IB Biology Practice Test Quiz

40 Questions | Total Attempts: 947

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IB Biology Practice Test Quiz

You might be just starting in your studies on biology, or you might be gearing up for your finals, but either way, you can never be too prepared for a test on the scientific study of life! The topic looks at a broad range of life’s aspects from human reproduction to the physical makeup of our bodies and the other organisms in the world. What can you tell us about biology? Let’s find out.


Questions and Answers
  • 1. 
    The lengths of a sample of tiger canines were measured. 68 % of the lengths fell within a range between 15 mm and 45 mm. The mean was 30 mm. What is the standard deviation of this sample?
    • A. 

      5 mm

    • B. 

      15 mm

    • C. 

      7.5 mm

    • D. 

      30 mm

  • 2. 
    Which of the following are features of prokaryotes and eukaryotes? 70S ribosomes 80S ribosomes Naked DNA DNA associated with proteins 70S ribosomes         80S ribosomes           Naked DNA           DNA associatedwith proteins
    • A. 

      Prokaryote          eukaryote            prokaryote                eukaryote

    • B. 

      Eukaryote           prokaryote           eukaryote                 prokaryote

    • C. 

      Eukaryote          prokaryote           prokaryote                    eukaryote

    • D. 

      Prokaryote       eukaryote          eukaryote                        prokaryote

  • 3. 
    Which statement is part of the cell theory? .
    • A. 

      Cells are composed of organic molecules.

    • B. 

      Cells have DNA as their genetic material

    • C. 

      Cells have cytoplasm surrounded by a membrane.

    • D. 

      Cells come from pre-existing cells.

  • 4. 
    What route is used to export proteins from the cell?
    • A. 

      Golgi apparatus → rough endoplasmic reticulum → plasma membrane

    • B. 

      Rough endoplasmic reticulum → Golgi apparatus → plasma membrane

    • C. 

      Golgi apparatus → lysosome → rough endoplasmic reticulum

    • D. 

      Rough endoplasmic reticulum → lysosome → Golgi apparatus

  • 5. 
    Which of the following take(s) place during either interphase or mitosis in animal cells? I. Re-formation of nuclear membranes II. Pairing of homologous chromosomes III. DNA replication
    • A. 

      I only

    • B. 

      I and II only

    • C. 

      II and III only

    • D. 

      I and III only

  • 6. 
    Which substance in prokaryotes contains sulfur?
    • A. 

      DNA

    • B. 

      Phospholipids

    • C. 

      Proteins

    • D. 

      Antibiotics

  • 7. 
    Which describes these molecules correctly?       I                                                          II
    • A. 

      Ribose                                           aminoacid

    • B. 

      Glucose                                           aminoacid

    • C. 

      Ribose                                                  fatty acid

    • D. 

      Glucose                                                fatty acid

  • 8. 
    What sequence of processes is carried out by the structure labelled X during translation?
    • A. 

      Combining with an amino acid and then binding to an anticodon

    • B. 

      Binding to an anticodon and then combining with an amino acid

    • C. 

      Binding to a codon and then combining with an amino acid

    • D. 

      Combining with an amino acid and then binding to a codon

  • 9. 
    The diagram below shows a biochemical pathway in a yeast cell. Which of the following correctly identifies a compound in te diagram?
    • A. 

      I is fat.

    • B. 

      II is pyruvate

    • C. 

      III is lactate.

    • D. 

      IV is carbon dioxide.

  • 10. 
    Which of the following factors influence(s) the rate of oxygen production in photosynthesis? I. Temperature II. Wavelength of light III. Number of mitochondria
    • A. 

      I only

    • B. 

      I and II only

    • C. 

      II and III only

    • D. 

      I, II and III

  • 11. 
    In some people, hemoglobin always contains the amino acid valine in place of a glutamic acid at one position in the protein. What is the cause of this?
    • A. 

      An error in transcription of the hemoglobin gene

    • B. 

      An error in translation of the mRNA

    • C. 

      Lack of glutamic acid in the diet

    • D. 

      A base substitution in the hemoglobin gene

  • 12. 
    What is a suspected heterozygous individual crossed with in a test cross?
    • A. 

      Homozygous dominant

    • B. 

      Homozygous recessive

    • C. 

      Heterozygous dominant

    • D. 

      Heterozygous recessive

  • 13. 
    Which of the following genotypes is possible in the offspring of a homozygous male with blood group A and a female with blood group?
    • A. 
    • B. 
    • C. 
    • D. 
  • 14. 
    What type of inheritance is shown in this pedigree chart?
    • A. 

      X-linked dominant

    • B. 

      Y-linked dominant

    • C. 

      X-linked recessive

    • D. 

      Y-linked recessive

  • 15. 
    What is a community?
    • A. 

      . A group of organisms living and interacting in the same trophic level

    • B. 

      A group of populations living and interacting in a food chain

    • C. 

      A group of organisms of the same species living and interacting in an ecosystem

    • D. 

      A group of populations living and interacting in an area

  • 16. 
    What are the units of a pyramid of energy?
    • A. 
    • B. 
    • C. 
    • D. 
  • 17. 
    Population size is influenced by certain factors.If I = immigration, E = emigration, N = natality, M = mortality and (N + M) = (I + E) = 0, which phase is this population in?
    • A. 

      Exponential phase

    • B. 

      Transitional phase

    • C. 

      Plateau phase

    • D. 

      Growth phase

  • 18. 
    An animal has radial symmetry, a sac-like body with only one opening and tentacles with stinging structures. To which phylum does this animal belong?
    • A. 

      Annelida

    • B. 

      Cnidaria

    • C. 

      Mollusca

    • D. 

      Porifera

  • 19. 
    Which of the following are used as evidence for evolution? I. Homologous structures II. Selective breeding of domesticated animals III. Overproduction of offspring
    • A. 

      I and II only

    • B. 

      I and III only

    • C. 

      II and III only

    • D. 

      I, II and III

  • 20. 
    Which of the following is correct for lipase? Substrate             Source                 pH optimum
    • A. 

      Triglycerides        pancreas             pH = 8

    • B. 

      Fatty acids         small intestine          pH = 7

    • C. 

      Triglycerides    small intestine         pH = 9

    • D. 

      Fatty acids         pancreas           pH = 9

  • 21. 
    What prevents antibiotics from being effective against viruses?
    • A. 

      Viruses have a high rate of mutation.

    • B. 

      Viruses have no RNA

    • C. 

      Viruses have no metabolism.

    • D. 

      Viruses have a protein shell that protects them.

  • 22. 
    The diagram below shows the human heart. What structures are indicated by the labels X, Y and Z? X                Y                 Z
    • A. 

      Left atrium           aorta            semi-lunar valve

    • B. 

      Left atrium            aorta              atrio-ventricular valve

    • C. 

      Right atrium        pulmonary artery        atrio-ventricular valve

    • D. 

      Right atrium          pulmonary artery           semi-lunar valve

  • 23. 
    Which muscles contract to cause air to pass into the lungs through the trachea?
    • A. 

      Internal intercostal muscles and diaphragm

    • B. 

      Internal intercostal muscles and abdomen wall muscles

    • C. 

      External intercostal muscles and diaphragm

    • D. 

      External intercostal muscles and abdomen wall muscles

  • 24. 
    The diagram below shows the changes in membrane potential during an action potential. What occurs at the stages labelled 1 and 2?         1                                                           2
    • A. 

      Na+ ions diffuse in;                                    K+ ions diffuse out;                                                          inside becomes more positive                     i nside becomes more negative

    • B. 

      K+ ions diffuse out;                                 Na+ ions diffuse in; inside becomes more negative                inside becomes more positive

    • C. 

      Na+ ions diffuse out;                                 K+ ions diffuse out; inside becomes more negative                 inside becomes more positive

    • D. 

      Na+ ions diffuse in;                                K+ ions diffuse in; inside becomes more positive                inside becomes more negative

  • 25. 
    What are the roles of testosterone in males?
    • A. 

      . Stimulation of FSH production and growth in puberty

    • B. 

      Pre-natal development of genitalia and development of secondary sexual characteristics

    • C. 

      Development of genitalia and pre-natal secondary sexual characteristics

    • D. 

      Stimulation of FSH production and pre-natal development of secondary sexual characteristics

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