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Biology: explore STEM content (page 46 of 50) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Biology Biology groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Biology

Cells, genetics, ecology and physiology on openstem — flashcards, notes, quizzes, sketches and flowcharts shared by the community. Study free, or clone anything into your library.

Content Groups1

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Flashcards9 cards

What is a cutting?1 / 9

A cutting is a small piece cut from a plant, such as a piece of stem, that can grow into a brand-new plant.

Biology

Biology · L1 · Growing New Plants from Cuttings

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Biology · L1 · Growing New Plants from Cuttings

Plot1 plot · 2 params

Biology

Biology · L3 · Exponential Decay (Drug Clearance)

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Biology · L3 · Exponential Decay (Drug Clearance)

Flowchart9 objects

Biology

Biology · L2 · Discovering a New Species · flowchart

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Biology · L2 · Discovering a New Species · flowchart

Note~642 words · 3 min

Vaccine History and Herd Immunity Vaccination is one of the most successful ideas in the history of medicine, and it began with a single careful observation in the English countryside. This note traces that story from Edward Jenner's 1796 e

Biology

Biology · L3 · Vaccine History and Herd Immunity

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Biology · L3 · Vaccine History and Herd Immunity

Flowchart9 objects

Biology

Biology · L2 · How Canning Preserves Food

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Biology · L2 · How Canning Preserves Food

Flashcards9 cards

What is a cell wall?1 / 9

The cell wall is a rigid layer made mostly of a tough material called cellulose, found just outside the cell membrane in plant cells.

Biology

Biology · L2 · What Makes Plant Cells Different

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Biology · L2 · What Makes Plant Cells Different

Flowchart9 objects

Biology

Sorting Animals Into Groups · flowchart

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Sorting Animals Into Groups · flowchart

Flashcards10 cards

What is a decomposer, and why are fungi important decomposers in most ecosystems?1 / 10

A decomposer is an organism that breaks down dead organic matter into simpler substances. Fungi are especially important decomposers because their enzymes can break down tough materials like wood and leaf litter that few other organisms can digest, releasing the nutrients locked inside back into the ecosystem.

Biology

Biology · L3 · Fungal Roles: Decomposers, Partners, and Pathogens

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Biology · L3 · Fungal Roles: Decomposers, Partners, and Pathogens

Flowchart5 objects

Biology

Biology · L2 · Invertebrate Diversity Quiz · flowchart

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Biology · L2 · Invertebrate Diversity Quiz · flowchart

Collection5 items

01Biology · L3 · The Taxonomic Hierarchy and Binomial Nomenclature

02Biology · L3 · The Three Domains and Phylogenetic Trees

03Biology · L3 · Taxonomy and Classification Quiz

+2 more

Biology

Biology · L3 · Taxonomy and Classification

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Biology · L3 · Taxonomy and Classification

Flowchart11 objects

Biology

Biology · L3 · Allergies and Autoimmune Disease: When Immunity Misfires · flowchart

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Biology · L3 · Allergies and Autoimmune Disease: When Immunity Misfires · flowchart

Note~428 words · 2 min

Plant Defenses and Adaptations A plant cannot flee a hungry herbivore the way an animal can run from a predator, so plants have evolved a range of strategies to avoid being eaten instead: physical barriers that make biting difficult, chemic

Biology

Biology · L3 · Plant Defenses and Adaptations

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Biology · L3 · Plant Defenses and Adaptations

Collection5 items

01Biology · L2 · How a Microscope Magnifies the Tiny World

02Biology · L2 · The Discovery of Cells and Cell Theory

03Biology · L2 · Timeline: From Hooke's Cork to Cell Theory

+2 more

Biology

Biology · L2 · Discovering Cells

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Biology · L2 · Discovering Cells

Flashcards9 cards

What is herd immunity?1 / 9

Herd immunity happens when enough people in a community are immune to a disease — usually through vaccination — that the disease has a hard time spreading, even to people who are not immune.

Biology

Biology · L2 · What Is Herd Immunity?

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Biology · L2 · What Is Herd Immunity?

Flowchart11 objects

Biology

Biology · L3 · Nephron Filtration and Urine Formation

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Biology · L3 · Nephron Filtration and Urine Formation

Flowchart9 objects

Biology

Biology · L2 · A Simple Reflex Path

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Biology · L2 · A Simple Reflex Path

Flashcards10 cards

What is a nerve?1 / 10

A nerve is like a wire made of many thin fibres that carries messages, called nerve signals, between the brain and the rest of the body.

Biology

Biology · L2 · Nerves and Reflexes

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Biology · L2 · Nerves and Reflexes

Quiz5 questions

Which of the Big Five mass extinctions is often called the 'Great Dying' because it was the most severe, killing up to 96% of marine species?

AThe Cretaceous–Paleogene (K-Pg) extinctionBThe Permian–Triassic extinctionCThe Late Devonian extinctionDThe Ordovician–Silurian extinction

Biology

Biology · L3 · Mass Extinction and Adaptive Radiation Quiz

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Biology · L3 · Mass Extinction and Adaptive Radiation Quiz

Quiz5 questions

Are whales and dolphins fish or mammals?

AFishBMammalsCAmphibiansDReptiles

Biology

Biology · L1 · Why Whales Must Surface to Breathe Quiz

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Biology · L1 · Why Whales Must Surface to Breathe Quiz

Collection4 items

01Biology · L1 · Animal Groups: Mammals, Birds and Fish

02Biology · L1 · Animal Groups: Reptiles, Amphibians and Insects

03Biology · L1 · Animal Groups

+1 more

Biology

Biology · L1 · Animal Groups

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Biology · L1 · Animal Groups

Note~1032 words · 5 min

Immunology The adaptive immune system relies on a small set of recognition tools — antibodies, MHC molecules, and the T cells that read them — working together with an ancient enzymatic cascade, the complement system, to detect and destroy

Biology

Biology · L4 · Immunology

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Biology · L4 · Immunology

Flowchart11 objects

Biology

Biology · L5 · Immune Tolerance and Cytokine Signalling Networks · flowchart

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Biology · L5 · Immune Tolerance and Cytokine Signalling Networks · flowchart

Flowchart7 objects

Biology

Biology · L2 · The Three Bacteria Shapes at a Glance · flowchart

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Biology · L2 · The Three Bacteria Shapes at a Glance · flowchart

Flowchart9 objects

Biology

Biology · L3 · Ecological Pyramids: Energy, Biomass, and Numbers · flowchart

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Biology · L3 · Ecological Pyramids: Energy, Biomass, and Numbers · flowchart

Flowchart9 objects

Biology

Biology · L4 · Bacterial Conjugation

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Biology · L4 · Bacterial Conjugation

Flashcards10 cards

What is a population's 'standing crop'?1 / 10

The total biomass of a population present in an ecosystem at one specific moment, as if every individual could be weighed all at once. It is a snapshot, not a measure of how much biomass that population produces over time.

Biology

Biology · L3 · Why Pyramids Invert: The Phytoplankton Example

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Biology · L3 · Why Pyramids Invert: The Phytoplankton Example

Note~273 words · 1 min

Your Amazing Body Your body is like a busy team. Every part has a job to do, and all the parts work together to keep you moving, breathing, and growing. Bones and Muscles Work Together Your Heart and Lungs Keep You Going Your Skin Covers It

Biology

Your Amazing Body

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Your Amazing Body

Flashcards10 cards

Distinguish first-, second-, and third-class lever systems in the musculoskeletal system, with an example of each.1 / 10

In a first-class lever, the fulcrum sits between the effort and the load (e.g. the joint between the skull and the first cervical vertebra, with neck muscles as effort balancing head weight as load). In a second-class lever, the load sits between the fulcrum and the effort (e.g. standing on tiptoes, where the ball of the foot is the fulcrum, body weight is the load in the middle, and calf muscle force pulling up on the heel is the effort) — this arrangement always produces a mechanical advantage greater than 1, trading speed/range of motion for force. In a third-class lever, the effort sits between the fulcrum and the load (e.g. the elbow joint during forearm flexion, with the biceps inserting close to the elbow fulcrum and the load held at the hand, far from the fulcrum) — the arrangement most common in vertebrate limbs, which sacrifices mechanical advantage (requiring more muscle force than the load itself) in exchange for greater speed and range of motion at the far end of the limb.

Biology