Free Practice Questions for the WGU Courses and Certificates Introduction-to-Biology Exam (2026 Updated)

Caribou dig through snow to find food. Afterward, arctic foxes use the fresh holes to search for their own food. What interaction occurs?

What is the name of the structure that joins two sister chromatids together?

The human MN blood group is determined by two codominant alleles ( M and N ). In one family, all offspring are MN . What are the most probable genotypes of the parents?

A cell is bounded by a cell wall and has an organelle that performs photosynthesis . Which type of eukaryotic cell and organelle are described?

Which statement is true about the organisms on the vertebrate cladogram?

Refer to the diagram “Arctic Marine System Components.”

Which components in the figure are abiotic ?

The Boreal forest includes trees (pine, spruce) and animals (lynx, elk) harvested for energy, food, or trade. Which activity would negatively impact biodiversity there?

Using the Tetrapod Cladogram (Node E) and standard vertebrate traits, which two character states are shared by both Tiger and Gorilla ? (Choose 2 answers)

Which molecule is an input to the light-dependent reactions of photosynthesis?

A species of fish can have dominant red fins (R) or recessive white fins (r) , and dominant long fins (L) or recessive short fins (l) . In a dihybrid cross , each parent is heterozygous for both traits (RrLl × RrLl). How many different gamete genotypes can each parent produce?

Using the Tetrapod Cladogram (Node E) , the common ancestor at location E gives rise to which two organisms? (Choose 2 answers)

What is the process in which microbes convert glucose, in the absence of oxygen , into two ethanol molecules and two carbon dioxide molecules?

A horticulturalist crosses two pink carnations. Flower color shows incomplete dominance : red × white → pink heterozygotes. The observed phenotype ratio is 2:1:1 . Which color ordering corresponds to this ratio?

A gardener performs a monohybrid cross on two heterozygous orange-fruited tomato plants. The recessive phenotype is yellow fruit. What percentage of offspring will produce yellow tomatoes?

A farmer breeds sheep for disease resistance and fine wool . After decades, the flock consistently shows both traits. Which evolutionary mechanism changed the flock’s gene pool?

In a multigeneration family study, 8% of males and far fewer females show a trait (e.g., red hair). What is the most likely cause?

Glycolysis yields a net of two ATP molecules produced by phosphorylation. Which statement about the energy transformation in this process is true?

Transcription of RNA from DNA occurs in which eukaryotic organelle ?

Which molecule is produced by photosynthesis?

A researcher studies an organism with these traits: ~0.3 μm size, cell membrane enclosing contents, free ribosomes in cytoplasm, and genetic material loosely distributed in the cytoplasm. Which statement is true?