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Biodiversity and classification
9 MDCAT Biology questions with answers and explanations.
Printable worksheet with answer key
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Binomial nomenclature was introduced by:
- 1 Charles Darwin
- 2 Robert Whittaker
- 3 Carolus Linnaeus
- 4 Aristotle
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Correct answer: Carolus Linnaeus
Linnaeus gave every species a two-part Latin name made of the genus and the species.
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Which is the largest of these taxonomic groups?
- 1 Order
- 2 Genus
- 3 Class
- 4 Family
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Correct answer: Class
The ranks go from largest to smallest as class, order, family, genus and species.
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Viruses are often considered non-living because they:
- 1 Cannot reproduce outside a host cell
- 2 Have a cell wall
- 3 Contain no genetic material
- 4 Are too small to see
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Correct answer: Cannot reproduce outside a host cell
A virus has no metabolism of its own and can multiply only by using the machinery of a host cell.
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Which kingdom has cell walls made of chitin?
- 1 Fungi
- 2 Protista
- 3 Monera
- 4 Plantae
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Correct answer: Fungi
Fungal cell walls contain chitin. Plant cell walls are made of cellulose.
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Bacteria usually reproduce by:
- 1 Budding only
- 2 Binary fission
- 3 Mitosis
- 4 Meiosis
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Correct answer: Binary fission
A bacterial cell copies its DNA and then divides into two identical cells by binary fission.
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A virus that infects bacteria is called a:
- 1 Prion
- 2 Viroid
- 3 Retrovirus
- 4 Bacteriophage
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Correct answer: Bacteriophage
Bacteriophages, or phages, infect bacteria. T4 is a well-known example.
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Which group of animals has jointed legs and an exoskeleton of chitin?
- 1 Mollusca
- 2 Cnidaria
- 3 Arthropoda
- 4 Annelida
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Correct answer: Arthropoda
Insects, spiders and crustaceans are arthropods, with jointed appendages and a chitin exoskeleton.
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Which of these is a gymnosperm?
- 1 Maize
- 2 Mango
- 3 Rose
- 4 Pinus
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Correct answer: Pinus
Pinus, the pine, has naked seeds in cones. Mango, maize and rose are flowering plants.
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Methanogens and halophiles are members of which group?
- 1 Archaea
- 2 Bacteria
- 3 Protozoa
- 4 Fungi
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Correct answer: Archaea
These extremophiles belong to the domain Archaea, which is separate from the true bacteria.