Viruses contain DNA or RNA, but lack genes necessary for metabolism and reproduction. Why are viruses not considered to be alive?
A. Viruses are unable to reproduce independently of a host.
B. Viruses do not have the ability to evolve in their environment.
C. Viruses do not contain internal organelles.
D. Viruses do not contain nucleic acids.
A
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Mycobacterium leprae is typically found infecting the ears, toes, and fingers of its host due to its
A. requirement for well-oxygenated blood. B. easy access to those parts. C. need for cooler temperatures. D. long incubation period.
How did Hans Krebs discover the citric acid cycle?
What will be an ideal response?
Which type of meningitis is also a frequent cause of pneumonia?
a) Meningococcal meningitis b) Pneumococcal meningitis c) Listeriosis d) Haemophilus influenzae meningitis
Complete the analogy: ________ is/are to birds as ________ is/are to mammals
A) Wings; legs B) Water; milk C) Feathers; hair D) Wings; opposable thumbs