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Which of the following are true of all viruses? Choose all correct responses.

_______ microscopy is often used to observe spirochetes because they are hard to stain.

Mycoplasmas are classified as Low G+C Gram-positive bacteria

These photosynthesizing bacteria are commonly called blue green algae. They are responsible for creating an oxygen rich atmosphere on Earth billions of years ago.

A eukaryotic pathogen that is unicellular, flagellated, and lacks cell walls could be which of the following?

E. coli reside in the human gut. We provide them with nutrients, they produce vitamin K for us. This is an example of:

 All protozoans possess:

Halobacterium would prefer which environment?

This vibrio shaped, aquatic bacterium causes profuse, watery diarrhea.

Suppose Country A has a GDP of $1,000 billion growing at 4% annually. Using the rule of 70, approximately how many years will it take for GDP to double?