Biology Test Study Guide 2026
Everything you need to pass the Biology Test exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 Biology Test Exam Format at a Glance
📚 Biology Test Topics to Study (69)
✍️ Sample Biology Test Questions & Answers
1. What is the purpose of the ubiquitin-proteasome pathway?
Ubiquitin molecules are attached to proteins marked for destruction, directing them to the proteasome where they are degraded into peptides.
2. Which term describes organisms that live suspended or swimming in open water, unable to overcome currents?
Plankton are organisms that drift with ocean currents and include both phytoplankton (photosynthetic) and zooplankton (heterotrophic).
3. How does a testcross help determine whether an organism showing a dominant phenotype is homozygous or heterozygous?
Crossing with a homozygous recessive (aa) reveals the unknown genotype: if any offspring show the recessive phenotype, the parent is heterozygous.
4. A patient develops symptoms 48–72 hours after exposure to an antigen. Which type of hypersensitivity is most likely?
Type IV hypersensitivity is T cell-mediated and takes 48–72 hours to develop, as seen in contact dermatitis and the tuberculin skin test.
5. Which type of RNA carries amino acids to the ribosome during translation?
Transfer RNA (tRNA) carries specific amino acids to the ribosome, matching anticodons to mRNA codons.
6. What is the primary function of chloroplasts in plant cells?
Chloroplasts are the organelles responsible for photosynthesis, converting light energy into chemical energy (glucose) using carbon dioxide and water.