral shape, so they can be excluded.
Step 4: Between 'Spirilla' and 'Spirochetes,' note that Spirilla are known to be rigid or stiff spiral-shaped bacteria, while Spirochetes are more flexible and have a unique corkscrew motion.
Step 5: Conclude that the term best describing stiff, spiral-shaped prokaryotic cells is 'Spirilla.'

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주요 개념

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Prokaryotic Cell Shapes

Prokaryotic cells have distinct shapes that help in their identification. Common shapes include cocci (spherical), bacilli (rod-shaped), and spiral forms. Understanding these shapes is fundamental to classifying bacteria and predicting their behavior.
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Prokaryotic & Eukaryotic Cells

Spiral-Shaped Bacteria Types

Spiral-shaped bacteria are categorized mainly into spirilla and spirochetes. Spirilla are rigid, spiral-shaped bacteria with external flagella, while spirochetes are flexible and have internal flagella, allowing different modes of movement.
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Spiral-shaped Bacterial Cells

Terminology for Bacterial Morphology

Accurate terminology is essential in microbiology to describe bacterial morphology. Terms like cocci, bacilli, spirilla, and spirochetes specify shape and structural features, aiding in identification and understanding of bacterial physiology.
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