Multiple Choice
According to Whittaker's system of classification, which kingdom includes multicellular, photosynthetic organisms with cell walls made of cellulose?
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1. Introduction to Microbiology
Introduction to Taxonomy
Multiple Choice
How did the classification of microorganisms change from the kingdom system to the domain system in taxonomy?
A
The domain system eliminated the use of genetic information for classification.
B
The domain system introduced three domains—Bacteria, Archaea, and Eukarya—based on differences in ribosomal RNA sequences.
C
The domain system grouped all microorganisms into a single domain called Prokaryota.
D
The domain system classified organisms solely based on their mode of nutrition.
Verified step by step guidance1
Step 1: Understand the traditional kingdom system, which classified organisms into broad groups such as Monera, Protista, Fungi, Plantae, and Animalia, primarily based on observable characteristics like cell structure and nutrition.
Step 2: Recognize that advances in molecular biology, especially the analysis of genetic material like ribosomal RNA (rRNA) sequences, provided new insights into evolutionary relationships among organisms.
Step 3: Learn that the domain system was introduced to reflect these genetic differences more accurately, dividing life into three domains: Bacteria, Archaea, and Eukarya, which represent fundamental differences in cell types and genetic makeup.
Step 4: Note that this system emphasizes molecular data, particularly rRNA sequence comparisons, rather than just morphological or nutritional traits, allowing for a more precise classification of microorganisms.
Step 5: Conclude that the domain system replaced the kingdom system by focusing on genetic relationships, leading to a clearer understanding of microbial diversity and evolutionary history.
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