macromolecules: 12. what are the four macromolecules? 13. what does it mean that all macromolecules are organic? 14. what is the reaction that connects monomers? 15. what is the reaction that breaks down polymers? 16. what are the main three types of carbohydrates? 17. what is glucose?

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Accepted Answer

### Question 12
# Brief Explanations:
Macromolecules are large molecules essential for life. The four main types are determined by biological and chemical studies in the field of Biology (a subfield of Natural Science). Carbohydrates provide energy, lipids store energy and have structural roles, proteins perform many cellular functions, and nucleic acids carry genetic information.
# Answer:
The four macromolecules are carbohydrates, lipids, proteins, and nucleic acids.

### Question 13
# Brief Explanations:
In chemistry and biology, organic compounds are defined as those containing carbon - hydrogen (C - H) bonds (along with other elements like O, N, etc.). Macromolecules like carbohydrates (with C, H, O), proteins (with C, H, O, N, etc.), lipids (many with C - H bonds), and nucleic acids (with C, H, O, N, P) all contain carbon and are part of organic chemistry's scope, which is relevant to Biology (Natural Science subfield) as these molecules are vital for living organisms.
# Answer:
Saying all macromolecules are organic means they are organic compounds (contain carbon, often in chains or rings with hydrogen and other elements like oxygen, nitrogen, phosphorus) and are based on carbon - containing structures, fitting the definition of organic molecules (molecules with carbon - hydrogen bonds or related carbon - based structures, typical of compounds in living systems).

### Question 14
# Brief Explanations:
In biochemistry (part of Biology, Natural Science), monomers are joined to form polymers. The dehydration synthesis reaction removes a water molecule ($H_2O$) to form a covalent bond between monomers. For example, in carbohydrate polymerization, two monosaccharides lose a water molecule to form a disaccharide.
# Answer:
The reaction that connects monomers is dehydration synthesis (also called condensation reaction), where a water molecule is removed as monomers are linked by a covalent bond.

### Question 15
# Brief Explanations:
In biological and chemical processes (Biology, Natural Science), polymers are broken down into monomers. Hydrolysis uses a water molecule to break the covalent bond between monomers. For instance, in digestion, polymers like starch are broken down into glucose monomers via hydrolysis.
# Answer:
The reaction that breaks down polymers is hydrolysis, where a water molecule is used to break the covalent bond between monomers, separating the polymer into its monomer units.

### Question 16
# Brief Explanations:
In the study of carbohydrates (a topic in Biology, Natural Science), carbohydrates are classified based on their structure and complexity. Monosaccharides are single sugar units (e.g., glucose), disaccharides are two - sugar units (e.g., sucrose), and polysaccharides are long chains of sugar units (e.g., starch, glycogen, cellulose).
# Answer:
The main three types of carbohydrates are monosaccharides (single sugar units, e.g., glucose), disaccharides (two sugar units, e.g., sucrose), and polysaccharides (polymers of many sugar units, e.g., starch, glycogen, cellulose).

### Question 17
# Brief Explanations:
In Biology (especially biochemistry, a subfield of Natural Science), glucose is a key monosaccharide. It has the chemical formula $C_6H_{12}O_6$, is a primary source of energy for cells (used in cellular respiration), and is a monomer for polysaccharides like starch and glycogen. It is a simple sugar (monosaccharide) with a six - carbon ring structure (in its cyclic form) or a linear form.
# Answer:
Glucose is a monosaccharide (simple sugar) with the chemical formula $C_6H_{12}O_6$. It is a primary energy source for cells (used in cellular respiration), a monomer for polysaccharides (e.g., starch, glycogen), and has a six - carbon structure (often in a ring form in biological systems).

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