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Biology: explore STEM content (page 49 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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Biology

Biology · L4 · 2,3-Bisphosphoglycerate (2,3-BPG)

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Biology · L4 · 2,3-Bisphosphoglycerate (2,3-BPG)

Flowchart6 objects

Biology

Biology · L2 · How Desert Animals Conserve Water Quiz · flowchart

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Biology · L2 · How Desert Animals Conserve Water Quiz · flowchart

Quiz5 questions

Photoperiodism is best defined as a plant's response to:

ASoil temperatureBThe relative length of day and nightCWater availabilityDWind exposure

Biology

Biology · L3 · Photoperiodism Quiz

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Biology · L3 · Photoperiodism Quiz

Flowchart7 objects

Biology

Biology · L1 · Biennial Plants and Comparing Lifespans · flowchart

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Biology · L1 · Biennial Plants and Comparing Lifespans · flowchart

Flashcards10 cards

List the major categories of prezygotic isolating mechanisms.1 / 10

Prezygotic mechanisms prevent mating or fertilization from occurring at all: habitat isolation (populations occupy different habitats and rarely meet), temporal isolation (breeding at different times of day, season, or year), behavioral isolation (differing courtship displays or mating signals not recognized between groups), mechanical isolation (incompatible reproductive structures), and gametic isolation (sperm and egg are incompatible at a biochemical level even if mating is attempted, as in many broadcast-spawning marine invertebrates).

Biology

Biology · L4 · Reproductive Isolation and Species Boundaries

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Biology · L4 · Reproductive Isolation and Species Boundaries

Quiz5 questions

A target-decoy search reports 200 decoy PSMs and 20,000 target PSMs above a given score threshold. What is the estimated FDR at that threshold?

A0.1%B1%C10%D20%

Biology

Biology · L5 · Proteomics and Mass Spectrometry

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Biology · L5 · Proteomics and Mass Spectrometry

Note~490 words · 2 min

The Immune System The immune system is the network of cells, tissues, and organs that defends the body against pathogens — disease-causing organisms such as bacteria, viruses, fungi, and parasites. It works in two broad layers: innate immun

Biology

Biology · L3 · The Immune System

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Biology · L3 · The Immune System

Flowchart11 objects

Biology

Biology · L1 · Jobs in an Ant Colony

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Biology · L1 · Jobs in an Ant Colony

Note~172 words · 1 min

Human Life Stages at a Glance Every person passes through a series of general life stages as they grow. Each stage brings changes in size, skills, and independence. Growth speed also varies a great deal between species — humans take about 1

Biology

Biology · L2 · Human Life Stages at a Glance

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Biology · L2 · Human Life Stages at a Glance

Flashcards10 cards

What is a trait?1 / 10

A trait is a feature or characteristic of a living thing — like eye colour, height, or a skill such as swimming.

Biology

Biology · L2 · Inherited vs. Learned Traits

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Biology · L2 · Inherited vs. Learned Traits

Note~147 words · 1 min

The Three Bacteria Shapes at a Glance Bacteria are far too small to see with the naked eye, but under a microscope, scientists notice they come in a few basic shapes. Shape is one of the easiest clues for identifying what kind of bacterium

Biology

Biology · L2 · The Three Bacteria Shapes at a Glance

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Biology · L2 · The Three Bacteria Shapes at a Glance

Note~229 words · 1 min

How Seasons Change Plants and Animals Every year, the weather moves through four seasons: spring, summer, autumn, and winter. As the weather changes, plants and animals change too, so they can stay safe, find food, and stay warm. The Four S

Biology

How Seasons Change Plants and Animals

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How Seasons Change Plants and Animals

Note~522 words · 3 min

How Antibiotic Resistance Evolves It's tempting to picture antibiotics as somehow 'teaching' bacteria how to resist them. That's not what happens. Antibiotic resistance is a straightforward example of natural selection: variation already ex

Biology

Biology · L3 · How Antibiotic Resistance Evolves

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Biology · L3 · How Antibiotic Resistance Evolves

Flowchart7 objects

Biology

Biology · L1 · Day and Night Animals · flowchart

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Biology · L1 · Day and Night Animals · flowchart

Collection5 items

01Biology · L1 · How Insects Survive Winter

02Biology · L1 · Small Creatures, Big Winter Plans

03Biology · L1 · Insects in Winter Quiz

+2 more

Biology

Biology · L1 · How Insects Survive Winter

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Biology · L1 · How Insects Survive Winter

Flowchart9 objects

Biology

Biology · L2 · Growing Up: An Introduction to Human Reproduction · flowchart

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Biology · L2 · Growing Up: An Introduction to Human Reproduction · flowchart

Flashcards10 cards

State the neutral theory's core claim about the rate of molecular evolution, and identify the population-genetic result it rests on.1 / 10

Kimura's neutral theory holds that the overwhelming majority of nucleotide substitutions fixed over evolutionary time are selectively neutral or nearly neutral, not adaptive. It rests on the classical result that, for a strictly neutral allele, the rate of substitution per generation equals the neutral mutation rate μ, independent of population size — because a larger population produces proportionally more new neutral mutations (2Nμ per generation, diploid) but each has proportionally lower probability of fixation (1/(2N)), and the two effects exactly cancel.

Biology

Biology · L5 · The Molecular Clock

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Biology · L5 · The Molecular Clock

Flowchart11 objects

Biology

Cell Cycle Checkpoints

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Cell Cycle Checkpoints

Flowchart19 objects

Biology

Biology · L5 · Bottom-Up Proteomics Workflow

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Biology · L5 · Bottom-Up Proteomics Workflow

Flowchart9 objects

Biology

Biology · L3 · Biodiversity and Conservation Quiz · flowchart

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Biology · L3 · Biodiversity and Conservation Quiz · flowchart

Note~486 words · 2 min

The Muscular System Muscle tissue is specialized to contract, or shorten, converting chemical energy into mechanical force. The human body contains three distinct types of muscle tissue, each built for a different job: skeletal muscle for v

Biology

Biology · L3 · The Muscular System

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Biology · L3 · The Muscular System

Note~1203 words · 6 min

Developmental Biology: From Fertilization to Body Plan Developmental biology asks how a single fertilized egg, with no apparent structure beyond its own molecular contents, reliably builds a complex, patterned, multicellular organism. The a

Biology

Developmental Biology: From Fertilization to Body Plan

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Developmental Biology: From Fertilization to Body Plan

Quiz5 questions

What shape is a DNA molecule?

AA flat sheetBA twisted ladder, called a double helixCA perfect circleDA single straight line

Biology

Biology · L2 · What Is DNA? Quiz

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Biology · L2 · What Is DNA? Quiz

Collection4 items

01Biology · L5 · Mechanisms of Neurodegeneration

02Biology · L5 · Mechanisms of Neurodegeneration

03Biology · L5 · C9orf72 Repeat Expansion Toxicity Pathways

+1 more

Biology

Biology · L5 · Mechanisms of Neurodegeneration

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Biology · L5 · Mechanisms of Neurodegeneration

Flowchart9 objects

Biology

Biology · L5 · Phylogenomics and Comparative Genomics · flowchart

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Biology · L5 · Phylogenomics and Comparative Genomics · flowchart

Note~375 words · 2 min

Comparative Vertebrate Body Plans Vertebrates — animals with a backbone — are grouped into five major classes: fish, amphibians, reptiles, birds, and mammals. Every vertebrate shares the same basic body plan, but each class evolved differen

Biology

Biology · L3 · Comparative Vertebrate Body Plans

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Biology · L3 · Comparative Vertebrate Body Plans

Flashcards10 cards

What problem do molecular chaperones solve, and why is co-translational folding especially vulnerable to this problem?1 / 10

A nascent polypeptide emerging from the ribosome exposes hydrophobic core residues that, in the folded native state, would be buried away from solvent. In the crowded cytoplasm (protein concentrations of 200–300 mg/mL), these exposed hydrophobic surfaces are strongly prone to non-specific aggregation with other unfolded or partially folded chains before folding can complete.

Biology

Biology · L5 · Molecular Chaperones & Protein Quality Control

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Biology · L5 · Molecular Chaperones & Protein Quality Control

Flowchart18 objects

Biology

Biology · L4 · DNA replication: key enzymes and the replication fork

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Biology · L4 · DNA replication: key enzymes and the replication fork

Quiz5 questions

According to the chemiosmotic hypothesis, what directly powers ATP synthesis by ATP synthase?

ADirect transfer of a high-energy phosphate intermediate from Complex IV to ATP synthase.BThe electrochemical proton gradient (proton-motive force) generated across the inner mitochondrial membrane by electron-transport-chain proton pumping, dissipated as protons flow back through ATP synthase.CDirect enzymatic transfer of electrons from NADH to ADP.DHeat released by the electron transport chain.

Biology

Biology · L5 · Advanced Mitochondrial Bioenergetics

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Biology · L5 · Advanced Mitochondrial Bioenergetics

Flowchart8 objects

Biology

How Seasons Change Plants and Animals · flowchart

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How Seasons Change Plants and Animals · flowchart

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