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Biology: explore STEM content (page 44 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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Note~308 words · 2 min

How Nerve Cells Send Messages A neuron is a nerve cell — a tiny messenger built to receive a signal, carry it along, and hand it off to the next cell. Trillions of neurons connect together to form your whole nervous system, but every single

Biology

Biology · L2 · How Nerve Cells Send Messages

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Biology · L2 · How Nerve Cells Send Messages

Collection5 items

01Biology · L4 · Signal Transduction Pathways

02Biology · L4 · Cell Cycle Checkpoints and Apoptosis

03Biology · L4 · Cell Signaling and Cycle Regulation Quiz

+2 more

Biology

Biology · L4 · Cell Signaling and Cycle Regulation

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Biology · L4 · Cell Signaling and Cycle Regulation

Collection5 items

01Biology · L1 · Different Ways Parents Care for Babies

02Biology · L1 · Nursing, Feeding, and Teaching Baby Animals

03Biology · L1 · How Animal Parents Care for Their Young Quiz

+2 more

Biology

Biology · L1 · How Animal Parents Care for Their Young

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Biology · L1 · How Animal Parents Care for Their Young

Collection5 items

01Biology · L3 · Innate Behavior and Fixed Action Patterns

02Biology · L3 · Learned Behavior: Habituation, Imprinting, and Conditioning

03Biology · L3 · Animal Behavior: Instinct and Learning

+2 more

Biology

Biology · L3 · Animal Behavior and Instinct

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Biology · L3 · Animal Behavior and Instinct

Flashcards10 cards

What is pollen?1 / 10

Pollen is a fine, powdery dust made by flowers.

Biology

Biology · L1 · How Pollen Travels

@openstem

Biology · L1 · How Pollen Travels

Flowchart14 objects

Biology

Biology · L5 · Gene Network Motifs

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Biology · L5 · Gene Network Motifs

Flowchart7 objects

Biology

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

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

Quiz5 questions

A thymocyte in the medulla binds a self-peptide–MHC complex, presented via AIRE-dependent promiscuous gene expression, with high avidity. What is the most likely fate of this cell?

APositive selection into the mature CD4 or CD8 lineageBDeath by neglect from insufficient TCR signalCClonal deletion by negative selectionDDifferentiation into a memory T cell

Biology

Biology · L5 · Advanced Immunology: Tolerance & Cytokine Networks

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Biology · L5 · Advanced Immunology: Tolerance & Cytokine Networks

Flashcards9 cards

What is the cornea, and what does it do?1 / 9

The cornea is the clear, curved covering at the very front of the eye. It bends (refracts) light as it enters, starting the process of focusing an image.

Biology

Biology · L2 · The Eye: Structure and Vision

@openstem

Biology · L2 · The Eye: Structure and Vision

Flashcards10 cards

What are cilia, and how does smoking affect them?1 / 10

Cilia are tiny hair-like structures lining the airways that sweep mucus, dust, and pathogens up and out of the lungs. Chemicals in cigarette smoke paralyze and eventually destroy cilia, so debris and pathogens build up instead of being cleared.

Biology

Biology · L3 · Smoking, Chronic Lung Disease, and Pneumonia

@openstem

Biology · L3 · Smoking, Chronic Lung Disease, and Pneumonia

Quiz5 questions

Which of these is NOT one of the skeleton's main jobs?

ASupporting the bodyBProtecting organsCDigesting foodDWorking with muscles to move

Biology

Biology · L2 · Bones and Muscles

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Biology · L2 · Bones and Muscles

Quiz5 questions

Which insect is known for flying a very long distance to escape winter?

AThe ladybugBThe monarch butterflyCThe earthwormDThe garden ant

Biology

Biology · L1 · Insects in Winter Quiz

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Biology · L1 · Insects in Winter Quiz

Flowchart9 objects

Biology

Biology · L3 · Turgor Pressure and Plasmolysis · flowchart

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Biology · L3 · Turgor Pressure and Plasmolysis · flowchart

Flashcards10 cards

Why do prey animals use camouflage?1 / 10

Prey animals use camouflage to hide from predators that want to eat them.

Biology

Biology · L1 · Why Camouflage Helps

@openstem

Biology · L1 · Why Camouflage Helps

Flashcards10 cards

What is a reptile?1 / 10

A reptile has dry, scaly skin. Snakes, lizards, and turtles are reptiles.

Biology

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

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

Note~227 words · 1 min

How Desert Animals Conserve Water Deserts offer very little water, so animals that live there have evolved very different ways of coping. Some, like camels, store energy as fat and can handle huge, fast drinks when water is available. Other

Biology

Biology · L2 · How Desert Animals Conserve Water at a Glance

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Biology · L2 · How Desert Animals Conserve Water at a Glance

Quiz5 questions

What is the primary goal of the decellularization process when generating a tissue engineering scaffold from donor tissue?

ATo increase the immunogenicity of the donor tissue for stronger immune activation.BTo remove donor cellular and nuclear material (and its immunogenic antigens) while preserving the native three-dimensional extracellular matrix architecture and its embedded structural and biochemical cues.CTo completely dissolve the extracellular matrix, leaving only isolated donor cells for later use.DTo convert the donor tissue into a synthetic polymer scaffold.

Biology

Biology · L5 · Regenerative Medicine and Tissue Engineering

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Biology · L5 · Regenerative Medicine and Tissue Engineering

Flowchart19 objects

Biology

Biology · L3 · The Nitrogen Cycle

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Biology · L3 · The Nitrogen Cycle

Note~459 words · 2 min

The Circulatory System The circulatory system moves blood through the body, delivering oxygen and nutrients to tissues and carrying away waste products such as carbon dioxide. It is powered by the heart, a muscular pump divided into four ch

Biology

Biology · L3 · The Circulatory System

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Biology · L3 · The Circulatory System

Flowchart7 objects

Biology

Biology · L2 · Why and How Cells Divide · flowchart

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Biology · L2 · Why and How Cells Divide · flowchart

Note~340 words · 2 min

Classifying life Taxonomy is the science of naming and organizing organisms into a nested hierarchy of groups, called taxa, based on shared characteristics and evolutionary relationships. Each rank in the hierarchy is broader than the one b

Biology

Biology · L3 · The Taxonomic Hierarchy

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Biology · L3 · The Taxonomic Hierarchy

Note~1214 words · 6 min

Potency: A Hierarchy of Developmental Capacity Developmental potential, or potency, is not binary but exists along a graded hierarchy, progressively restricted as cells commit to specific lineages during development. Each restriction step c

Biology

Biology · L5 · Stem Cells and Regenerative Biology: Potency, Niches, and Reprogramming

@openstem

Biology · L5 · Stem Cells and Regenerative Biology: Potency, Niches, and Reprogramming

Note~409 words · 2 min

Mechanisms of Neurodegeneration Despite their distinct clinical presentations, the major neurodegenerative diseases converge on a shared underlying logic: a specific protein misfolds, aggregates, overwhelms cellular protein quality control,

Biology

Biology · L5 · Mechanisms of Neurodegeneration

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Biology · L5 · Mechanisms of Neurodegeneration

Flowchart5 objects

Biology

Biology · L2 · Traits and Heredity at a Glance · flowchart

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Biology · L2 · Traits and Heredity at a Glance · flowchart

Note~338 words · 2 min

From Egg to Chick: How a Bird Develops A chicken starts life as a single egg. Inside that egg, a lot of growing happens before a chick is ready to hatch. What's Inside an Egg An egg looks simple on the outside, but it has everything a growi

Biology