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Chapter 2: Problem 38

$$ \text { List at least three functions of proteins. (p. 72) } $$

Short Answer

Expert verified
Proteins function as enzymes, provide structural support, and facilitate transport.

Step by step solution

01

Recall Protein Functions

Proteins are essential macromolecules with versatile roles in biological organisms. Recall and list the different functions they perform.
02

Identify Enzymatic Function

Proteins often function as enzymes, which catalyze biochemical reactions in the body. These enzymes speed up reactions crucial for cellular metabolism and other biological processes.
03

Determine Structural Function

Some proteins serve as structural components in cells and tissues. For example, collagen is a protein that provides structural support to connective tissues, while keratin is found in hair and nails.
04

Explore Transport Function

Proteins can also contribute to transport functions. Hemoglobin, for example, is a transport protein responsible for carrying oxygen in the blood.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Enzymatic Function of Proteins
Proteins play a critical role as enzymes in various biological reactions. Enzymes are specialized proteins that act as biological catalysts. This means they speed up chemical reactions in the body without being consumed by the reaction themselves. By lowering the activation energy needed for reactions, enzymes ensure that processes such as digestion, metabolism, and DNA replication happen efficiently.

Some key points about enzymatic proteins include:
  • They are specific to substrates, meaning each enzyme only catalyzes a particular reaction.
  • Enzymes can be affected by factors such as temperature and pH, which can alter their activity.
  • Many enzymes require cofactors or coenzymes to function effectively.
Enzymatic proteins are crucial for maintaining homeostasis in the body by facilitating countless biochemical reactions every second.
Structural Proteins
Structural proteins are essential for maintaining cell shape and integrity, as well as supporting complex bodily systems. These proteins are like the scaffolding of the human body, providing necessary strength and elasticity to tissues and organs.

Notable structural proteins include:
  • Collagen: The most abundant protein in mammals, providing tensile strength to connective tissues such as tendons, ligaments, and skin.
  • Keratin: Found in hair, skin, and nails, offering protection against environmental damage.
  • Elastin: Allowing tissues and organs to stretch and return to their original shape.
Without structural proteins, our bodies would lack the robust framework needed to support life and endure physical activities.
Transport Proteins
Transport proteins serve as vital conduits for substances across cellular membranes and within the bloodstream. They are essential for maintaining nutrient balance and homeostasis.

Examples of transport proteins include:
  • Hemoglobin: Found in red blood cells, hemoglobin binds and transports oxygen from the lungs to the rest of the body and returns carbon dioxide back to the lungs for expulsion.
  • Albumin: A protein in blood plasma that helps in the transport of hormones, vitamins, and drugs.
  • Transferrin: Responsible for transporting iron through the blood to various cells and tissues.
Transport proteins are an indispensable part of biological systems, facilitating the movement of vital molecules necessary for the survival and proper function of living organisms.

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Most popular questions from this chapter

$$ \text { Explain the general functions of nucleic acids. (p. 76) } $$

$$ \text { Explain why a complete atom is electrically neutral. (p. 60) } $$

$$ \text { Identify three major types of chemical reactions. (p. 66) } $$

A covalent bond forms when \((p .64)\) a. atoms share electrons b. positively charged and negatively charged parts of covalent molecules attract c. ions with opposite electrical charges attract d. two atoms exchange protons

$$ \text { Describe the function of an enzyme. (p. 73) } $$
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