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Biology: explore STEM content (page 11 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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Flowchart7 objects

Biology

Biology · L2 · How Desert Plants Store Water at a Glance · flowchart

@openstem

Biology · L2 · How Desert Plants Store Water at a Glance · flowchart

Collection5 items

01Biology · L4 · Hardy-Weinberg Model

02Biology · L4 · Forces That Change Allele Frequencies

03Biology · L4 · Population Genetics Quiz

+2 more

Biology

Biology · L4 · Population Genetics

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Biology · L4 · Population Genetics

Flowchart13 objects

Biology

Biology · L5 · Proteomics and Mass Spectrometry · flowchart

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Biology · L5 · Proteomics and Mass Spectrometry · flowchart

Collection5 items

01Biology · L1 · Insects: Legs and Parts

02Biology · L1 · Spiders, Worms, and Snails

03Biology · L1 · Bugs and Minibeasts Quiz

+2 more

Biology

Biology · L1 · Bugs and Minibeasts

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Biology · L1 · Bugs and Minibeasts

Note~220 words · 1 min

The Circulatory System: Your Body's Delivery Service Every cell in your body needs oxygen and nutrients to survive. The circulatory system delivers them by pumping blood through a network of tubes called blood vessels. At the center of the

Biology

Biology · L2 · The Circulatory System

@openstem

Biology · L2 · The Circulatory System

Flowchart11 objects

Biology

Distinguishing Monophyletic, Paraphyletic, and Polyphyletic Groups

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Distinguishing Monophyletic, Paraphyletic, and Polyphyletic Groups

Flowchart14 objects

Biology

Biology · L5 · Nutrient-Sensing Longevity Network

@openstem

Biology · L5 · Nutrient-Sensing Longevity Network

Flashcards10 cards

What is a germ?1 / 10

A germ is a general name for a tiny living thing that can cause disease. Bacteria and viruses are the two most common kinds of germs.

Biology

Biology · L2 · Germs: Bacteria and Viruses

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Biology · L2 · Germs: Bacteria and Viruses

Flowchart17 objects

Biology

Biology · L2 · Sorting Plant Defenses

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Biology · L2 · Sorting Plant Defenses

Flashcards10 cards

What does xylem transport, and in which direction does it move?1 / 10

Xylem transports water and dissolved mineral ions from the roots upward to the stems and leaves. Movement is one-directional, driven mainly by transpiration pulling water up through dead, hollow xylem cells.

Biology

Biology · L3 · Plant Transport and Hormones

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Biology · L3 · Plant Transport and Hormones

Note~956 words · 5 min

Molecular Basis of Neoplastic Transformation Cancer arises through the clonal accumulation of somatic mutations that deregulate the genes controlling cell proliferation, survival, and genomic integrity. Two broad gene classes are implicated

Biology

Biology · L5 · Cancer Biology: From Mutation to Malignancy

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Biology · L5 · Cancer Biology: From Mutation to Malignancy

Flowchart7 objects

Biology

Biology · L3 · Fungi: Decomposers, Partners, and Pathogens · flowchart

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Biology · L3 · Fungi: Decomposers, Partners, and Pathogens · flowchart

Quiz5 questions

What do bees and butterflies get from flowers?

ANectar to eatBWater to swim inCA place to sleep all winterDNothing at all

Biology

Biology · L1 · Bees, Butterflies, and Flowers Quiz

@openstem

Biology · L1 · Bees, Butterflies, and Flowers Quiz

Collection5 items

01Biology · L3 · The Three Types of Muscle Tissue

02Biology · L3 · How Skeletal Muscle Contracts

03Biology · L3 · Skeletal Muscle Contraction

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Biology

Biology · L3 · The Muscular System

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Biology · L3 · The Muscular System

Flowchart9 objects

Biology

Biology · L5 · Regenerative Medicine and Tissue Engineering · flowchart

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Biology · L5 · Regenerative Medicine and Tissue Engineering · flowchart

Quiz5 questions

Which organelle is responsible for modifying, sorting, and packaging proteins received from the endoplasmic reticulum?

AGolgi apparatusBLysosomeCMitochondrionDNucleolus

Biology

Biology · L3 · Cell Biology Quiz

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Biology · L3 · Cell Biology Quiz

Flowchart15 objects

Biology

Biology · L3 · Touch and Water Responses in Plants

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Biology · L3 · Touch and Water Responses in Plants

Collection5 items

01Biology · L4 · Evolution & Natural Selection

02Biology · L4 · Ecology — Populations, Communities & Ecosystems

03Biology · L4 · Ecology, evolution, and the web of life

+2 more

Biology

Biology · L4 · Ecology & Evolution Essentials

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Biology · L4 · Ecology & Evolution Essentials

Collection5 items

01Biology · L4 · Michaelis-Menten Enzyme Kinetics

02Biology · L4 · Cellular Respiration Overview

03Biology · L4 · Enzyme Kinetics and Metabolism Quiz

+2 more

Biology

Biology · L4 · Enzyme Kinetics and Metabolic Pathways

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Biology · L4 · Enzyme Kinetics and Metabolic Pathways

Flashcards9 cards

Explain the chemistry of a cytosine base editor (CBE) and why it does not require a double-strand break to install a point mutation.1 / 9

A cytosine base editor fuses a catalytically impaired Cas9 nickase (Cas9 D10A, which nicks only the non-target strand) to a cytidine deaminase domain (derived from APOBEC or AID family enzymes) and a uracil glycosylase inhibitor (UGI). The deaminase converts cytosine to uracil within the single-stranded DNA exposed in the R-loop formed when the guide RNA binds its target, at a position set by the editing window (typically protospacer positions 4-8 counting from the PAM-distal end).

Biology

Biology · L5 · Advanced CRISPR Genome Editing

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Biology · L5 · Advanced CRISPR Genome Editing

Flashcards10 cards

What is your skeleton made of?1 / 10

Many bones! Your skeleton is lots of bones joined together inside your body.

Biology

Biology · L1 · Bones and Muscles Help You Move

@openstem

Biology · L1 · Bones and Muscles Help You Move

Quiz5 questions

Countercurrent heat exchange in a limb primarily functions to:

AIncrease heat loss from the extremity to speed coolingBTransfer heat from warm arterial blood to cool venous blood, retaining it in the coreCEqualize blood pressure between arteries and veinsDGenerate heat directly through friction between opposing blood flows

Biology

Biology · L4 · Thermoregulation and Osmoregulation Quiz

@openstem

Biology · L4 · Thermoregulation and Osmoregulation Quiz

Flashcards9 cards

How many daughter cells does one round of meiosis produce, compared to one round of mitosis?1 / 9

Meiosis produces four daughter cells from a single starting cell. Mitosis produces two daughter cells.

Biology

Biology · L3 · Meiosis vs. Mitosis and Genetic Variation

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Biology · L3 · Meiosis vs. Mitosis and Genetic Variation

Flashcards10 cards

Describe the two-step mechanism by which NMDA receptor activation requires both glutamate binding and postsynaptic depolarization — the basis of coincidence detection.1 / 10

NMDA receptors are simultaneously ligand-gated and voltage-gated. At resting membrane potential, an extracellular Mg2+ ion occludes the channel pore, so glutamate binding alone is insufficient to permit ion flow. Only when the postsynaptic membrane is substantially depolarized — typically by concurrent, strong AMPA receptor activation from repetitive presynaptic firing — is the Mg2+ ion electrostatically expelled from the pore, permitting Ca2+ and Na+ influx.

Biology

Biology · L5 · Synaptic Plasticity

@openstem

Biology · L5 · Synaptic Plasticity

Flashcards10 cards

What is a hypha?1 / 10

A hypha (plural: hyphae) is a single thread-like filament that makes up the body of a multicellular fungus. Each hypha is a tube of cytoplasm surrounded by a rigid cell wall made of chitin, and it grows by extending at its tip.

Biology

Biology · L3 · Fungal Structure and Life Cycle

@openstem

Biology · L3 · Fungal Structure and Life Cycle

Note~256 words · 1 min

Fur, Feathers, Scales, and Skin Every animal has a covering on the outside of its body. This covering is not just for looks. It has an important job to do, like keeping the animal warm, dry, safe, or hidden. Why Coverings Matter Animals liv

Biology

Biology · L1 · Animal Coverings: Fur, Feathers, Scales, and Skin

@openstem

Biology · L1 · Animal Coverings: Fur, Feathers, Scales, and Skin

Flowchart7 objects

Biology

Biology · L1 · Four Ways Animals Move

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Biology · L1 · Four Ways Animals Move

Flowchart9 objects

Biology

Biology · L3 · Why the Phytoplankton Biomass Pyramid Inverts

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Biology · L3 · Why the Phytoplankton Biomass Pyramid Inverts

Flowchart9 objects

Biology

The Human Microbiome · flowchart

@openstem

The Human Microbiome · flowchart

Note~378 words · 2 min

Biophysics and Single-Molecule Methods Single-molecule biophysical methods observe individual biomolecules one at a time rather than averaging over a bulk population, revealing mechanistic detail — discrete conformational states, stepwise m

Biology

Biology · L5 · Biophysics and Single-Molecule Methods

@openstem

Biology · L5 · Biophysics and Single-Molecule Methods

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