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OpenStem
@openstem · Joined Jul 2026
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Quiz5 questions
Which of the three basic bacteria shapes is round, like a tiny ball?
ACoccusBBacillusCSpirillumDStreptomycete
Biology · L2 · Bacteria Shapes Quiz
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Biology · L2 · Bacteria Shapes QuizQuiz5 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 · L2 · Plant Propagation Without Seeds Quiz
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Biology · L2 · Plant Propagation Without Seeds QuizQuiz5 questions
Which of these is one of the main reasons a body's cells divide?
AGrowthBDigesting foodCProducing soundDStoring memories
Biology · L2 · The Cell Cycle: Why and How Cells Divide Quiz
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Biology · L2 · The Cell Cycle: Why and How Cells Divide QuizQuiz5 questions
What is melanin?
AA pigment made by skin cells that gives skin, hair, and eyes their colorBA vitamin the skin absorbs from sunlightCA layer of dead skin cells on the surface of the bodyDA type of muscle found in the dermis
Biology · L2 · Skin Color and Melanin Quiz
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Biology · L2 · Skin Color and Melanin QuizQuiz5 questions
Which vaccine type is made from a living but very weakened form of the germ?
AWeakened (live-attenuated) vaccineBInactivated vaccineCmRNA vaccineDNone of the above
Biology · L2 · Vaccine Types Quiz
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Biology · L2 · Vaccine Types QuizQuiz5 questions
What is actually stored inside a camel's hump?
AWaterBFatCAirDMuscle
Biology · L2 · How Desert Animals Conserve Water Quiz
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Biology · L2 · How Desert Animals Conserve Water QuizQuiz5 questions
What is an antigen?
AA protein made by white blood cells to attack germsBA marker on the surface of an invader that the immune system can recognizeCA type of germ that only lives in waterDThe scar left behind after a cut heals
Biology · L2 · Antibodies and the Lock-and-Key Idea Quiz
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Biology · L2 · Antibodies and the Lock-and-Key Idea QuizQuiz5 questions
What happens if you touch poison ivy?
AYou get stung by tiny hairsBYou get an itchy, blistering rash from its oily sapCYou get poked by sharp spikesDNothing happens at all
Biology · L2 · Simple Plant Defenses Quiz
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Biology · L2 · Simple Plant Defenses QuizQuiz5 questions
Which part of a neuron receives signals coming in from other neurons?
AThe axonBThe dendriteCThe synapseDThe myelin sheath
Biology · L2 · How Nerve Cells Send Messages Quiz
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Biology · L2 · How Nerve Cells Send Messages QuizQuiz5 questions
What is the correct order of steps a scientist typically follows to name a new species?
APublish, Study, Compare, Name, FindBFind, Study, Compare, Name, PublishCName, Find, Study, Publish, CompareDStudy, Find, Name, Compare, Publish
Biology · L2 · Naming a New Species Quiz
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Biology · L2 · Naming a New Species QuizQuiz5 questions
Which organelle is responsible for modifying, sorting, and packaging proteins received from the endoplasmic reticulum?
AGolgi apparatusBLysosomeCMitochondrionDNucleolus
Biology · L3 · Cell Biology Quiz
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Biology · L3 · Cell Biology QuizQuiz5 questions
In pea plants, purple flower color (P) is dominant over white flower color (p). What is the genotype of a heterozygous purple-flowered plant?
APPBPpCppDCannot be determined from the phenotype alone
Biology · L3 · Genetics and Heredity Quiz
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Biology · L3 · Genetics and Heredity QuizQuiz5 questions
Which base pairs with adenine in a DNA molecule?
AGuanineBThymineCCytosineDUracil
Biology · L3 · DNA Structure and Replication Quiz
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Biology · L3 · DNA Structure and Replication QuizQuiz5 questions
Which of the following is NOT one of the three requirements for natural selection to act on a trait?
AThe trait must vary among individuals in the populationBThe trait must be heritableCThe trait must affect survival or reproductive successDThe trait must appear in every member of the population
Biology · L3 · Evolution and Natural Selection Quiz
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Biology · L3 · Evolution and Natural Selection QuizQuiz5 questions
Which structure is known as the heart's natural pacemaker?
AThe AV nodeBThe SA nodeCThe septumDThe mitral valve
Biology · L3 · The Circulatory System
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Biology · L3 · The Circulatory SystemQuiz5 questions
Which structure keeps the trachea held open despite pressure changes during breathing?
ASmooth muscle in the bronchiolesBC-shaped rings of cartilageCThe pleural membraneDThe epiglottis
Biology · L3 · The Respiratory System
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Biology · L3 · The Respiratory SystemQuiz5 questions
Which enzyme, secreted in saliva, begins the chemical digestion of starch in the mouth?
APepsinBSalivary amylaseCLipaseDTrypsin
Biology · L3 · The Digestive System
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Biology · L3 · The Digestive SystemQuiz5 questions
Which part of a neuron receives signals from other neurons?
AAxonBDendriteCMyelin sheathDSynapse
Biology · L3 · The Nervous System
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Biology · L3 · The Nervous SystemQuiz5 questions
Which of the following is a feature of innate immunity, but not adaptive immunity?
AIt responds the same way to any pathogen, without needing prior exposureBIt produces antibodies specific to one antigenCIt creates memory cells that persist for yearsDIt becomes faster and stronger after a second exposure
Biology · L3 · The Immune System Quiz
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Biology · L3 · The Immune System QuizQuiz5 questions
Which gland is often called the "master gland" because it controls the activity of several other endocrine glands?
AThyroid glandBPituitary glandCAdrenal glandDPancreas
Biology · L3 · The Endocrine System Quiz
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Biology · L3 · The Endocrine System QuizQuiz5 questions
Which bone tissue forms the dense outer layer of bones and is organized into structural units called osteons?
ASpongy boneBCompact boneCArticular cartilageDRed bone marrow
Biology · L3 · The Skeletal System Quiz
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Biology · L3 · The Skeletal System QuizQuiz5 questions
Which muscle type is striated, under voluntary control, and attached to bone by tendons?
ASkeletal muscleBSmooth muscleCCardiac muscleDConnective tissue
Biology · L3 · The Muscular System
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Biology · L3 · The Muscular SystemQuiz5 questions
Which structure surrounds the glomerulus and collects the fluid filtered out of it?
AThe renal tubuleBBowman's capsuleCThe collecting ductDThe ureter
Biology · L3 · The Excretory System
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Biology · L3 · The Excretory SystemQuiz5 questions
Which structure produces both ova and the hormones estrogen and progesterone?
AThe fallopian tubeBThe uterusCThe ovaryDThe cervix
Biology · L3 · The Reproductive System
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Biology · L3 · The Reproductive SystemQuiz5 questions
Which structural feature causes Gram-positive bacteria to stain purple in a Gram stain?
AA thick peptidoglycan cell wall that retains crystal violet dyeBA thin peptidoglycan layer with an outer lipid membraneCA plasmid carrying resistance genesDA flagellum used for movement
Biology · L3 · Microbiology
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Biology · L3 · MicrobiologyQuiz5 questions
Where inside a chloroplast do the light-dependent reactions take place?
AThe stromaBThe thylakoid membraneCThe outer membraneDThe cell wall
Biology · L3 · Plant Biology
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Biology · L3 · Plant BiologyQuiz5 questions
A forest can support at most about 200 deer given its food and water supply. This maximum sustainable population size is known as the forest's:
ALimiting factorBCarrying capacityCTrophic levelDBiotic potential
Biology · L3 · Ecology and Ecosystems Quiz
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Biology · L3 · Ecology and Ecosystems QuizQuiz5 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 · L3 · Taxonomy and Classification Quiz
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Biology · L3 · Taxonomy and Classification QuizQuiz5 questions
Which pair correctly matches a macromolecule with its monomer?
ALipid — glycerolBProtein — amino acidCNucleic acid — monosaccharideDCarbohydrate — nucleotide
Biology · L3 · Biochemistry Quiz
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Biology · L3 · Biochemistry QuizQuiz5 questions
Where in the cell does glycolysis take place?
AThe cytoplasmBThe mitochondrial matrixCThe inner mitochondrial membraneDThe nucleus
Biology · L3 · Cellular Respiration in Detail Quiz
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Biology · L3 · Cellular Respiration in Detail Quiz