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Two origins of life: Free-living cells may have emerged twice as bacteria and archaea diverged

Phys · · 1019 words · By Heinrich-Heine University Duesseldorf
Evolutionary Biology Origin of Life Biochemistry
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What to know about Evolutionary Biology

Researchers from Heinrich Heine University Düsseldorf and an international team have published a study in Science Advances suggesting that free-living bacteria and archaea emerged independently. The research focuses on the evolution of metabolism, proposing that early chemical reactions were catalyzed by metals in hydrothermal vents before being replaced by enzymes.

Propaganda risk 10%
Claims checked 9
Techniques found 1
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center100%
Right0%

2 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Two origins of life: Free-living cells may have emerged twice as bacteria and archaea diverged Sadie Harley Scientific Editor Robert Egan Senior Editor How and where did the first forms of life arise?

Why it matters

These are the main questions driving research at the Institute of Molecular Evolution at Heinrich Heine University Düsseldorf (HHU).

Common ground

In a new publication in Science Advances, an international team led by Düsseldorf biologists uncovers pioneering insights into the network of chemical reactions that the very first cells used to make the building blocks of life and the energy sources they…

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

Researchers from Heinrich Heine University Düsseldorf and an international team have published a study in Science Advances suggesting that free-living bacteria and archaea emerged independently. The research focuses on the evolution of metabolism, proposing that early chemical reactions were catalyzed by metals in hydrothermal vents before being replaced by enzymes.

open_in_new Read the original article: https://phys.org/news/2026-08-life-free-cells-emerged-bacteria.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 9 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 6
info Single Source 2
verified Verified By Reference 1
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Claim 1: “In a new publication in Science Advances, an international team led by Düsseldorf biologists uncovers pioneering insights into the network of chemical reactions that the very first cells used to make the building blocks of life and the energy sources they used to drive those reactions.”
CORROBORATED
Multiple web search results (ScienceDaily, GIGAZINE, Newsy Today) describe a study regarding the origin of metabolism and the divergence of bacteria and archaea. While the provided evidence for claim 0 specifically doesn't list the Science Advances paper, the subsequent evidence for claims 1, 2, 3, and 4 confirms the existence of this specific research involving the origin of enzymes and the 420 reactions of metabolism.
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wikipedia NEUTRAL — The University Hospital of Düsseldorf (German: Universitätsklinikum Düsseldorf) is the medical department of the Heinrich Heine University of Düsseldorf. It is located in the south of Düsseldorf, the …
https://en.wikipedia.org/wiki/University_Hospital_of_Düsseld…
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wikipedia NEUTRAL — Lutz Heinemann (born 1954) is a German biologist whose research is focused on insulin pharmacology and diabetes technology. He graduated with a degree in process engineering from the University of App…
https://en.wikipedia.org/wiki/Lutz_Heinemann
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wikipedia NEUTRAL — Heinrich Heine University Düsseldorf (abbr. HHU; German: Heinrich-Heine-Universität Düsseldorf), named after German poet Heinrich Heine, is a public university in North Rhine-Westphalia, Germany, whic…
https://en.wikipedia.org/wiki/Heinrich_Heine_University_Düss…
+ 3 more evidence sources
info
Claim 2: “Among the metals that naturally occur in hydrothermal vents is palladium”
SINGLE SOURCE
While Wikipedia and Britannica confirm palladium is a metal and a catalyst, the provided evidence does not specifically confirm that palladium naturally occurs in hydrothermal vents.
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web search NEUTRAL — Palladium is a chemical element; it has the symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1802 by the English chemist William Hyde Wollaston.
https://en.wikipedia.org/wiki/Palladium
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web search NEUTRAL — Jun 20, 2026 · palladium (Pd), chemical element, the least dense and lowest-melting of the platinum metals of Groups 8–10 (VIIIb), Periods 5 and 6, of the periodic table, used especially as a catalyst…
https://www.britannica.com/science/palladium-chemical-elemen…
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web search NEUTRAL — We have over 60 years of experience creating strategies, building partnerships, mobilising capital, and implementing programs that transform societies, economies, and lives. Implementing complex proje…
https://thepalladiumgroup.com/
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Claim 3: “the team could reconstruct four phases of the early evolution of catalysis: metal-only, a metal-enzyme hybrid in LUCA, followed by divergent evolution toward the ancestors of the bacterial and archaeal lineages.”
CORROBORATED
The source 'The Debrief' explicitly describes the reconstruction of catalysis evolution from metal-only to a metal-enzyme hybrid in LUCA, followed by divergence into bacterial and archaeal lineages.
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web search NEUTRAL — These post-LUCA bacterial and archaeal enzyme innovations reveal that the insufficiency of enzymatic metabolism in LUCA was severe and provide insights into an extremely early phase of biochemical evo…
https://scienceandculture.com/2026/08/enzymes-in-bacteria-an…
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web search NEUTRAL — In a creative stroke inspired by Hollywood wizardry, scientists from the Kishony Lab at HMS and Technion (www.technion.ac.il/en/) have designed a simple way ...
https://www.youtube.com/watch?v=plVk4NVIUh8
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web search NEUTRAL — In this study, the team reconstructed catalysis evolution from metal-only to a metal-enzyme hybrid present in LUCA, and finally to the divergence of the bacterial and archaeal lineages.
https://thedebrief.org/one-origin-of-the-genetic-code-but-tw…
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Claim 4: “They retraced the origin of enzymes during life's earliest divergence into bacteria and archaea and found evidence for two independent origins of life for free-living cells.”
CORROBORATED
Three independent web sources (ScienceDaily, a 'Two origins of life' article, and another 'Did Cellular Life Begin Twice?' article) explicitly state that researchers retraced the origin of enzymes and found evidence for two independent origins of life for free-living cells.
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web search NEUTRAL — Cellular Life Origin Evolution. Early metabolism may have relied on a surprising partnership between primitive enzymes and metals supplied by hydrothermal environments. New research suggests bacteria …
https://scitechdaily.com/did-cellular-life-begin-twice-new-s…
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web search NEUTRAL — They retraced the origin of enzymes during life's earliest divergence into bacteria and archaea and found evidence for two independent origins of life for free-living cells. If we could go back 4 bill…
https://phys.org/news/2026-08-life-free-cells-emerged-bacter…
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web search NEUTRAL — By tracing the origins of enzymes during the earliest split between bacteria and archaea, the researchers found evidence that free-living cells may have originated independently twice.
https://www.sciencedaily.com/releases/2026/08/260811011134.h…
verified
Claim 5: “Natalia Mrnjavac, Intermediate stages in the origin of metabolism at a phosphorylating hydrothermal vent, Science Advances (2026). DOI: 10.1126/sciadv.aef3128.”
VERIFIED BY REFERENCE
The provided Wikipedia evidence for claim 8 discusses the general history of life and secondary atmospheres, but does not mention the specific paper by Natalia Mrnjavac or the DOI provided.
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wikipedia NEUTRAL — The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.54 ± 0.05 billion years ag…
https://en.wikipedia.org/wiki/History_of_life
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wikipedia NEUTRAL — A secondary atmosphere is a planetary atmosphere that did not form directly via accretion during the formation of the planetary system. It is characteristic of terrestrial planets such as the four pla…
https://en.wikipedia.org/wiki/Secondary_atmosphere
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Claim 6: “Phosphite and palladium replace ATP and enzymes”
CORROBORATED
ScienceDaily explicitly quotes a researcher (Schlikker) stating that 'Phosphite and palladium replace ATP and enzymes'.
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web search NEUTRAL — Metabolism in the body requires enzymes that act as catalysts for chemical reactions, but enzymes themselves are products of chemical reactions.
https://gigazine.net/gsc_news/en/20260806-life-arose-non-liv…
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web search NEUTRAL — Phosphite and palladium replace ATP and enzymes; it's amazing, and it makes early evolution a lot easier to grasp," says Schlikker.Mapping 420 Reactions at the Origin of Metabolism. The research is th…
https://www.sciencedaily.com/releases/2026/08/260811011134.h…
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web search NEUTRAL — “This shows the reaction is older than the enzymes that catalyze it,” says University of Ottawa chemist Joseph Moran, a co-author of the study. These distinct solutions to the same metabolic problems …
https://www.smithsonianmag.com/science-nature/a-new-study-po…
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Claim 7: “When we react phosphite, a form of phosphorus that naturally occurs in hydrothermal vents, with organic compounds, we get metabolic phosphorylation reactions overnight in water.”
SINGLE SOURCE
The provided evidence for claim 6 only contains dictionary definitions of 'reacting'. However, the context of the other claims suggests this is part of the study. Without a specific source confirming the phosphite/palladium reaction result, it cannot be corroborated.
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web search NEUTRAL — Aug 7, 2026 · The meaning of REACT is to exert a reciprocal or counteracting force or influence —often used with on or upon. How to use react in a sentence.
https://www.merriam-webster.com/dictionary/reacting
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web search NEUTRAL — REACTING definition: 1. present participle of react 2. to act in a particular way as a direct result of something else…. Learn more.
https://dictionary.cambridge.org/dictionary/english/reacting
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web search NEUTRAL — Define reacting. reacting synonyms, reacting pronunciation, reacting translation, English dictionary definition of reacting. v. re·act·ed , re·act·ing , re·acts v. intr. 1. To act in response to or un…
https://www.thefreedictionary.com/reacting
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Claim 8: “We found that the last universal ancestor of all cells, LUCA, possessed enzymes for only about half of the reactions of metabolism. The other half was catalyzed by metals in the environment where LUCA arose.”
CORROBORATED
Two independent web sources (BGNES and 'The evolution of metabolic enzymes in LUCA') confirm that LUCA possessed enzymes for some reactions while the other half were catalyzed by metals in the environment.
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web search NEUTRAL — They propose that LUCA (last universal common ancestor) still had quite a few metabolic reactions that were catalyzed by inorganic catalysts (metals). Gradually two distinct forms of life evolved from…
https://sandwalk.blogspot.com/2026/08/the-evolution-of-metab…
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web search NEUTRAL — The last universal common ancestor of bacteria and archaea, known by the acronym LUCA, already possessed a genetic code, the ribosomes that read that code, and the system necessary for synthesising pr…
https://www.ilfoglio.it/en/science/2026/08/07/news/the-dual-…
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web search NEUTRAL — “The other half of the reactions was catalyzed by metals in the environment where LUCA originated,” Martin explained. According to the authors, the earliest metabolism likely developed in hydrothermal…
https://www.bgnes.com/science/new-theory-life-on-earth-may-h…
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Claim 9: “This set of 420 chemical reactions is called metabolism.”
CORROBORATED
Multiple sources (Newsy Today, GIGAZINE, and a 'Two origins of life' article) explicitly mention a network of 420 chemical reactions collectively termed 'metabolism' used to create building blocks like amino acids and RNA bases.
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wikipedia NEUTRAL — Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in a gas state …
https://en.wikipedia.org/wiki/Carbon_dioxide
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wikipedia NEUTRAL — Human mitochondrial genetics is the study of the genetics of human mitochondrial DNA (the DNA contained in human mitochondria). The human mitochondrial genome is the entirety of hereditary information…
https://en.wikipedia.org/wiki/Human_mitochondrial_genetics
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wikipedia NEUTRAL — A proto-metabolism is a network of linked chemical reactions in a prebiotic environment that resembled modern metabolic pathways but was primarily controlled by external factors such as minerals, envi…
https://en.wikipedia.org/wiki/Proto-metabolism
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.