Proteins perform all of the following functions except
A. catalyze metabolic reactions blank.
B. give structural strength to cells and tissues
C. produce muscular and other forms of movement
D. regulate transport of solutes into and out of cells
E. store hereditary information
The correct answer and explanation is:
The correct answer is E. store hereditary information.
Proteins are essential biomolecules with a wide variety of functions in living organisms, but storing hereditary information is not one of them. Hereditary information is primarily stored in the form of DNA (deoxyribonucleic acid), not proteins. DNA contains the genetic code that dictates an organism’s development, functioning, and reproduction. While proteins are crucial in the expression and regulation of genetic information, they do not themselves store it.
Proteins perform several other vital functions in the body. One of their most important roles is to catalyze metabolic reactions (choice A). Enzymes are proteins that act as catalysts, speeding up chemical reactions in the body without being consumed in the process. These enzymes are involved in countless biological processes, from digestion to cellular energy production.
Proteins also provide structural strength to cells and tissues (choice B). Examples include collagen, which gives strength and flexibility to connective tissues, and keratin, which strengthens skin, hair, and nails. These structural proteins play a critical role in maintaining the integrity of cells and organs.
In addition to structure, proteins are responsible for muscular movement (choice C). Actin and myosin, two types of proteins, interact to enable muscle contraction, allowing for movement. Without these proteins, muscles would not function properly, affecting all physical activity.
Proteins also regulate transport of solutes (choice D) across cell membranes. Membrane proteins like channels, transporters, and pumps control the movement of ions, nutrients, and waste products in and out of cells, contributing to homeostasis.
In summary, while proteins are essential for many physiological processes, storing hereditary information is not one of their functions—this role belongs to DNA.