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Biology: explore STEM content (page 24 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~602 words · 3 min

Transpiration at Ecosystem Scale: Forests and the Water Cycle A single tree loses a surprising amount of water every day, releasing it as vapor from its leaves in a process called transpiration. On its own, one tree's water loss barely regi

Biology

Biology · L3 · Transpiration at Ecosystem Scale: Forests and the Water Cycle

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Biology · L3 · Transpiration at Ecosystem Scale: Forests and the Water Cycle

Collection5 items

01Biology · L3 · Innate Immunity

02Biology · L3 · Adaptive Immunity

03Biology · L3 · The Immune System Quiz

+2 more

Biology

Biology · L3 · The Immune System

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Biology · L3 · The Immune System

Note~465 words · 2 min

Advanced Mitochondrial Bioenergetics Oxidative phosphorylation converts the redox energy of nutrient oxidation into ATP through a chain of membrane-embedded protein complexes that pump protons across the inner mitochondrial membrane, storin

Biology

Biology · L5 · Advanced Mitochondrial Bioenergetics

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Biology · L5 · Advanced Mitochondrial Bioenergetics

Flowchart5 objects

Biology

Biology · L3 · Joints and Skeletal Functions · flowchart

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Biology · L3 · Joints and Skeletal Functions · flowchart

Collection5 items

01Biology · L2 · The Skin: An Organ That Protects and Cools

02Biology · L2 · Kidneys and the Urinary System

03Biology · L2 · Skin and Kidneys Quiz

+2 more

Biology

Biology · L2 · Skin and Kidneys

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Biology · L2 · Skin and Kidneys

Flowchart7 objects

Biology

Annual and Perennial Plants: How Long Do Plants Live? · flowchart

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Annual and Perennial Plants: How Long Do Plants Live? · flowchart

Flowchart7 objects

Biology

Biology · L3 · An Introduction to Biotechnology: Cloning and GMOs · flowchart

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Biology · L3 · An Introduction to Biotechnology: Cloning and GMOs · flowchart

Note~296 words · 1 min

Plant Biology Plants convert light energy into chemical energy, distribute water and sugars through specialized transport tissues, and coordinate growth and reproduction using chemical signals. The structures and processes below work togeth

Biology

Biology · L3 · Plant Biology

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Biology · L3 · Plant Biology

Flashcards10 cards

How does your nose let you smell things, like fresh bread?1 / 10

Tiny bits of the bread's smell float in the air. When you breathe in, they touch special spots high inside your nose, and a nerve sends the smell to your brain.

Biology

Biology · L1 · Your Nose, Tongue, and Skin

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Biology · L1 · Your Nose, Tongue, and Skin

Flashcards10 cards

What is minimum viable population (MVP) size, and what does it attempt to quantify?1 / 10

Minimum viable population size is the smallest population size estimated to have a specified probability (e.g. 95%) of persisting for a specified time (e.g. 100 years) despite the combined effects of demographic stochasticity, environmental variation, genetic deterioration, and catastrophes. It is a probabilistic threshold, not a hard cutoff, generated using population viability analysis (PVA), and is used to set conservation targets such as the minimum area or number of individuals a reserve or captive-breeding program needs to support.

Biology

Biology · L4 · Extinction Risk and Population Viability

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Biology · L4 · Extinction Risk and Population Viability

Note~472 words · 2 min

Cellular respiration: glycolysis, Krebs cycle, and oxidative phosphorylation Cellular respiration is the process by which cells extract energy from organic molecules, principally glucose (C₆H₁₂O₆), and store it as ATP. The overall reaction:

Biology

Biology · L4 · Cellular respiration: glycolysis, Krebs cycle, and oxidative phosphorylation

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Biology · L4 · Cellular respiration: glycolysis, Krebs cycle, and oxidative phosphorylation

Quiz3 questions

In the lac operon, which molecule acts as the true inducer that releases the LacI repressor from the operator?

ALactoseBAllolactoseCGlucoseDcAMP

Biology

Biology · L5 · Gene Regulation & Epigenetics

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Biology · L5 · Gene Regulation & Epigenetics

Note~290 words · 1 min

Animals That Live in Groups Many animals do not live alone. They live together in groups. Each kind of group has its own special name! Special Names for Animal Groups Here are some group names you might hear at the zoo, on a farm, or in a n

Biology

Animals That Live in Groups

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Animals That Live in Groups

Flashcards9 cards

What does the brain do?1 / 9

The brain is the body's control centre. It receives messages from the senses, makes decisions, and sends out instructions to the rest of the body.

Biology

Biology · L2 · The Brain

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Biology · L2 · The Brain

Flowchart10 objects

Biology

Biology · L3 · The Carbon Cycle

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Biology · L3 · The Carbon Cycle

Flowchart7 objects

Biology

Biology · L1 · How New Plants Grow Without Seeds · flowchart

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Biology · L1 · How New Plants Grow Without Seeds · flowchart

Note~371 words · 2 min

Glycobiology Glycans — carbohydrate chains attached to proteins and lipids — constitute an information-dense molecular layer distinct from, and largely unpredictable from, the underlying protein or lipid sequence alone, governing protein fo

Biology

Biology · L5 · Glycobiology

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Biology · L5 · Glycobiology

Collection4 items

01Biology · L4 · Digestive Enzymes, Motility, and Regulation

02Biology · L4 · Digestive Physiology Quiz

03Digestive Physiology

+1 more

Biology

Biology · L4 · Digestive Physiology

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Biology · L4 · Digestive Physiology

Flashcards10 cards

What is a virus, and why is it usually described as non-living?1 / 10

A virus is an infectious particle made of genetic material (DNA or RNA) enclosed in a protein coat. It is usually considered non-living because it has no cytoplasm, ribosomes, or metabolism of its own, and cannot reproduce without hijacking the machinery of a living host cell.

Biology

Biology · L3 · Viruses and Infection

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Biology · L3 · Viruses and Infection

Note~547 words · 3 min

Plant Water Relations: Turgor Pressure and Wilting Plant cells move water by osmosis just like any other cell, but one extra structure changes everything: the rigid cell wall. Because a plant cell is wrapped in a wall that its membrane cann

Biology

Biology · L3 · Plant Water Relations: Turgor Pressure and Wilting

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Biology · L3 · Plant Water Relations: Turgor Pressure and Wilting

Note~215 words · 1 min

The Reproductive System The reproductive system is responsible for producing gametes (sex cells), and, following fertilization, supporting the development of offspring. The female reproductive system produces ova and provides an environment

Biology

Biology · L3 · The Reproductive System

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Biology · L3 · The Reproductive System

Flowchart9 objects

Biology

Biology · L2 · How Water Moves Through a Plant · flowchart

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Biology · L2 · How Water Moves Through a Plant · flowchart

Flashcards10 cards

What do poison ivy leaves look like?1 / 10

Poison ivy grows in groups of three shiny, pointed leaves. There's an old saying that helps people remember: "Leaves of three, let it be."

Biology

Biology · L2 · Spotting Plant Defenses in the Wild

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Biology · L2 · Spotting Plant Defenses in the Wild

Flowchart9 objects

Biology

Biology · L3 · The CRISPR-Cas9 Editing Process

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Biology · L3 · The CRISPR-Cas9 Editing Process

Note~573 words · 3 min

Ecological Pyramids: Energy, Biomass, and Numbers You already know that only a fraction of the energy at one trophic level passes on to the next. Ecologists use that idea to build three different kinds of pyramid diagrams, each stacking an

Biology

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

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

Flowchart5 objects

Biology

Biology · L2 · Simple Plant Defenses Quiz · flowchart

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Biology · L2 · Simple Plant Defenses Quiz · flowchart

Flashcards10 cards

Distinguish osmoconformers from osmoregulators.1 / 10

Osmoconformers (mostly marine invertebrates) keep their internal osmolarity matched to that of the surrounding seawater, so they face no net osmotic gradient and expend little energy on osmotic work, but they cannot tolerate large salinity changes. Osmoregulators (most vertebrates) actively maintain an internal osmolarity different from their environment using energy-dependent transport, which costs more but allows them to occupy habitats with fluctuating or extreme salinity, such as freshwater or estuaries.

Biology

Biology · L4 · Osmoregulation and Excretion

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Biology · L4 · Osmoregulation and Excretion

Flashcards10 cards

What is a biome?1 / 10

A biome is a large region of the world defined by its climate, and home to the particular plants and animals adapted to survive there.

Biology

Biology · L2 · Major Biomes of the World

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Biology · L2 · Major Biomes of the World

Quiz5 questions

An enhancer can activate a gene even when located far away and on either side of the promoter primarily because:

AIt diffuses through the nucleoplasm to reach the promoterBDNA looping brings the enhancer-bound activators into physical contact with the promoter-bound machinery, often via MediatorCEnhancers directly encode a protein that travels to the promoterDEnhancers must always be located immediately upstream of the TATA box

Biology

Biology · L4 · Eukaryotic Transcriptional Regulation Quiz

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Biology · L4 · Eukaryotic Transcriptional Regulation Quiz

Quiz5 questions

Which structure produces both ova and the hormones estrogen and progesterone?

AThe fallopian tubeBThe uterusCThe ovaryDThe cervix

Biology

Biology · L3 · The Reproductive System

@openstem

Biology · L3 · The Reproductive System

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