Molecules Support Growth
Help Questions
Middle School Life Science › Molecules Support Growth
A model of a growing puppy shows many small molecules inside the puppy. Arrows show small molecules being connected into larger structures in muscles and bones. Before: fewer larger structures are shown. After: more larger structures are shown as part of new tissue. The model includes the sentence: “Rearranged molecules support growth and repair.”
Which prediction is supported by the model if the puppy does not get enough small molecules from its surroundings (for example, not enough food/water molecules entering the body)?
The puppy will still grow normally because growth happens without input of molecules; time alone causes new tissue to appear.
Growth and repair will slow down because there are fewer small molecules available to rearrange into the larger structures that make new tissue.
Growth will speed up because the body will create new matter to replace missing molecules.
The puppy will grow normally because the body can reuse the same small molecules forever without needing any new ones.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as a puppy developing muscles and bones. Small molecules inside the puppy, sourced from food and water, are rearranged and linked to form larger molecules that contribute to new tissues in growing areas. Models illustrate this by depicting small molecules as dots that are assembled into chains or structures, with arrows showing their integration into muscles and bones. To check your understanding, predict outcomes like slowed growth if molecule input decreases, and compare with the model's before-and-after depictions. A common misconception is that growth continues normally without new molecules, but it actually requires ongoing input to rearrange into tissues. Since matter is conserved, the atoms from ingested small molecules become part of the larger structures without disappearance or creation. This conserved matter principle enables animals like puppies to sustain growth and repair over time.
A model of muscle growth after exercise shows small molecules inside the organism. Arrows show small molecules being assembled into larger structures in muscle tissue. Before: fewer larger structures are shown in the muscle. After: more larger structures are shown and the muscle tissue is repaired and grown. The model states: “Rearranged molecules support growth and repair.”
What happens to molecules during this growth and repair, according to the model?
Molecules turn into energy, and the energy itself becomes muscle tissue without needing molecules to assemble.
The muscle grows because it fills with empty space; molecules are not part of the new tissue.
The muscle grows because the body makes new matter from nothing when it needs to repair.
Small molecules are rearranged and joined into larger structures that become part of repaired and grown muscle tissue.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as muscles developing after exercise. Small molecules inside the body are rearranged and assembled into larger molecules that repair and enlarge muscle tissues. Models show this process with arrows connecting small molecule dots into bigger structures, comparing fewer to more structures before and after. To check your understanding, analyze what the model indicates happens to molecules during assembly, ensuring it aligns with building rather than conversion to energy. A common misconception is that energy directly becomes tissue without molecules, but growth requires rearranging them into structured forms. Since matter is conserved, atoms from small molecules integrate into larger ones without disappearing. This conservation principle supports muscle growth and repair in active organisms.
A student says, “If an organism grows, it must be because it got bigger, so growth is just stretching what was already there.” A model shows before many small molecules inside the organism, then arrows showing those small molecules assembled into larger structures, and after new tissue has formed (growth/repair). The model includes the statement: “Rearranged molecules support growth and repair.”
Which claim about growth is incorrect based on the model?
Repair and growth require rearranging matter; matter is not created from nothing in the model.
The before-and-after model suggests that new tissue contains larger structures that were assembled from smaller molecules.
Growth is only stretching existing material; molecules do not need to be rearranged into larger structures to add new tissue.
Growth can involve building new body material by assembling small molecules into larger structures.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as general tissue formation in growing bodies. Small molecules inside the organism are rearranged and built into larger molecules that contribute to new tissues during growth. Models illustrate this by showing small dots assembled into larger structures via arrows, with before-and-after views depicting added tissue. To check your understanding, identify incorrect claims by comparing them to the model's emphasis on molecular rearrangement over stretching. A common misconception is that growth is merely stretching existing material without new molecular input, but it involves assembling larger structures. Because matter is conserved, no new matter is created; existing atoms are reorganized into tissues. This conserved matter allows organisms to support sustained growth and repair processes.
A simplified model shows skin repair after a scrape. Before: small molecules are shown inside the body. The model shows them being assembled into larger structures at the scrape. After: the scrape is covered with repaired skin tissue. The caption states, “Rearranged molecules support growth and repair.”
Which claim about the model is incorrect?
The model suggests that molecules in the organism can be rearranged and built into larger structures during repair.
The model supports the idea that repair adds body material by assembling small molecules into larger structures.
The before-and-after comparison indicates that the repaired area contains larger structures that were not shown there before.
The model shows that the scrape heals because healing energy alone fills in the missing skin, without assembling molecules into new structures.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as skin healing after a scrape. Small molecules within the body are rearranged and assembled into larger molecules that help rebuild damaged tissues like skin layers. Models commonly show this process with small molecules as individual dots being connected into bigger chains or blocks at the injury site, demonstrating the formation of repaired structures. To check your understanding, review the model's before-and-after views to confirm that repair involves molecular building rather than just energy filling gaps. A common misconception is that healing occurs through energy alone without molecular assembly, but actually, it depends on rearranging existing molecules into new tissue structures. Because matter is conserved, no new atoms are created; instead, those from small molecules integrate into the larger ones for repair. This conservation of matter ensures organisms can effectively support growth and repair using internal and environmental resources.
A model shows a child’s broken bone repairing. Before: the bone is cracked, and small molecules are shown inside the body. The model shows small molecules being assembled into larger structures at the crack. After: the crack is filled in with new bone tissue. The model includes: “Rearranged molecules support growth and repair.”
Which evidence from the model best supports the idea that matter is conserved during repair (matter does not appear from nowhere or disappear)?
The model shows that repair happens because healing energy fills the crack without using molecules.
The model shows the crack disappears, so the matter from the crack must have vanished.
The model shows small molecules already inside the body being connected into larger structures that become part of the repaired bone.
The model shows the bone looks smoother after repair, so it must have gained matter.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as a child's bone healing after a break. Small molecules inside the body are rearranged and assembled into larger molecules that fill in and strengthen the cracked bone tissue. Models depict this by showing small molecules as dots being connected into larger structures at the fracture site, with before-and-after views highlighting the repair. To check your understanding, look for evidence in the model that matter is neither created nor destroyed, such as consistent molecule counts during assembly. A common misconception is that matter vanishes or appears during repair, but it is actually conserved through rearrangement into new forms. Since matter is conserved, the atoms in small molecules become integral to the larger bone structures without any net change in matter. This principle allows the body to support effective growth and repair in bones and other tissues.
A simplified model shows a starfish regrowing an arm. Before: the arm is missing, and small molecules are shown inside the starfish. The model shows these small molecules moving to the missing-arm area and being connected into larger structures. After: a new arm is present and contains the larger structures. The model states: “Rearranged molecules support growth and repair.”
Which evidence-based explanation is best supported by the model?
The new arm forms because the starfish remembers the shape of an arm, so the arm appears without needing molecules to build it.
The new arm forms because the small molecules are used once and then disappear, so they cannot be part of the new tissue.
The new arm forms because small molecules inside the starfish are rearranged and assembled into larger structures that become the new arm tissue.
The new arm forms because the model’s connected dots randomly stick together without any relation to growth or repair.
Explanation
The core skill is understanding how molecules support the growth and repair of living organisms, such as a starfish regenerating a lost arm. Small molecules inside the starfish are rearranged and assembled into larger molecules that form the new arm tissue. Models depict this by showing small molecules as dots moving and connecting into bigger structures at the regeneration site, with before-and-after comparisons. To check your understanding, evaluate explanations against the model to ensure they highlight molecular assembly as evidence. A common misconception is that regeneration occurs without molecules, like through memory or random sticking, but it requires purposeful rearrangement. Since matter is conserved, atoms from small molecules are preserved in the larger structures of the new arm. This principle of conserved matter enables remarkable repair and growth in organisms like starfish.
A model shows a fish repairing a torn fin. In the before panel, small molecules are shown inside the fish near the tear. Arrows show them being assembled into larger structures that fill the torn area. In the after panel, the fin is whole again. The model states: “Rearranged molecules support growth and repair.”
Which claim about the model is incorrect?
The before-and-after panels show a change in the fin that can be explained by building new tissue from molecules already in the body.
Repair happens when small molecules are rearranged and built into larger structures that become fin tissue.
The fin repairs because the fish creates brand-new matter, so the small molecules do not need to come from anywhere.
The arrows suggest that molecules are connected into larger structures during repair.
Explanation
The core concept in middle school life science is that molecules support the growth and repair of living organisms by providing the building blocks for new tissues. Small molecules, such as those from food, are rearranged inside the body to form the complex structures needed for healing processes like repairing a torn fin in a fish. Models demonstrate this by using arrows to illustrate how small molecule pieces are connected into longer chains and stacked layers that fill in damaged areas and create new tissue. To check your understanding, count the small molecules in the before panel and ensure they match the components in the larger structures of the after panel, confirming no matter is created or destroyed. A common misconception is that repair involves creating brand-new matter, but in reality, all new tissue comes from rearranging existing molecules. Conserved matter ensures that organisms can repair themselves efficiently without needing to produce matter anew. This principle of matter conservation supports both growth and repair across all living things, allowing for sustainable development and recovery.
A model shows a young bird growing. In the before panel, small molecules are shown inside the bird’s body. Arrows show these small molecules being linked and packed into thicker structures in the wing. In the after panel, the wing has more tissue than before. The model states: “Rearranged molecules support growth and repair.”
Which evidence from the model supports the idea that growth happens by rearranging molecules into larger structures (not just getting bigger in size)?
The model uses arrows to show small molecules being assembled into larger structures that become additional wing tissue.
The bird can grow without any input of molecules because bodies can create new matter during growth.
The after panel shows a bigger-looking wing, so growth must mean size increased even if molecules did not change.
The model label is enough to prove growth, even without showing molecules being connected.
Explanation
The core concept in middle school life science is that molecules support the growth and repair of living organisms by providing the building blocks for new tissues. Small molecules, such as those from food, are rearranged inside the body to form the complex structures needed for processes like wing growth in a young bird. Models demonstrate this by using arrows to illustrate how small molecule pieces are connected into longer chains and stacked layers that add tissue and enable expansion. To check your understanding, count the small molecules in the before panel and ensure they match the components in the larger structures of the after panel, confirming no matter is created or destroyed. A common misconception is that growth is just about increasing size without molecular changes, but actually, it involves building new structures from rearranged molecules. Conserved matter ensures that organisms can grow efficiently without needing to produce matter anew. This principle of matter conservation supports both growth and repair across all living things, allowing for sustainable development and recovery.
A model shows a mouse growing new fur after a bald patch. In the before panel, small molecules are shown inside the mouse under the skin. Arrows show small molecules being assembled into larger structures that form a new layer in the skin. In the after panel, the bald patch is covered. The model states: “Rearranged molecules support growth and repair.”
Which supported statement best explains what happens to molecules during this repair?
Small molecules are rearranged into larger structures that become part of new skin and fur, so matter is reused in the body.
Repair happens because the mouse’s skin stretches to cover the patch, so no new structures are built.
The molecules are not part of the repair; the body heals because energy alone fills in the bald patch.
The molecules in the model are only labels to memorize; they do not represent real matter in the mouse.
Explanation
The core concept in middle school life science is that molecules support the growth and repair of living organisms by providing the building blocks for new tissues. Small molecules, such as those from food, are rearranged inside the body to form the complex structures needed for processes like growing new fur in a mouse. Models demonstrate this by using arrows to illustrate how small molecule pieces are connected into longer chains and stacked layers that add tissue and enable recovery. To check your understanding, count the small molecules in the before panel and ensure they match the components in the larger structures of the after panel, confirming no matter is created or destroyed. A common misconception is that energy alone can heal without molecules, but actually, molecules are essential building pieces. Conserved matter ensures that organisms can repair efficiently without needing to produce matter anew. This principle of matter conservation supports both growth and repair across all living things, allowing for sustainable development and recovery.
A model shows a tadpole growing a longer tail. In the before panel, small molecules are shown inside the tadpole. Arrows show the molecules being assembled into larger structures in the tail region. In the after panel, the tail has more tissue. The model states: “Rearranged molecules support growth and repair.”
Which statement is supported by the model about what happens to molecules during growth?
The tail grows because it stretches longer; the same amount of tissue is just spread out.
Small molecules are rearranged and built into larger structures that become new tail tissue, meaning molecules are reused as building material.
The tail grows because the molecules randomly bump together, so no organized building is needed.
The tail grows because the tadpole creates new matter, so molecules inside the body do not need to change.
Explanation
The core concept in middle school life science is that molecules support the growth and repair of living organisms by providing the building blocks for new tissues. Small molecules, such as those from food, are rearranged inside the body to form the complex structures needed for growth processes like lengthening a tail in a tadpole. Models demonstrate this by using arrows to illustrate how small molecule pieces are connected into longer chains and stacked layers that add tissue. To check your understanding, count the small molecules in the before panel and ensure they match the components in the larger structures of the after panel, confirming no matter is created or destroyed. A common misconception is that growth is just stretching existing tissue, but actually, it builds new structures from molecules. Conserved matter ensures that organisms can grow efficiently without needing to produce matter anew. This principle of matter conservation supports both growth and repair across all living things, allowing for sustainable development and recovery.