Match the following bacterial structures with the proper function
A) Flagellum 1) long, thin appendage used for motility
B) Pilus 2) hollow appendage used to transfer DNA between bacterial cells
C) Fimbriae 3) hairlike extensions that allow adhesion to surfaces.
Answer: A to 1, B to 2, C to 3
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An organism classified as a eukaryote could be which of the following?
A. a photoautotroph or a photoheterotroph B. a chemoheterotroph or a photoautotroph C. a photoheterotroph or a chemoheterotroph D. a chemoautotroph or a chemoheterotroph
A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Prokaryotic organisms would be abundant in sample A but absent from sample B. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would only occur in sample B. D. Eukaryotic organisms would be absent from sample A.
A human normally has how many vertebrae?
A. 33 B. 17 C. 12 D. 45
All viruses are helical.
Indicate whether the statement is true or false.