Which of the following is true of prokaryotes?
A. Prokaryotes have a nucleus.
B. Prokaryotes are single-celled.
C. Prokaryotes do not have a chromosome.
D. Prokaryotes have membrane-bounded organelles.
E. Prokaryotes do not have ribosomes.
Answer: B. Prokaryotes are single-celled.
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What types of data can be used to construct phylogenies such as the one above?
A. molecular data B. fossil evidence C. anatomical, physiological and developmental studies of extant species D. molecular data, fossil evidence and anatomical, physiological and developmental studies of extant species E. None of the answers given above are correct.
Establishment of lysogeny by phage is usually influenced strongly by ________.
A. the physiological condition of the host at the time of infection B. the previous host infected by the virus C. components of the host replication machinery D. None of the choices are correct.
As an example of the relationship between structure and function the forward-facing eyes shared by all primates help them in
A) manipulating small objects. B) depth perception as they navigate through forests. C) swinging from tree branches. D) seeing in the dark.
What are some of the hazards of smoking? What methods might society employ to try to reduce the number of people exposed to secondhand smoke?
What will be an ideal response?