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

Biology

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Biology: explore STEM content (page 42 of 50) · openstem

Quiz5 questions

What is asexual (vegetative) plant propagation?

AGrowing a new plant from a seed after pollinationBGrowing a new plant from a piece of a parent plant, without fertilizationCA flower attracting insects to spread its pollenDA seed being carried away by wind or animals

Biology

Biology · L2 · Plant Propagation Without Seeds Quiz

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Biology · L2 · Plant Propagation Without Seeds Quiz

Quiz5 questions

What does it mean if an animal is "warm-blooded"?

AIts body temperature changes with the weatherBIt makes its own body heat and stays about the same temperatureCIt only lives in warm placesDIt has red blood

Biology

Biology · L1 · Warm-Blooded and Cold-Blooded Animals Quiz

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Biology · L1 · Warm-Blooded and Cold-Blooded Animals Quiz

Quiz3 questions

What is the control centre of a cell?

ACell membraneBNucleusCChloroplastDCytoplasm

Biology

Biology · L2 · Cell Basics

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Biology · L2 · Cell Basics

Collection5 items

01Biology · L2 · The Six Nutrient Groups

02Biology · L2 · Building a Balanced Meal

03Biology · L2 · Food Groups and Nutrition Quiz

+2 more

Biology

Biology · L2 · Food Groups and Nutrition

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Biology · L2 · Food Groups and Nutrition

Flowchart11 objects

Biology

Digestive Physiology · flowchart

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Digestive Physiology · flowchart

Flashcards10 cards

What happens to air as it passes through the nasal cavity?1 / 10

The nasal cavity warms the air to body temperature, moistens it with mucus so it doesn't dry out delicate lung tissue, and filters out dust and pathogens using mucus and tiny hairs called cilia.

Biology

Biology · L3 · Respiratory Anatomy

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Biology · L3 · Respiratory Anatomy

Flashcards5 cards

What is a cell?1 / 5

A cell is the smallest unit of life. Every living thing is made of one or more cells, just like a wall is built from bricks.

Biology

Biology · L2 · Cells: Life's Building Blocks

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Biology · L2 · Cells: Life's Building Blocks

Flowchart11 objects

Biology

Biology · L3 · Genetic Disorders: When Genes Go Wrong · flowchart

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Biology · L3 · Genetic Disorders: When Genes Go Wrong · flowchart

Flashcards10 cards

What is heterochrony, and why is it treated as a distinct category of evolutionary mechanism from changes in gene content?1 / 10

Heterochrony is evolutionary change in the relative timing or rate of developmental events between an ancestor and its descendant — the same developmental program runs, but earlier, later, faster, slower, or for a longer or shorter duration. It is mechanistically distinct because it requires no new genes and no new gene products, only altered regulation of when and how long existing developmental processes operate; a shift in a single regulatory threshold (e.g., the timing of growth-plate closure or of onset of sexual maturity) can cascade into substantial morphological divergence, making heterochrony a comparatively 'cheap' route to evolutionary novelty.

Biology

Biology · L5 · Mechanisms of Morphological Evolution

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Biology · L5 · Mechanisms of Morphological Evolution

Quiz5 questions

Which of the following lists the taxonomic ranks in the correct order, from broadest to most specific?

ASpecies, Genus, Family, Order, Class, Phylum, Kingdom, DomainBDomain, Kingdom, Phylum, Class, Order, Family, Genus, SpeciesCKingdom, Domain, Class, Phylum, Family, Order, Species, GenusDDomain, Phylum, Kingdom, Order, Class, Genus, Family, Species

Biology

Biology · L3 · Taxonomy and Classification Quiz

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Biology · L3 · Taxonomy and Classification Quiz

Quiz5 questions

Which part of a neuron receives signals from other neurons?

AAxonBDendriteCMyelin sheathDSynapse

Biology

Biology · L3 · The Nervous System

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Biology · L3 · The Nervous System

Collection5 items

01Biology · L3 · DNA Structure

02Biology · L3 · DNA Replication

03Biology · L3 · DNA Structure and Replication Quiz

+2 more

Biology

Biology · L3 · DNA Structure and Replication

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Biology · L3 · DNA Structure and Replication

Flowchart7 objects

Biology

Biology · L1 · A Frog's Life Cycle

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Biology · L1 · A Frog's Life Cycle

Collection5 items

01Biology · L2 · Camels: Fat Storage and Fast Rehydration

02Biology · L2 · Kangaroo Rats and Nighttime Survival

03Biology · L2 · How Desert Animals Conserve Water Quiz

+2 more

Biology

Biology · L2 · Desert Animal Water Conservation

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Biology · L2 · Desert Animal Water Conservation

Flowchart13 objects

Biology

Biology · L3 · Extremophiles: Life at the Edges · flowchart

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Biology · L3 · Extremophiles: Life at the Edges · flowchart

Flowchart10 objects

Biology

Biology · L1 · Diurnal vs Nocturnal Animals

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Biology · L1 · Diurnal vs Nocturnal Animals

Flashcards10 cards

What is a herbivore?1 / 10

A herbivore is an animal that only eats plants.

Biology

Biology · L1 · Who Eats What

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Biology · L1 · Who Eats What

Collection5 items

01Biology · L4 · Community Interactions and Succession

02Biology · L4 · Ecosystem Ecology and Conservation Biology

03Biology · L4 · Community and Ecosystem Ecology Quiz

+2 more

Biology

Biology · L4 · Community and Ecosystem Ecology

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Biology · L4 · Community and Ecosystem Ecology

Flowchart13 objects

Biology

Biology · L5 · RNA Biology, Splicing, and Noncoding RNA · flowchart

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Biology · L5 · RNA Biology, Splicing, and Noncoding RNA · flowchart

Quiz5 questions

Which of these best describes an animal's lifespan?

AThe time it takes to grow from birth to adulthoodBThe total time it is alive, from birth (or hatching) until deathCThe time it spends caring for its youngDHow quickly it can find food

Biology

Biology · L2 · Animal Lifespans Quiz

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Biology · L2 · Animal Lifespans Quiz

Flowchart13 objects

Biology

Biology · L2 · Three Ways Plants Grow Without Seeds · flowchart

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Biology · L2 · Three Ways Plants Grow Without Seeds · flowchart

Flowchart19 objects

Biology

Biology · L3 · Turgor Pressure vs. Plasmolysis

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Biology · L3 · Turgor Pressure vs. Plasmolysis

Flowchart7 objects

Biology

Biology · L2 · Incomplete Metamorphosis: A Grasshopper's Three Stages

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Biology · L2 · Incomplete Metamorphosis: A Grasshopper's Three Stages

Flowchart11 objects

Biology

Biology · L3 · How Antibiotic Resistance Evolves · flowchart

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Biology · L3 · How Antibiotic Resistance Evolves · flowchart

Flashcards9 cards

Why do we need sleep?1 / 9

Sleep helps your body and brain rest and grow.

Biology

Biology · L1 · Sleep, Exercise & Clean Hands

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Biology · L1 · Sleep, Exercise & Clean Hands

Flashcards10 cards

What is a microorganism?1 / 10

A microorganism is a living thing so small you need a microscope to see it. Bacteria, viruses, and many fungi are all microorganisms.

Biology

Biology · L2 · Bacteria: Helpful and Harmful

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Biology · L2 · Bacteria: Helpful and Harmful

Flashcards10 cards

What triggers synaptic vesicle fusion once an action potential reaches the axon terminal?1 / 10

Depolarization of the axon terminal opens voltage-gated Ca2+ channels, and Ca2+ flows in down its steep electrochemical gradient. The resulting local rise in intracellular Ca2+ is sensed by synaptotagmin on the vesicle membrane, which triggers the SNARE complex (synaptobrevin, syntaxin, SNAP-25) to complete membrane fusion between the vesicle and the presynaptic membrane.

Biology

Biology · L4 · Synaptic Transmission and Neurotransmitters

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Biology · L4 · Synaptic Transmission and Neurotransmitters

Quiz5 questions

Under strict neutral theory, why is the rate of molecular substitution expected to be independent of effective population size (Ne)?

ABecause natural selection acts equally strongly regardless of NeBBecause the higher number of new neutral mutations arising in a larger population (2Neμ) is exactly offset by each mutation's lower probability of fixation (1/2Ne)CBecause mutation rate μ itself scales inversely with NeDBecause genetic drift is negligible in populations of any size

Biology

Biology · L5 · Molecular Evolution and Phylogenetics Quiz

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Biology · L5 · Molecular Evolution and Phylogenetics Quiz

Flowchart9 objects

Biology

Biology · L3 · Animal Behavior: Instinct and Learning · flowchart

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Biology · L3 · Animal Behavior: Instinct and Learning · flowchart

Flowchart12 objects

Biology

Biology · L2 · The Journey of a Raindrop Through a Desert Plant

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Biology · L2 · The Journey of a Raindrop Through a Desert Plant

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