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Biology: explore STEM content (page 17 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.

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Collection5 items

01Biology · L3 · The Big Five Mass Extinctions

02Biology · L3 · Adaptive Radiation After Mass Extinction

03Biology · L3 · Mass Extinction and Adaptive Radiation Quiz

+2 more

Biology

Biology · L3 · Mass Extinction and Adaptive Radiation

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Biology · L3 · Mass Extinction and Adaptive Radiation

Flowchart8 objects

Biology

Biogeography · flowchart

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Biogeography · flowchart

Note~364 words · 2 min

Advanced Virus-Host Interactions The outcome of a viral infection is determined by a rapid molecular contest between host innate immune sensing and antiviral effector mechanisms on one side, and virus-encoded antagonists of those same mecha

Biology

Biology · L5 · Advanced Virus-Host Interactions

@openstem

Biology · L5 · Advanced Virus-Host Interactions

Quiz5 questions

A Hox gene positioned at the 3' end of its cluster is, relative to a gene at the 5' end of the same cluster, characteristically:

AExpressed later in development and in a more posterior domainBExpressed earlier in development and in a more anterior domainCExpressed at the same time and in an overlapping domain, since cluster position carries no regulatory informationDTranscribed only in extraembryonic tissue regardless of cluster position

Biology

Biology · L5 · Evolutionary Developmental Biology Quiz

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Biology · L5 · Evolutionary Developmental Biology Quiz

Flashcards9 cards

What is denitrification, and what does it convert?1 / 9

Denitrification is the conversion of nitrate (NO3−) back into nitrogen gas (N2), which is released into the atmosphere. It is carried out by denitrifying bacteria and completes the nitrogen cycle by returning fixed nitrogen to the same unreactive atmospheric form it started in.

Biology

Biology · L3 · Nitrogen Cycle: Denitrification and the Full Loop

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Biology · L3 · Nitrogen Cycle: Denitrification and the Full Loop

Note~561 words · 3 min

Classical Genetics and Inheritance Patterns Mendel's laws of segregation and independent assortment describe the simplest possible inheritance case: one gene, two alleles, complete dominance, and genes on different chromosomes. Real inherit

Biology

Classical Genetics and Inheritance Patterns

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Classical Genetics and Inheritance Patterns

Note~343 words · 2 min

How Sense Organs Detect the World Sense organs are the body's link to the outside world. Each one is built to detect a specific kind of stimulus — light, sound, touch, chemicals — and turn it into a nerve signal the brain can interpret. The

Biology

Biology · L2 · How Sense Organs Detect the World

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Biology · L2 · How Sense Organs Detect the World

Flowchart7 objects

Biology

Biology · L3 · Gene Editing with CRISPR: The Basics · flowchart

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Biology · L3 · Gene Editing with CRISPR: The Basics · flowchart

Flashcards10 cards

What is DNA?1 / 10

DNA (short for deoxyribonucleic acid) is a long molecule found inside the cells of living things. It carries the instructions — called genes — for building and running an organism.

Biology

Biology · L2 · What Is DNA? The Basics

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Biology · L2 · What Is DNA? The Basics

Collection5 items

01Biology · L1 · Tooth Shapes and Jobs

02Biology · L1 · Guess the Diet by the Teeth

03Biology · L1 · Animal Teeth Quiz

+2 more

Biology

Biology · L1 · Animal Teeth and What They Eat

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Biology · L1 · Animal Teeth and What They Eat

Collection5 items

01Biology · L3 · Asthma: Causes and Triggers

02Biology · L3 · Smoking, Chronic Lung Disease, and Pneumonia

03Biology · L3 · Respiratory Disorders Quiz

+2 more

Biology

Biology · L3 · Respiratory Disorders

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Biology · L3 · Respiratory Disorders

Note~596 words · 3 min

Comparative Vertebrate Anatomy Comparative anatomy asks how the same underlying structures have been modified across vertebrate lineages to serve different functions, and how convergent pressures have produced similar solutions from entirel

Biology

Comparative Vertebrate Anatomy

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Comparative Vertebrate Anatomy

Note~420 words · 2 min

Human Nutrition: Macronutrients, Energy, and Diet Every day, the body needs a steady supply of energy and building materials to keep cells working, grow new tissue, and repair damage. Three nutrients — carbohydrates, proteins, and fats — ar

Biology

Biology · L3 · Human Nutrition: Fueling the Body

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Biology · L3 · Human Nutrition: Fueling the Body

Flowchart5 objects

Biology

Plants and Animals · flowchart

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Plants and Animals · flowchart

Note~300 words · 2 min

Discovering Cells: Microscopes and Cell Theory Before the 1600s, nobody knew that living things were made of cells — cells are simply too small to see with the naked eye. Everything changed once lens makers learned to grind curved pieces of

Biology

Biology · L2 · Discovering Cells: Microscopes and Cell Theory

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Biology · L2 · Discovering Cells: Microscopes and Cell Theory

Note~741 words · 4 min

Thermoregulation and Osmoregulation Body temperature and internal fluid composition are both maintained against constant environmental pressure to change them. Thermoregulation and osmoregulation share a common logic: sensors detect deviati

Biology

Thermoregulation and Osmoregulation

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Thermoregulation and Osmoregulation

Note~500 words · 3 min

Advanced CRISPR Genome Editing Beyond the standard Cas9 double-strand-break-and-repair paradigm, a second generation of CRISPR tools performs precise editing without cutting both DNA strands, expands the range of targetable sequences and de

Biology

Biology · L5 · Advanced CRISPR Genome Editing

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Biology · L5 · Advanced CRISPR Genome Editing

Quiz5 questions

Why do plants need light?

ATo stay coolBTo make their own foodCTo make noiseDTo grow roots underground

Biology

Biology · L1 · Plants Grow Toward the Light Quiz

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Biology · L1 · Plants Grow Toward the Light Quiz

Quiz5 questions

A 3 gigabase (Gb) haploid genome is sequenced, producing 90 Gb of mappable, aligned bases from short reads. What is the approximate average sequencing depth (coverage)?

A3xB10xC30xD90x

Biology

Biology · L5 · Genomics and Bioinformatics

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Biology · L5 · Genomics and Bioinformatics

Note~430 words · 2 min

How Water Moves Through a Plant A plant's stem already carries water upward through its xylem tubes. But what actually powers that upward movement? The answer is transpiration — water evaporating out of the leaves, which pulls a continuous

Biology

Biology · L2 · How Water Moves Through a Plant

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Biology · L2 · How Water Moves Through a Plant

Flashcards10 cards

Are whales and dolphins fish?1 / 10

No. Whales and dolphins are mammals, just like dogs, cats, and people.

Biology

Biology · L1 · Whales and Dolphins Have Lungs

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Biology · L1 · Whales and Dolphins Have Lungs

Flashcards10 cards

What is an antigen?1 / 10

An antigen is a marker — usually a protein — found on the surface of a germ or other invader. It's what your immune system uses to recognize that something doesn't belong in your body.

Biology

Biology · L2 · Antibodies: The Lock-and-Key Idea

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Biology · L2 · Antibodies: The Lock-and-Key Idea

Flowchart13 objects

Biology

Two Nutrient Absorption Routes from the Small Intestine

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Two Nutrient Absorption Routes from the Small Intestine

Collection5 items

01Biology · L3 · Ectotherms, Endotherms, and Heterotherms

02Biology · L3 · Energy Trade-offs of Thermoregulation

03Biology · L3 · Animal Thermoregulation Strategies Quiz

+2 more

Biology

Biology · L3 · Animal Thermoregulation Strategies

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Biology · L3 · Animal Thermoregulation Strategies

Flashcards10 cards

What is hydrotropism?1 / 10

Hydrotropism is the directional growth of a plant part, usually a root, toward a source of moisture in the soil. It helps roots find water even when that water is not directly below the seed.

Biology

Biology · L3 · Hydrotropism: Roots Growing Toward Water

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Biology · L3 · Hydrotropism: Roots Growing Toward Water

Collection5 items

01Biology · L1 · Legs for Walking, Running & Jumping

02Biology · L1 · Wings, Fins & No Legs at All

03Biology · L1 · How Animals Move Quiz

+2 more

Biology

Biology · L1 · How Animals Move

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Biology · L1 · How Animals Move

Flowchart15 objects

Biology

Biology · L5 · C9orf72 Repeat Expansion Toxicity Pathways

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Biology · L5 · C9orf72 Repeat Expansion Toxicity Pathways

Quiz5 questions

Which word equation correctly describes cellular respiration?

ACarbon dioxide + water + sunlight → glucose + oxygenBGlucose + oxygen → carbon dioxide + water + energyCGlucose + carbon dioxide → oxygen + waterDWater + oxygen → glucose + energy

Biology