Molecules Support Growth - Middle School Life Science

Which macromolecule is rearranged to make new cell membranes during growth and repair?

Lipids (especially phospholipids). Phospholipids form the bilayer structure of membranes.
Identify the molecule type most directly used to replace a damaged cell membrane.

Phospholipids (lipids) and membrane proteins. Cell membranes have a phospholipid bilayer with embedded proteins.
What is the name of the process that breaks down molecules into smaller units?

Catabolism. This metabolic process releases energy by degrading complex molecules.
What is the key difference between digestion and cellular synthesis in growth and repair?

Digestion breaks molecules down; synthesis builds new molecules from smaller units. Digestion is catabolic; synthesis is anabolic.
What is the immediate energy-carrying molecule cells use to power building reactions?

ATP. Adenosine triphosphate stores energy in phosphate bonds.
Which cell structure uses amino acids to assemble proteins needed for growth and repair?

Ribosomes. Protein synthesis sites that read genetic instructions.
Which organelle releases energy from food molecules to make ATP for repair processes?

Mitochondria. Cellular respiration converts glucose to ATP.
Which cellular process breaks down large molecules into smaller ones that can be reused?

Catabolism. Breaking down releases building blocks for reuse.
What are the smaller building blocks (monomers) of lipids commonly called in middle school biology?

Fatty acids and glycerol. Combine to form fats for energy storage and membranes.
What is the main purpose of rearranging molecules in the body during repair?

To replace damaged cell parts and rebuild tissues using new molecules. Molecules rebuild damaged structures back to healthy state.
Which organelle is the primary site of protein assembly for growth and repair?

Ribosomes. mRNA brings instructions to ribosomes for translation.
What is homeostasis, and how does growth and repair help maintain it?

Stable internal conditions; repair replaces damaged parts to keep systems working. Homeostasis maintains balance; repair fixes disruptions.
Which building blocks are rearranged to make proteins used in growth and repair?

Amino acids. 20 different amino acids combine in various sequences.
What cell process builds large molecules from small molecules to support growth and repair?

Anabolism (biosynthesis). This metabolic process assembles small molecules into larger ones.
Identify the best description of how eating protein supports wound healing.

It supplies amino acids to build new proteins for new tissue and clotting. Amino acids from dietary protein rebuild damaged tissue.
What type of nutrient provides amino acids used to build proteins for tissue repair?

Proteins (digested into amino acids). Proteins break down into amino acids during digestion.
What is meant by molecules being rearranged during growth and repair in an organism?

Atoms are recombined to form new molecules needed by cells. Chemical bonds break and reform to create different compounds.
Which statement is correct: atoms are created during growth, or atoms are rearranged during growth?

Atoms are rearranged during growth. Matter cannot be created or destroyed, only rearranged.
What are the smaller building blocks that cells link together to make proteins?

Amino acids. 20 types combine in chains to form all proteins.
What is the role of enzymes in rearranging molecules for growth and repair?

They speed up chemical reactions that build and break molecules. Biological catalysts make reactions happen faster.
Which macromolecule provides genetic instructions that guide building proteins for repair?

DNA. DNA codes for proteins needed in cellular repair.
Which process releases energy from food molecules so cells can build new molecules?

Cellular respiration. Breaks down glucose to produce ATP for biosynthesis.
What are the smaller building blocks (monomers) of proteins called?

Amino acids. Link together to form proteins for growth and repair.
What is meant by rearranging molecules during digestion and cell building?

Breaking food molecules and rebuilding them into new body molecules. Atoms from food are reorganized into body structures.
Which cellular process builds large molecules from smaller ones for growth and repair?

Anabolism (biosynthesis). Building complex molecules from simple ones requires energy.
What is the main idea of the law of conservation of matter in growth and repair?

Atoms are rearranged, not created or destroyed. Matter changes form but total mass stays constant.
Choose the best match: DNA instructions → ribosome action → produced molecule is a ___.

protein. Ribosomes synthesize proteins based on genetic instructions.
Which type of chemical reaction forms a larger molecule by joining smaller subunits?

Dehydration synthesis (condensation). Water is removed when monomers bond together.
What is the name of the process that builds larger molecules from smaller ones for growth?

Anabolism. This metabolic process synthesizes complex molecules from simpler ones.
What is the main function of proteins in growth and repair?

They build and repair structures and act as enzymes and transporters. Proteins form structural components and catalyze reactions.
What is the name of the process that links amino acids to form a protein?

Protein synthesis. Ribosomes join amino acids in sequence to make proteins.
Which macromolecule is commonly used for long-term energy storage that can support growth needs?

Lipids (fats). Store concentrated energy for later growth needs.
Which cellular process makes an exact copy of DNA before cell division for growth and repair?

DNA replication. This process ensures each daughter cell gets identical genetic material.
Which option best completes the statement: Repair requires enzymes to ___ chemical bonds.

break and form. Enzymes catalyze both bond cleavage and bond formation.
Which type of biomolecule is most directly used to build and repair body structures such as muscle?

Proteins. These polymers form structural components and enzymes in tissues.
Which option best describes why energy is needed for growth and repair: breaking bonds or building bonds?

Building bonds requires energy input. Forming chemical bonds is endergonic (requires energy).
What is the main purpose of rearranging molecules in the body during growth?

To build new cells and increase body mass by making new biomolecules. New molecules form cellular components for organism growth.
What does it mean to say molecules are rearranged during growth and repair?

Atoms are recombined into new molecules with new structures and functions. Chemical bonds break and reform to create different molecular structures.
Which macromolecule type is most directly used to build and repair body structures?

Proteins. Made of amino acids, they form structural and functional components.
Identify the correct sequence for building a protein: amino acids → ___ → protein.

polypeptide (amino acid chain). Peptide bonds link amino acids into this linear chain.
Which option best explains what happens to food molecules in the body: used as-is or broken and rebuilt?

They are broken down and rebuilt into the body's own molecules. Digestion breaks down food; cells reassemble nutrients into body molecules.
What is the role of enzymes in rearranging molecules in digestion and synthesis?

They speed up chemical reactions that break and build molecules. Act as catalysts to enable molecular transformations.
What is the main purpose of cell division during tissue repair after an injury?

To replace damaged or dead cells with new cells. New cells restore tissue function and structure.
What is the role of enzymes in rearranging molecules during growth and repair?

They speed up chemical reactions that break and form chemical bonds. Enzymes are biological catalysts that lower activation energy.
Which macromolecule is most directly used to build new muscle and many cell structures?

Proteins. Proteins form structural components and enzymes.
Which macromolecule provides quick energy that can power cell division and repair processes?

Carbohydrates. Break down rapidly to fuel cell activities.
What is the relationship between chemical bonds and molecular rearrangement?

Reactions break old bonds and form new bonds to create new molecules. Energy is stored in bonds and released when bonds break.
What is the main function of carbohydrates in supporting growth and repair?

They provide energy and carbon skeletons for building molecules. Glucose breakdown provides ATP and carbon atoms.
What is the name of the process that builds larger molecules from smaller units in cells?

Synthesis. Combines small molecules into larger ones for body use.
Which type of chemical reaction breaks a polymer into monomers that can be reused?

Hydrolysis. Water splits bonds between monomers in polymers.
What are the smaller building blocks (monomers) of carbohydrates called?

Simple sugars (monosaccharides). Single sugar units that combine to form larger carbs.
Which option best explains how a cut heals using rearranged molecules?

Cells synthesize new proteins and membranes to replace damaged tissue. New molecules rebuild tissue structure during healing.
What is ATP, and why is it important for rearranging molecules in cells?

ATP is the cell's main energy molecule that powers building and repair reactions. ATP provides energy by breaking high-energy phosphate bonds.
What is the name of the process that breaks large food molecules into smaller units?

Digestion. Breaks down complex food into absorbable units.
Which cell structure is the main site of protein synthesis used for growth and repair?

Ribosomes. Assemble amino acids into proteins following DNA code.
What is the main function of DNA in growth and repair?

It stores instructions for making proteins needed by cells. DNA contains genes that code for protein sequences.
What is the role of DNA in making the proteins needed for growth and repair?

DNA provides the instructions for protein building. Contains genetic code that directs protein assembly.
What is the role of enzymes in rearranging molecules during growth and repair?

They speed up and control chemical reactions that build or remodel molecules. Enzymes catalyze reactions without being consumed.
Which biomolecule provides quick energy that cells can use to power repair processes?

Carbohydrates (such as glucose). These molecules undergo cellular respiration to produce ATP.
Which organelle modifies and packages proteins used for cell repair and export?

Golgi apparatus. Adds sugars and lipids to proteins before transport.
Which option best describes how cell division contributes to growth after molecules are built?

Cells divide to increase cell number using newly made cell materials. Mitosis produces more cells from synthesized materials.
What type of nutrient provides fatty acids used to build cell membranes during growth?

Lipids (fats and oils). Cell membranes consist mainly of phospholipids made from fatty acids.
What type of nutrient commonly provides glucose used for energy to power repair reactions?

Carbohydrates. Glucose from carbohydrates produces ATP through cellular respiration.
Which option best explains why a growing cell must make more phospholipids: to enlarge its membrane, to copy DNA, to store water, or to digest food?

To enlarge its membrane. Cell membranes must expand as cells grow larger.
Identify the best reason a broken bone needs calcium and phosphate: to make DNA, to build mineral, to make enzymes, or to make glucose.

To build mineral (bone matrix) for repair. Calcium phosphate forms the hard structure of bones.
Which biomolecule forms cell membranes and must be made for new cells during growth?

Lipids (phospholipids). These molecules have hydrophobic tails and hydrophilic heads.
Which macromolecule stores genetic instructions that guide building proteins for repair?

DNA. Contains blueprints for all proteins cells can make.
Which option best completes the statement: Mitosis supports growth by increasing the number of ___.

cells. Cell proliferation increases tissue mass during development.
What is the primary function of DNA during growth and repair?

It stores instructions for making proteins needed for new cells and repair. DNA contains genetic code that directs protein synthesis.
What are the building blocks (monomers) that cells link together to make proteins?

Amino acids. These organic compounds contain an amino group and carboxyl group.
Which option best describes why eating protein helps heal a cut: energy only, amino acids, oxygen, or water?

Amino acids. Proteins in food provide amino acids for new tissue.
What is mitosis, and how does it support growth and repair?

Cell division that produces two identical body cells for growth and tissue repair. This process maintains chromosome number in somatic cells.
What is the main purpose of rearranging molecules during growth and repair?

To build new cell parts and replace damaged structures. New molecules form cellular components and fix damage.
What is the main source of atoms used to build new body tissues during growth and repair?

Nutrients from food (and water) that supply atoms for new molecules. The body cannot create atoms; it must obtain them from external sources.
Identify the molecule type most directly used to rebuild torn muscle fibers after exercise.

Proteins (amino acids assembled into muscle proteins). Muscle fibers contain actin and myosin proteins.
What is the main reason vitamins and minerals can be important for growth and repair?

They act as enzyme helpers and are needed to build certain tissues. Many vitamins are coenzymes; minerals form structural components.
What is the main function of ATP in growth and repair at the cellular level?

It provides usable energy to power biosynthesis and cell work. ATP releases energy when its phosphate bonds break.
What is meant by the phrase "rearranged molecules" in growth and repair?

Atoms are reorganized into new molecules with different structures and functions. During growth, existing molecules break apart and reform into new structures.
What cell process makes new cells for growth and to replace damaged cells?

Mitosis (cell division). Mitosis produces two identical daughter cells from one parent cell.
What is meant by "rearranged molecules" during growth and repair in an organism?

Atoms are recombined into new molecules that build body structures. Food molecules are broken down and reassembled into body components.
Which option best explains why atoms are conserved during growth and repair?

Atoms are rearranged into new molecules; they are not created or destroyed. Matter is conserved; only molecular arrangements change.
Which type of molecule is most directly used to build and repair body structures such as muscle?

Proteins. Made of amino acids that form structural tissues.
What is the role of enzymes in rearranging molecules for growth and repair?

They speed up chemical reactions that build and break molecules. Enzymes catalyze both synthesis and breakdown reactions.
Identify the best description of how food molecules support repair after digestion.

Digestion yields small molecules that cells rebuild into needed body molecules. Nutrients are broken down then reassembled for body use.
Which organelle is the main site where cells assemble amino acids into proteins?

Ribosomes. These cellular structures translate mRNA into polypeptide chains.

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