AP Biology practice questions

These five questions cover high-yield AP Biology ideas: cellular respiration, Mendelian genetics, mutations, photosynthesis and enzyme kinetics. Each one has a short explanation of why the right answer is right and why the most tempting wrong answer is wrong. When you're done, paste your own class notes or upload a PDF and we'll build a full practice test and flashcards from exactly what your teacher covered.

Question 1 of 5

In a eukaryotic cell, where does the citric acid (Krebs) cycle take place?

Question 2 of 5

Two heterozygous plants (Aa x Aa) are crossed. What fraction of the offspring is expected to be heterozygous?

Question 3 of 5

A point mutation changes a codon for an amino acid into a stop codon. What type of mutation is this?

Question 4 of 5

In oxygenic photosynthesis, the O2 released by the plant comes from which molecule?

Question 5 of 5

A competitive inhibitor is added to an enzyme-catalyzed reaction. Compared with no inhibitor, how do the kinetics change?

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