Ribose and Arabinose are two aldohexoses that yield the same osazone on reaction with phenyl hydrazine.

Tetrose is a four-carbon monosaccharide.

The name "tetrose" comes from "tetr-", meaning four, and "-ose", meaning sugar.

Examples are:

- erythrose

- erythrulose

- threose

There are four possible functional isomers for tetrose sugars. They include erythrose, threose, erythrulose, and threulose. Each of these isomers has a unique arrangement of functional groups that determine its chemical properties and biological functions.

Glucose.

Enzymes are named based on the reaction they catalyze or the substrate they act upon. The naming convention often includes the substrate or function as a prefix, followed by the suffix "-ase". For example, lactase acts on lactose, and lipase breaks down lipids.

There are theories that suggest RNA may not have been the first hereditary system to develop on Earth because RNA molecules can be unstable and require specific conditions for replication. Other molecules like peptides or simple proteins may have served as the first hereditary system due to their greater stability and ability to catalyze reactions. The transition from these simpler systems to RNA-based life forms could have occurred over time through a process of chemical evolution.

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