What Is a Gene

question 44

Multiple Choice

What is a gene?

• A)A discrete sequence of DNA nucleotides
• B)A section of DNA that codes for one or more proteins
• C)A section of DNA that codes for a portion of a protein
• D)All of these and more are part of the expanding definition of a gene.

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Definitions:

Calcium Carbonate

A chemical compound (CaCO3) found in rocks as the minerals calcite and aragonite and is the main component of pearls, shells of marine organisms, snails, and eggs.

Seawater

The salty water that fills the oceans and seas, composed of a complex mixture of dissolved minerals and organic compounds.

Chert Formation

The process by which chert, a hard, sedimentary rock composed primarily of silicon dioxide, is formed, typically from the accumulation of silica from biological sources or chemical precipitation.

Silica-rich Organisms

Organisms, such as certain diatoms and sponges, that have skeletons made predominantly of silica (SiO2) compounds.