Not long ago, it was believed that a count of the number of protein-coding genes would provide a count of the number of proteins produced in any given eukaryotic species. This is incorrect, largely due to the discovery of widespread:

alternative splicing

Explanation:

Alternative splicing can be explained or described is a process that enables a messenger RNA (mRNA) to direct synthesis of different protein variants with different cellular functions or properties. This can further be explained as a crucial process for changing the genomic instructions into functional proteins.

Alternative splicing is very important because It plays a critical role in the regulation of gene expression and protein diversity in a variety of eukaryotes and human.

It has been discovered that approximately 95% of multi-exon genes undergo alternative splicing especially in human.

Therefore, the statement made in the question is incorrect because of alternative splicing.

it was believed that a count of the number of protein-coding genes would provide a count of the number of proteins produced in any given eukaryotic species. This is incorrect, largely due to the discovery of widespread ALTERNATIVE SPLICING.

Explanation: Alternative splicing is a regulatory mechanism by which variations in the incorporation of the exons, or coding regions, into mRNA leads to the production of more than one related protein, or isoform. Constitutive splicing is the process of intron removal and exon ligation of the majority of the exons in the order in which they appear in a gene. Alternative splicing is a deviation from this preferred sequence where certain exons are skipped resulting in various forms of mature mRNA.Alternative splicing of RNA is a crucial process for changing the genomic instructions into functional proteins. It plays a critical role in the regulation of gene expression and protein diversity in a variety of eukaryotes. In humans, approximately 95% of multi-exon genes undergo alternative splicing.

There are several advantages of alternative splicing:

(i) it allows a high sequence flexibility of exonic regulatory sequences that puts no constrains on coding requirements.

(ii) the protein interaction can be influenced by small changes in the concentration of regulatory proteins which allows the alternative usage of exons.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

that is true   : ) hope this you