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________ are protozoan cells in their growing and feeding stage.

One or more answers may be correct. At what cellular activity are you likely to get a trisomy 21?

Match the description with the organism 

Staphylococcus belong to the class Bacilli even though they have a coccus shape

This genus is a Gram negative alpha proteobacteria. It forms symbiotic relationships with plants, living in their roots and fixing nitrogen.

This organism is a Gram negative rod. It is a facultative anaerobe. It can ferment lactose. Some strains have mutualistic relationships with humans while others are pathogenic. Some pathogens can produce Shiga toxin.

Environments that oligotrophs could be found in include ocean sediment and glacial ice.

Match the description with the organism

This genus includes Gram negative micro-aerophiles. Some species cause human GI infections like gastritis.

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