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