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Biology: explore STEM content (page 10 of 50) · openstem
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.
Innate behavior (also called instinctive behavior) is behavior an animal performs correctly the very first time, without ever having been taught or having practiced it. It is inherited, genetically programmed, and shows up in every normal member of a species.
Biology
Biology · L3 · Innate Behavior and Fixed Action Patterns
What are baroreceptors, and where are they located?1 / 10
Baroreceptors are stretch-sensitive nerve endings located mainly in the walls of the carotid sinuses and the aortic arch. They detect changes in blood pressure by sensing how much the vessel wall stretches.
AOne species adapting to a fixed physical environment, like temperature or rainfallBTwo species exerting reciprocal selection pressure on each other over generations, so a change in one favors a counter-change in the otherCA single species evolving in complete isolation from all other speciesDA sudden, one-time genetic mutation that appears in two species at once
How Plants Protect Themselves Without Moving Plants cannot run away from a hungry animal or a careless footstep. So instead of moving, many plants protect themselves in a simpler way: they make themselves unpleasant to touch or eat. A plant
Biology
Biology · L2 · How Plants Protect Themselves Without Moving
AA single reproductive spore released by a fungusBThe branching mass of hyphae that forms the main feeding body of a fungusCThe cap of a mushroom that releases sporesDA mutualistic partnership between a fungus and a plant root
Biology
Biology · L3 · Fungi: Decomposers, Partners, and Pathogens
Population Genomics and Selection Population genomics reconstructs the demographic history and selective forces that have shaped a species' genome by comparing the observed pattern of genetic variation across many individuals to the expecta
Endocytosis and Exocytosis: Moving Bulk Material Across the Membrane Cells sometimes need to move material that is too large, or too abundant, to pass through a membrane channel or pump one molecule at a time — a whole bacterium, a mouthful
Biology
Biology · L3 · Endocytosis and Exocytosis: Moving Bulk Material Across the Membrane
Why Structure Determination Is Not One Method No single experimental technique dominates structural biology, because each imposes different physical requirements on the sample and reports on a different aspect of conformational reality. X-r
Biology
Biology · L5 · Determining Structure, Then Quality-Controlling It: From Diffraction to Chaperone-Mediated Folding
During the denaturation step of a PCR cycle, what actually happens to the DNA?
ADNA polymerase extends the primers into new strands.BThe double-stranded DNA is heated, breaking hydrogen bonds and separating the strands.CPrimers bind to their complementary sequences on the template.DThe reaction is cooled to allow the new strand to fold correctly.
Biology
Biology · L4 · Biotechnology and Recombinant DNA Quiz
Chromatin and 3D Genome Organization The genome is folded within the nucleus in a hierarchical, functionally consequential three-dimensional architecture — from megabase-scale compartments down to individual enhancer-promoter loops — that c
Biology
Biology · L5 · Chromatin and 3D Genome Organization
What is the difference between mechanical and chemical digestion?1 / 9
Mechanical digestion physically breaks food into smaller pieces (chewing, churning) without changing its chemical structure. Chemical digestion uses enzymes to break chemical bonds, converting large molecules into smaller absorbable units.
Biology
Biology · L3 · Mechanical, Chemical Digestion, and Absorption
Skin and Kidneys: Getting Rid of Waste Every day, your body's cells make waste products it doesn't need — extra water, salt, and a chemical called urea. If that waste built up, it would make you sick. The excretory system is the group of or
Biology
Biology · L2 · Skin and Kidneys: Getting Rid of Waste