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[NiFe] hydrogenase is a type of hydrogenase, which is an oxidative enzyme that reversibly converts molecular hydrogen in prokaryotes including Bacteria and Archaea. [1] [2] The catalytic site on the enzyme provides simple hydrogen-metabolizing microorganisms a redox mechanism by which to store and utilize energy via the reaction
Dissimilatory nitrate reduction to ammonium is a two step process, reducing NO 3 − to NO 2 − then NO 2 − to NH 4 +, though the reaction may begin with NO 2 − directly. [1] Each step is mediated by a different enzyme, the first step of dissimilatory nitrate reduction to ammonium is usually mediated by a periplasmic nitrate reductase.
We also see that the size is another difference between these prokaryotic and eukaryotic cells. The average eukaryotic cell has about 25 times more DNA than a prokaryotic cell does. Replication occurs much faster in prokaryotic cells than in eukaryotic cells; bacteria sometimes only take 40 minutes, while animal cells can take up to 400 hours.
The enzyme phenylalanine ammonia lyase (EC 4.3.1.24) catalyzes the conversion of L-phenylalanine to ammonia and trans-cinnamic acid.: [1] L -phenylalanine = trans -cinnamate + NH 3 Phenylalanine ammonia lyase (PAL) is the first and committed step in the phenyl propanoid pathway and is therefore involved in the biosynthesis of the polyphenol ...
The enzyme triacylglycerol lipase (also triglyceride lipase, EC 3.1.1.3;systematic name triacylglycerol acylhydrolase) catalyses the hydrolysis of ester linkages of triglycerides: [1] triacylglycerol + H 2 O ⇌ diacylglycerol + a carboxylate. These lipases are widely distributed in animals, plants and prokaryotes.
A prokaryote (/ p r oʊ ˈ k ær i oʊ t,-ə t /; less commonly spelled procaryote) [1] is a single-celled organism whose cell lacks a nucleus and other membrane-bound organelles. [2] The word prokaryote comes from the Ancient Greek πρό (pró), meaning 'before', and κάρυον (káruon), meaning 'nut' or 'kernel'. [3]
In this biological process, which is a redox comproportionation reaction, nitrite and ammonium ions are converted directly into a diatomic molecule of nitrogen and water. [8] NH + 4 + NO − 2 → N 2 + 2 H 2 O (ΔG° = −357 kJ⋅mol −1). [9] Globally, this process may be responsible for 30–50% of the N 2 gas produced in the oceans. [10]
In prokaryotes, like E. coli, DNA Pol III is the major polymerase involved with DNA replication. While DNA Pol II is not a major factor in chromosome replication, it has other roles to fill. DNA Pol II does participate in DNA replication. While it might not be as fast as DNA Pol III, it has some abilities that make it an effective enzyme.
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