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The correct answer is monosaccharides, polysaccharides, disaccharides. Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen. Monosaccharides are the simplest form of carbohydrates and consist of a single sugar molecule. Polysaccharides are complex carbohydrates made up of many sugar molecules bonded together. Disaccharides are formed when two monosaccharides are joined together. Starch and glycogen are examples of polysaccharides, while glucose is a monosaccharide.

Proteins are macromolecules composed of amino acids, which contain carbon, hydrogen, and oxygen. Nitrogen is the fourth essential element found in proteins. It plays a crucial role in the structure and function of proteins, as it forms the peptide bonds between amino acids, giving proteins their unique three-dimensional shape. Without nitrogen, proteins would not be able to carry out their various functions in the body, such as enzyme catalysis, cell signaling, and structural support. Therefore, nitrogen is an essential element in the composition of proteins.

Monosaccharide refers to a single sugar molecule, disaccharide refers to two sugar molecules bonded together, and polysaccharide refers to a complex carbohydrate made up of many sugar molecules bonded together.

Carbohydrates serve as a storage form of energy in the body, which can be used when needed. They also provide a readily available source of energy for the body to use. Therefore, both options A and B are correct as they accurately describe the functions of carbohydrates.

Carbohydrates are organic compounds that consist of carbon, hydrogen, and oxygen atoms. These three elements are the building blocks of carbohydrates. Carbon provides the backbone of the molecule, while hydrogen and oxygen atoms are attached to the carbon atoms in a specific ratio of 2:1, forming the characteristic structure of carbohydrates. These elements are essential for the formation of glucose, which is the primary source of energy for the body.

The correct answer is A and D. Carbohydrates, lipids, proteins, and nucleic acids are considered the four molecules of life. These molecules are essential for various biological processes and play crucial roles in the structure and function of cells. Carbohydrates provide energy, lipids are important for cell membranes and energy storage, proteins are involved in almost all cellular activities, and nucleic acids carry genetic information. Iron and minerals, water and blood are not considered the four molecules of life.

The given examples are all types of carbohydrates. Starch is a polysaccharide, which is a complex carbohydrate made up of many glucose molecules bonded together. Glucose, fructose, and galactose are monosaccharides, which are simple sugars that cannot be broken down into smaller sugars. Cellulose is also a polysaccharide, but it is different from starch as it cannot be digested by humans and is a major component of plant cell walls.

Amino acids are indeed linked together by peptide bonds, which form the backbone of proteins. They are also the basic building blocks of muscle cells, as proteins are essential for muscle growth and repair. Additionally, amino acids make up the primary layer of protein structure, determining the overall shape and function of proteins. Therefore, all of the given statements are correct.