Multiple Choice
Which phylum includes animals that lack true tissues?
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1. Introduction to Biology
Introduction to Taxonomy
Multiple Choice
Before Woese's tree of life analysis, which characteristics were primarily used to classify organisms?
A
Molecular structure of ribosomal RNA
B
Genetic sequence similarities
C
Morphological and physiological traits
D
Ecological niche and habitat
Verified step by step guidance1
Understand the historical context of organism classification: Before molecular techniques were widely available, scientists relied on observable traits to classify organisms.
Recognize the primary characteristics used in early classification systems: These included morphological traits (physical structure and appearance) and physiological traits (functional processes such as metabolism).
Consider the limitations of these methods: Morphological and physiological traits can sometimes be misleading due to convergent evolution, where unrelated organisms develop similar traits due to similar environmental pressures.
Contrast this with modern methods: Molecular techniques, such as analyzing ribosomal RNA and genetic sequences, provide more precise and objective ways to classify organisms based on evolutionary relationships.
Relate this to Woese's contribution: Woese's tree of life analysis revolutionized classification by introducing molecular data, specifically ribosomal RNA, to identify evolutionary relationships and establish the three-domain system (Bacteria, Archaea, and Eukarya).
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