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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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Collection3 items

01Biology · L5 · Systems Biology and Network Modeling

02Biology · L5 · Systems Biology and Network Modeling

03Biology · L5 · Systems Biology and Network Modeling

Biology

Biology · L5 · Systems Biology and Network Modeling

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Flashcards10 cards

What does a bird use its beak for?1 / 10

A bird uses its beak to catch, hold, tear, or crack its food. It also uses its beak to build nests and clean its feathers.

Biology

Biology · L1 · Bird Beaks: Shaped for the Job

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Quiz5 questions

What do we call an animal that only eats plants?

ACarnivoreBHerbivoreCOmnivoreDProducer

Biology

Biology · L1 · Food Chains in Nature Quiz

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Note~273 words · 1 min

How Ants Work Together An ant colony is like a busy team. Every ant has its own job, and all the jobs help the whole colony live and grow. The Queen Ant The queen ant is the only ant in the colony that lays eggs. She stays safe inside the n

Biology

Biology · L1 · How Ants Work Together

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Collection5 items

01Biology · L3 · Turgor Pressure and Plasmolysis

02Biology · L3 · Wilting and Whole-Plant Water Loss

03Biology · L3 · Plant Water Relations Quiz

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Biology

Biology · L3 · Plant Water Relations

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Flashcards10 cards

What ionic gradients does the Na+/K+ pump establish, and at what cost?1 / 10

The Na+/K+-ATPase pumps 3 Na+ out of the cell and 2 K+ in for every ATP hydrolyzed, against both ions' concentration gradients. This keeps Na+ concentrated outside the cell and K+ concentrated inside, establishing the steep electrochemical gradients that the resting potential and every subsequent phase of the action potential depend on.

Biology

Biology · L4 · The Action Potential in Ion-Channel Detail

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Quiz5 questions

What do we call the home a bird builds from twigs and grass?

ABurrowBNestCHiveDWeb

Biology

Biology · L1 · Animal Homes Quiz

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Flowchart9 objects

Biology

Biology · L3 · Photoperiodism: How Plants Sense Day Length · flowchart

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Flashcards9 cards

What is a baby dog called?1 / 9

A baby dog is called a puppy.

Biology

Baby Animals and Their Families

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Flashcards10 cards

What organ acts as the body's "thermostat" for temperature control?1 / 10

The hypothalamus, a small region at the base of the brain. It constantly monitors the temperature of the blood flowing through it and compares that reading to a set point of about 37°C, then triggers whatever response is needed to correct any difference.

Biology

Biology · L3 · The Body's Thermostat

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Collection5 items

01Biology · L2 · Chlorophyll and the Hidden Pigments

02Biology · L2 · Why Leaves Change Color in Autumn

03Biology · L2 · Leaf Pigments and Color Change Quiz

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Biology

Biology · L2 · Leaf Pigments and Color

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Flowchart10 objects

Biology

Biology · L5 · Quorum Sensing Feedback Loop

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Collection5 items

01Biology · L4 · Nephron Function In Depth

02Biology · L4 · Hormonal Regulation Of Fluid Balance

03Biology · L4 · Renal physiology: filtration, reabsorption, and hormonal control

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Biology

Biology · L4 · Renal Physiology

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Flashcards10 cards

What is a hormone?1 / 10

A hormone is a chemical messenger. A gland makes it and releases it into the blood, which carries it around the body to the cells and organs it affects.

Biology

Biology · L2 · What Are Hormones?

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Flashcards10 cards

What is the polymerase chain reaction (PCR), and why is it useful?1 / 10

PCR is an in vitro technique that exponentially amplifies a specific, targeted region of DNA, generating millions of copies from a trace starting sample. It underlies DNA fingerprinting, cloning, diagnostic testing, and sequencing workflows because most downstream techniques require far more DNA than a single cell provides.

Biology

Biology · L4 · Biotechnology — Core Lab Techniques

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Note~259 words · 1 min

Two Systems, One Team Your skeleton and your muscles never work alone — together they form the musculoskeletal system. Bones give your body a rigid frame and act as levers. Muscles attach to those bones with tendons and supply the pulling f

Biology

Biology · L2 · Your Bones and Muscles Team Up

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Flowchart11 objects

Biology

Biology · L2 · Why Leaves Change Color in Autumn · flowchart

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Collection5 items

01Biology · L2 · What Is Asexual Plant Propagation?

02Biology · L2 · Runners, Tubers, and Cuttings in Action

03Biology · L2 · Plant Propagation Without Seeds Quiz

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Biology

Biology · L2 · Plant Propagation Without Seeds

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Flashcards10 cards

What is the lymphatic system, in one sentence?1 / 10

A network of vessels and organs that collects excess fluid from body tissues, filters it for pathogens, and returns it to the bloodstream — while also playing a central role in immune defense.

Biology

Biology · L3 · Lymphatic Vessels and Fluid Return

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Flowchart9 objects

Biology

Biology · L4 · Respiratory Physiology · flowchart

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Flowchart5 objects

Biology

Biology · L2 · Herd Immunity: Protecting a Whole Community · flowchart

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Flashcards10 cards

In our cross, both parent flowers have the alleles "Pp". What color are both parents?1 / 10

Both parents are purple, since the dominant "P" allele in each one covers up its hidden recessive "p" allele.

Biology

Biology · L2 · Crossing Pp × Pp: Building One Punnett Square

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Flowchart9 objects

Biology

Biology · L2 · Reasons Cells Divide → Mitosis

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Quiz5 questions

Which animal group has fur or hair and feeds its babies milk?

ABirdsBFishCMammalsDInsects

Biology

Biology · L1 · Animal Groups

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Flashcards9 cards

What happens to your breathing rate during exercise, and why?1 / 9

Your breathing rate increases so your lungs can take in more oxygen and clear out carbon dioxide faster, keeping up with your muscles' higher demand for oxygen.

Biology

Biology · L2 · Exercise and the Oxygen Delivery Chain

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Flowchart12 objects

Biology

Biology · L1 · Four Ways Animal Parents Care for Their Young

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Flowchart7 objects

Biology

Biology · L1 · Plants Grow Toward the Light · flowchart

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Flowchart11 objects

Biology

Biology · L5 · Advanced Mitochondrial Bioenergetics · flowchart

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Note~598 words · 3 min

Biomechanics and Animal Locomotion Animal movement is governed by the same physics that governs any mechanical system: levers convert muscle force into limb motion, muscle itself has intrinsic force-generating limits that depend on both its

Biology

Biomechanics and Animal Locomotion

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Flashcards10 cards

What are the three types of muscle tissue in the human body?1 / 10

Skeletal muscle, smooth muscle, and cardiac muscle. Each has a distinct microscopic structure suited to its role.

Biology

Biology · L3 · The Three Types of Muscle Tissue

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Explore STEM Content

Biology

Explore STEM Content

Biology

Biology · L5 · Systems Biology and Network Modeling

Biology · L1 · Bird Beaks: Shaped for the Job

Biology · L1 · Food Chains in Nature Quiz

Biology · L1 · How Ants Work Together

Biology · L3 · Plant Water Relations

Biology · L4 · The Action Potential in Ion-Channel Detail

Biology · L1 · Animal Homes Quiz

Biology · L3 · Photoperiodism: How Plants Sense Day Length · flowchart

Baby Animals and Their Families

Biology · L3 · The Body's Thermostat

Biology · L2 · Leaf Pigments and Color

Biology · L5 · Quorum Sensing Feedback Loop

Biology · L4 · Renal Physiology

Biology · L2 · What Are Hormones?

Biology · L4 · Biotechnology — Core Lab Techniques

Biology · L2 · Your Bones and Muscles Team Up

Biology · L2 · Why Leaves Change Color in Autumn · flowchart

Biology · L2 · Plant Propagation Without Seeds

Biology · L3 · Lymphatic Vessels and Fluid Return

Biology · L4 · Respiratory Physiology · flowchart

Biology · L2 · Herd Immunity: Protecting a Whole Community · flowchart

Biology · L2 · Crossing Pp × Pp: Building One Punnett Square

Biology · L2 · Reasons Cells Divide → Mitosis

Biology · L1 · Animal Groups

Biology · L2 · Exercise and the Oxygen Delivery Chain

Biology · L1 · Four Ways Animal Parents Care for Their Young

Biology · L1 · Plants Grow Toward the Light · flowchart

Biology · L5 · Advanced Mitochondrial Bioenergetics · flowchart

Biomechanics and Animal Locomotion

Biology · L3 · The Three Types of Muscle Tissue