What does the biochemistry and energy part of the Florida Biology 1 EOC cover?

It covers the properties of water that support life, the four macromolecules (carbohydrates, lipids, proteins, and nucleic acids), enzymes as catalysts that lower activation energy, photosynthesis (the reactants, products, and chloroplast), cellular respiration (aerobic and anaerobic), and how photosynthesis and respiration are interrelated. This content is part of Reporting Category 1, Molecular and Cellular Biology, which is about 35 percent of the exam.

Why are the properties of water important for life?

Water is polar and forms hydrogen bonds, which gives it cohesion and adhesion (helping water move up plants and creating surface tension), a high specific heat (so it resists temperature change and stabilizes organisms and climates), solvent power (it dissolves many substances so reactions and transport can happen), and the unusual property that ice is less dense than liquid water (so ice floats and insulates the water below, letting life survive winter).

What do enzymes do, and why do temperature and pH affect them?

Enzymes are biological catalysts (usually proteins) that lower the activation energy of a reaction so it goes faster, and they are not used up. Each enzyme has an active site shaped to fit a specific substrate (lock and key). Because the active site depends on the protein's shape, temperature and pH matter: each enzyme has an optimum, and conditions far from it denature the enzyme, changing the active-site shape so the substrate no longer fits and the rate falls.

What are the reactants and products of photosynthesis and respiration?

Photosynthesis uses carbon dioxide and water with light energy to make glucose and oxygen, in the chloroplast. Aerobic respiration uses glucose and oxygen to release energy (ATP), producing carbon dioxide and water, mostly in the mitochondrion. They are the reverse of each other: the products of one are the reactants of the other, so they cycle matter while energy flows from light through glucose to heat.

Do plants carry out cellular respiration?

Yes. Plants respire continuously, day and night, to release the energy stored in glucose, just like animals. They photosynthesize only when light is available. So in daylight a plant does both at once, and in the dark it only respires. The idea that plants do not respire is a common misconception the EOC tests directly.

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Florida Biology 1 EOC biochemistry and energy: a complete overview of water, macromolecules, enzymes, photosynthesis, and cellular respiration

A deep-dive guide to the biochemistry and energy half of Reporting Category 1 of the Florida Biology 1 EOC: the properties of water, the four macromolecules, enzymes and activation energy, photosynthesis, cellular respiration, and how the two energy processes connect, with the item types the EOC uses.

Generated by Claude Opus 4.816 min readNGSSS SC.912.L.18Updated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What the biochemistry and energy content demands
The properties of water
The macromolecules
Enzymes
Photosynthesis
Cellular respiration
The connection
Check your knowledge

What the biochemistry and energy content demands

The biochemistry and energy content of the Florida Biology 1 EOC is the other half of Molecular and Cellular Biology (about 35 percent of the exam, shared with the cellular content). It runs from the molecule that makes life possible (water), through the four macromolecules and the enzymes that build and break them, to the two great energy processes (photosynthesis and respiration) and how they connect. The recurring themes are energy and matter and structure and function.

This guide ties together the matching topic pages, each with its own practice questions: the properties of water, the macromolecules of life, enzymes and activation energy, photosynthesis, cellular respiration, and the photosynthesis and respiration connection.

The properties of water

Water is polar and forms hydrogen bonds, the root of its special properties: cohesion and adhesion (water rises in plants, surface tension), high specific heat (resists temperature change, stabilizing organisms and climate), solvent power (the universal solvent, so reactions and transport work), and the fact that ice floats (ice is less dense than liquid water, so it insulates the water below). When asked "why," trace the property back to polarity.

The macromolecules

Four macromolecules, each a polymer of a monomer: carbohydrates (monomer monosaccharide; quick energy; sugars and starches), lipids (fatty acids and glycerol; long-term storage and membranes), proteins (monomer amino acid; structure, enzymes, transport; shape determines function; contain nitrogen), and nucleic acids (monomer nucleotide; DNA and RNA carry genetic information; contain nitrogen and phosphorus). The monomer is the fastest way to identify a macromolecule.

Enzymes

An enzyme is a biological catalyst (a protein) that lowers activation energy and is not used up. Its active site fits a specific substrate (lock and key), giving enzymes their specificity. Because the active site depends on the protein's shape, temperature and pH affect activity: each enzyme has an optimum, and beyond it the enzyme denatures (the active site changes shape and the substrate no longer fits), so the rate falls sharply. Reading a rate-against-temperature or rate-against-pH graph is a core EOC skill.

Photosynthesis

Photosynthesis uses carbon dioxide + water + light energy to make glucose + oxygen, in the chloroplast, where chlorophyll absorbs light. It converts light energy into chemical energy in glucose and is the base of most food chains. Limiting factors (light, carbon dioxide, temperature) slow it; with no light it stops.

Cellular respiration

Cellular respiration releases the energy in glucose as ATP. Aerobic respiration (with oxygen) uses glucose + oxygen to make carbon dioxide + water + ATP, mostly in the mitochondrion. Anaerobic respiration (fermentation), without oxygen, yields much less ATP: lactic acid in human muscle, alcohol and carbon dioxide in yeast.

The connection

Photosynthesis and respiration are opposites that form a cycle: the products of one are the reactants of the other. Together they cycle matter (carbon and oxygen) while energy flows one way (light to glucose to heat). Plants do both: they photosynthesize in the light and respire all the time, a fact the EOC tests as a misconception.

The biochemistry and energy content of the Florida Biology 1 EOC covers the properties of water (polarity and hydrogen bonding give cohesion, adhesion, high specific heat, solvent power, and floating ice); the four macromolecules (carbohydrates from monosaccharides for quick energy, lipids from fatty acids and glycerol for storage and membranes, proteins from amino acids for structure and enzymes, nucleic acids from nucleotides for genetic information); enzymes as catalysts that lower activation energy and are not used up, with activity depending on temperature and pH because denaturation changes the active site; photosynthesis (carbon dioxide and water plus light give glucose and oxygen, in the chloroplast); cellular respiration (glucose and oxygen give carbon dioxide, water, and ATP aerobically; fermentation gives lactic acid in muscle or alcohol in yeast); and the interrelationship of the two, where the products of one are the reactants of the other and plants do both.

Check your knowledge

A mix of recall and reasoning questions covering biochemistry and energy. Attempt them under timed conditions, then check against the solutions.

Explain why water is called the universal solvent. (2 marks)
State why it matters for aquatic life that ice floats. (2 marks)
Name the monomer of each of the four macromolecules. (4 marks)
State what an enzyme does to the activation energy of a reaction. (1 mark)
Explain why an enzyme stops working at a very high temperature. (2 marks)
Write the word equation for photosynthesis. (2 marks)
Write the word equation for aerobic cellular respiration. (2 marks)
State what human muscle cells produce during anaerobic respiration. (1 mark)
Explain how the products of photosynthesis relate to the reactants of respiration. (2 marks)

Solutions

Q1: Water is polar, so it attracts and surrounds charged and polar particles, pulling them apart and dissolving a wide range of substances.
Q2: Ice is less dense than liquid water, so it floats and insulates the water below, keeping it liquid so organisms survive the winter.
Q3: Carbohydrate: monosaccharide. Lipid: fatty acids and glycerol. Protein: amino acid. Nucleic acid: nucleotide.
Q4: It lowers the activation energy (so the reaction goes faster).
Q5: High temperature denatures the enzyme, changing the shape of its active site so the substrate no longer fits and the reaction cannot be catalyzed.
Q6: Carbon dioxide + water + light energy gives glucose + oxygen.
Q7: Glucose + oxygen gives carbon dioxide + water + energy (ATP).
Q8: Lactic acid.
Q9: Photosynthesis produces glucose and oxygen, which are exactly the reactants of cellular respiration; the two processes are the reverse of each other.

Sources & how we know this

Next Generation Sunshine State Standards: Science (Biology 1) — Florida Department of Education (2024)
Biology 1 End-of-Course Assessment Test Item Specifications — Florida Department of Education (2024)