AP Biology Flashcards: Elements Of Life

What this deck covers

This deck focuses on Elements Of Life, giving you a quick way to review the definitions, rules, and examples that matter most for AP Biology.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is the function of ATP in the cell?

Answer: Energy currency of the cell. Stores and transfers energy through high-energy phosphate bond hydrolysis.

Flashcard 2: State the chemical formula for glucose.

Answer: $C_6H_{12}O_6$. Simple sugar with 6 carbons, 12 hydrogens, and 6 oxygens in its molecular structure.

Flashcard 3: Which macromolecule serves as the main component of cell membranes?

Answer: Phospholipids. Amphipathic molecules with hydrophilic heads and hydrophobic tails form bilayers.

Flashcard 4: Identify the type of lipid that is a major component of cell membranes.

Answer: Phospholipids. Amphipathic molecules that self-assemble into cellular membrane bilayers.

Flashcard 5: What are the four most common elements in living organisms?

Answer: Carbon, hydrogen, oxygen, nitrogen. These four elements form the backbone of all major biological macromolecules.

Flashcard 6: Which macromolecule can function as enzymes?

Answer: Proteins. Complex three-dimensional structure enables catalytic and regulatory functions.

Flashcard 7: Which type of bond holds the two strands of DNA together?

Answer: Hydrogen bonds. Weak bonds between complementary base pairs maintain double helix structure.

Flashcard 8: Identify the monomer of proteins.

Answer: Amino acids. Individual units that link together via peptide bonds to form protein chains.

Flashcard 9: Identify the amino acid that contains sulfur.

Answer: Cysteine. Only amino acid containing sulfur, forms disulfide bonds in proteins.

Flashcard 10: What is the major function of hemoglobin in the body?

Answer: Transport oxygen in the blood. Iron-containing protein carries oxygen from lungs to body tissues.

Flashcard 11: Identify the element that is a key component of chlorophyll.

Answer: Magnesium. Central metal ion in chlorophyll molecule essential for photosynthesis.

Flashcard 12: Which vitamin is essential for calcium absorption?

Answer: Vitamin D. Promotes intestinal calcium absorption and bone mineralization processes.

Flashcard 13: What element is central to all organic molecules?

Answer: Carbon. Forms four covalent bonds, creating the backbone of biological molecules.

Flashcard 14: What are the four most common elements in living organisms?

Answer: Carbon, hydrogen, oxygen, nitrogen. These four elements form the backbone of all major biological macromolecules.

Flashcard 15: What are the building blocks of lipids?

Answer: Glycerol and fatty acids. Three-carbon alcohol backbone with fatty acid chains attached forms lipid structure.

Flashcard 16: Which type of RNA carries amino acids to the ribosome?

Answer: tRNA. Transfer RNA delivers specific amino acids to growing polypeptide chains.

Flashcard 17: Identify the amino acid that contains sulfur.

Answer: Cysteine. Only amino acid containing sulfur, forms disulfide bonds in proteins.

Flashcard 18: State the chemical formula for glucose.

Answer: $C_6H_{12}O_6$. Simple sugar with 6 carbons, 12 hydrogens, and 6 oxygens in its molecular structure.

Flashcard 19: Which element is a key component of hemoglobin?

Answer: Iron. Central atom in heme group that binds oxygen for transport.

Flashcard 20: Which type of bond forms between water molecules?

Answer: Hydrogen bond. Weak attraction between hydrogen and oxygen atoms creates water's unique properties.

Flashcard 21: Identify the type of reaction that forms peptide bonds.

Answer: Dehydration synthesis. Water molecule removal creates covalent bonds between amino acid residues.

Flashcard 22: What is the chemical formula for water?

Answer: $H_2O$. Two hydrogen atoms bonded to one oxygen atom form this essential compound.

Flashcard 23: What are the building blocks of lipids?

Answer: Glycerol and fatty acids. Three-carbon alcohol backbone with fatty acid chains attached forms lipid structure.

Flashcard 24: What is the function of ATP in the cell?

Answer: Energy currency of the cell. Stores and transfers energy through high-energy phosphate bond hydrolysis.

Flashcard 25: Which type of RNA carries amino acids to the ribosome?

Answer: tRNA. Transfer RNA delivers specific amino acids to growing polypeptide chains.

Flashcard 26: Identify the type of sugar found in RNA.

Answer: Ribose. Five-carbon sugar component of RNA nucleotides, unlike DNA's deoxyribose.

Flashcard 27: Which macromolecule can function as enzymes?

Answer: Proteins. Complex three-dimensional structure enables catalytic and regulatory functions.

Flashcard 28: Which bond type is primarily responsible for the secondary structure of proteins?

Answer: Hydrogen bonds. Stabilizes alpha helices and beta sheets in protein folding patterns.

Flashcard 29: Identify the type of sugar found in RNA.

Answer: Ribose. Five-carbon sugar component of RNA nucleotides, unlike DNA's deoxyribose.

Flashcard 30: What is the main role of cholesterol in the cell membrane?

Answer: Stabilize membrane fluidity. Maintains optimal membrane viscosity across different temperature conditions.

Flashcard 31: Which bond type is primarily responsible for the secondary structure of proteins?

Answer: Hydrogen bonds. Stabilizes alpha helices and beta sheets in protein folding patterns.

Flashcard 32: What is the function of glycogen in animals?

Answer: Short-term energy storage. Branched glucose polymer stored in liver and muscle for quick energy.

Flashcard 33: Which type of bond forms between water molecules?

Answer: Hydrogen bond. Weak attraction between hydrogen and oxygen atoms creates water's unique properties.

Flashcard 34: What type of macromolecule are antibodies?

Answer: Proteins. Complex protein structures that recognize and neutralize foreign antigens.

Flashcard 35: What is the role of nucleic acids in cells?

Answer: Store and transmit genetic information. DNA and RNA carry hereditary instructions and enable protein synthesis.

Flashcard 36: Identify the monomer of nucleic acids.

Answer: Nucleotides. Individual units containing sugar, phosphate, and nitrogenous base components.

Flashcard 37: Identify the primary structure of proteins.

Answer: Sequence of amino acids. Linear arrangement of amino acids determines all higher-level protein structures.

Flashcard 38: Which vitamin is essential for calcium absorption?

Answer: Vitamin D. Promotes intestinal calcium absorption and bone mineralization processes.

Flashcard 39: Identify the sugar found in DNA.

Answer: Deoxyribose. Five-carbon sugar lacking one hydroxyl group compared to ribose.

Flashcard 40: Identify the element that is a key component of chlorophyll.

Answer: Magnesium. Central metal ion in chlorophyll molecule essential for photosynthesis.

Flashcard 41: Which macromolecule is responsible for storing energy long-term?

Answer: Lipids. High energy density makes fats ideal for extended energy storage needs.

Flashcard 42: What is the function of enzymes in biological reactions?

Answer: Catalysts that speed up reactions. Lower activation energy by binding substrates and stabilizing transition states.

Flashcard 43: What is the primary function of the rough endoplasmic reticulum?

Answer: Protein synthesis. Ribosomes attached to ER translate proteins destined for secretion or membranes.

Flashcard 44: Which element is found in the structure of ATP?

Answer: Phosphorus. Essential component of phosphate groups in ATP's energy-storing bonds.

Flashcard 45: What element is central to all organic molecules?

Answer: Carbon. Forms four covalent bonds, creating the backbone of biological molecules.

Flashcard 46: Which element is a key component of hemoglobin?

Answer: Iron. Central atom in heme group that binds oxygen for transport.

Flashcard 47: Identify the sugar found in DNA.

Answer: Deoxyribose. Five-carbon sugar lacking one hydroxyl group compared to ribose.

Flashcard 48: What is the function of the mitochondrial matrix?

Answer: Site of the Krebs cycle. Inner compartment where citric acid cycle reactions occur during respiration.

Flashcard 49: What is the role of nucleic acids in cells?

Answer: Store and transmit genetic information. DNA and RNA carry hereditary instructions and enable protein synthesis.

Flashcard 50: What is the process of protein synthesis called?

Answer: Translation. Process where ribosomes read mRNA to assemble amino acids into proteins.

Flashcard 51: Which type of carbohydrate is a primary energy source?

Answer: Monosaccharides. Simple sugars like glucose are rapidly metabolized for immediate energy.

Flashcard 52: Identify the monomer of proteins.

Answer: Amino acids. Individual units that link together via peptide bonds to form protein chains.

Flashcard 53: Which element is found in the structure of ATP?

Answer: Phosphorus. Essential component of phosphate groups in ATP's energy-storing bonds.

Flashcard 54: Identify the primary structure of proteins.

Answer: Sequence of amino acids. Linear arrangement of amino acids determines all higher-level protein structures.

Flashcard 55: Which type of carbohydrate is a primary energy source?

Answer: Monosaccharides. Simple sugars like glucose are rapidly metabolized for immediate energy.

Flashcard 56: What is the major function of hemoglobin in the body?

Answer: Transport oxygen in the blood. Iron-containing protein carries oxygen from lungs to body tissues.

Flashcard 57: Identify the monomer of nucleic acids.

Answer: Nucleotides. Individual units containing sugar, phosphate, and nitrogenous base components.

Flashcard 58: Which macromolecule is responsible for storing energy long-term?

Answer: Lipids. High energy density makes fats ideal for extended energy storage needs.

Flashcard 59: What is the main structural component of plant cell walls?

Answer: Cellulose. Complex polysaccharide providing structural rigidity and protection to plant cells.

Flashcard 60: What is the main structural component of plant cell walls?

Answer: Cellulose. Complex polysaccharide providing structural rigidity and protection to plant cells.

Flashcard 61: Identify the molecule that acts as a messenger carrying instructions from DNA.

Answer: mRNA. Transfers genetic information from nucleus to ribosomes for protein synthesis.

Flashcard 62: What type of macromolecule are antibodies?

Answer: Proteins. Complex protein structures that recognize and neutralize foreign antigens.

Flashcard 63: What is the process of protein synthesis called?

Answer: Translation. Process where ribosomes read mRNA to assemble amino acids into proteins.

Flashcard 64: What is the function of glycogen in animals?

Answer: Short-term energy storage. Branched glucose polymer stored in liver and muscle for quick energy.

Flashcard 65: What is the chemical formula for water?

Answer: $H_2O$. Two hydrogen atoms bonded to one oxygen atom form this essential compound.

Flashcard 66: Identify the type of reaction that forms peptide bonds.

Answer: Dehydration synthesis. Water molecule removal creates covalent bonds between amino acid residues.

Flashcard 67: Identify the type of lipid that is a major component of cell membranes.

Answer: Phospholipids. Amphipathic molecules that self-assemble into cellular membrane bilayers.

Flashcard 68: Which macromolecule serves as the main component of cell membranes?

Answer: Phospholipids. Amphipathic molecules with hydrophilic heads and hydrophobic tails form bilayers.

Flashcard 69: What are the components of a nucleotide?

Answer: Sugar, phosphate group, nitrogenous base. Basic building blocks that link together to form nucleic acid chains.

Flashcard 70: Identify the molecule that acts as a messenger carrying instructions from DNA.

Answer: mRNA. Transfers genetic information from nucleus to ribosomes for protein synthesis.

Flashcard 71: Identify the bond that links nucleotides in DNA.

Answer: Phosphodiester bond. Covalent bond between phosphate and sugar creates DNA's sugar-phosphate backbone.

Flashcard 72: What are the components of a nucleotide?

Answer: Sugar, phosphate group, nitrogenous base. Basic building blocks that link together to form nucleic acid chains.

Flashcard 73: What is the function of enzymes in biological reactions?

Answer: Catalysts that speed up reactions. Lower activation energy by binding substrates and stabilizing transition states.

Flashcard 74: What is the primary function of carbohydrates in cells?

Answer: Energy storage and supply. Carbohydrates like glucose provide immediate fuel for cellular processes.

Flashcard 75: What is the primary function of the rough endoplasmic reticulum?

Answer: Protein synthesis. Ribosomes attached to ER translate proteins destined for secretion or membranes.