A scientist who studies DNA double helix is called a molecular geneticist or a geneticist specializing in molecular Biology.
A scientist who studies fungi is called a mycologist. They specialize in the study of fungi, which includes their taxonomy, biology, and ecology.
A chemist
A scientist who studies gems such as rubies and diamonds is called a gemologist. They are experts in identifying and evaluating the quality and characteristics of gemstones.
A scientist who studies El Niño is called a climatologist or an oceanographer specializing in tropical climate dynamics.
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A double helix.
A biotechnology scientist.
A Double Helix.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies viruses is called a virologist.
A scientist who studies mollusks is called a malacologist.
A scientist that studies bears would be called an ursinologist.
An aviologist.
biologist
virologist
A meteorologist.
astronomer