Inside the Cell
Famously known as the "powerhouse of the cell," this organelle generates chemical energy.
A: What is the mitochondria?
This system acts as your body's structural framework, containing exactly 206 bones in an adult.
A: What is the skeletal system?
This twisted, ladder-shaped molecule carries all the genetic instructions for building a living thing.
A: What is DNA?
Human teeth are incredibly strong, matching the exact hardness level of this apex ocean predator's teeth.
A: What is a shark?
Animals like frogs and toads that can live both underwater using gills and on land using lungs belong to this group.
A: What are amphibians?
Acting like the cell's brain or control tower, this large organelle holds all the cell's DNA.
A: What is the nucleus?
This muscular pump beats roughly 100,000 times a day to push blood through your body.
A: What is the heart?
This type of genetic trait will always show up in an offspring if even one copy is passed down from a parent.
A: What is a dominant trait?
This is the only mammal capable of true, sustained flapping flight (no, flying squirrels just glide!).
A: What is a bat?
This term describes how an animal structurally or behaviorally changes over time to better survive in its environment (like a polar bear's white fur).
A: What is an adaptation?
Plant cells have these two unique structures that animal cells completely lack.
A: What are the cell wall and chloroplasts?
Your skin belongs to this oddly-named body system, which serves as your first line of defense.
A: What is the integumentary system (or skin system)?
If a scientist describes your physical appearance (like having blue eyes), they are talking about this "P-word."
A: What is a phenotype?
Water is weird because its solid form (ice) does this when placed in its liquid form.
A: What is floats?
This type of deep winter sleep allows animals like bears and groundhogs to conserve energy when food is scarce.
A: What is hibernation?
This jelly-like fluid fills the empty spaces inside a cell and holds all the organelles in place.
A: What is cytoplasm?
These tiny, microscopic air sacs in your lungs are where oxygen actually enters your bloodstream.
A: What are alveoli?
Gregor Mendel famously discovered the laws of genetics in the 1860s by breeding generations of this vegetable.
A: What are pea plants?
Despite having no brain, no bones, and no heart, this gelatinous ocean creature has survived on Earth for over 500 million years.
A: What is jellyfish?
This active defense mechanism is used by animals like cuttlefish and chameleons to blend seamlessly into their surroundings.
A: What is camouflage?
This selectively permeable barrier surrounds all cells, acting like a security guard that controls what goes in and out.
A: What is the cell membrane?
These elastic bands of tissue connect your bones to other bones at a joint (not to be confused with tendons!).
A: What are ligaments?
This grid-like diagram is used in biology to predict all the possible genetic outcomes of a cross between two parents.
A: What is a Punnett square?
This organ is the largest internal organ in the human body and is responsible for filtering toxins out of your blood.
A: What is the liver?
Unlike mammals, these cold-blooded vertebrates have dry scales, lay amniotic eggs on land, and include lizards and snakes.
A: What are reptiles?