A microorganism is discovered that contains DNA, ribosomes, and a plasma membrane but lacks a nucleus.  Which group does it belong to?

Animals classified under the phylum Echinodermata are known for their:

The process of nitrogen fixation is primarily carried out by:

A bacterium acquires  antibiotic resistance genes after directly connecting with another bacterium using a specialized structure.  Which structure is responsible?

What is the main benefit of vaccination?

A microbiologist observes bacteria with a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides.  What type of bacteria are these?

Which phylum includes animals that are characterized by a stinging cell called a nematocyst?

Match the following clinical indications for esophagrams and upper GI with their correct definition:

**Extra Credit (up to 2 points): What body position is this patient in and what projection was used? (There is no marker and the image is hung correctly)

The buccal cavity is another name for the: