An exon is considered a "coding sequence" of dna, and its information is retained in the processed mrna within a cell. true/false

True

Explanation:

Exon is a part of gene that encodes for final mature RNA after processing. In the process of RNA splicing, introns are removed and exons are retained and joined to produce mature mRNA.

They have protein coding sequence and also UTR ( Untranslated Region ) which plays a role in translation termination and post transcriptional gene expression. Human genome has only 1.1% exon and is majorly composed of introns and intergenic DNA.

When your muscle cells are performing function at an easy relaxed pace they take in oxygen from the blood and prefers to make energy using "aerobic methods", but in extreme conditions such as strenuous exercise without oxygen, the normal aerobic respiration becomes anaerobic and creates lactic acid in order to cope up with the energy needs.