Occasionally when doing Serologic Testing to identify strains of Salmonella isolates, the test for different O Antigens is negative. What is the most likely explanation?

What will be an ideal response?


the K Antigens are masking the O Antigens

Biology & Microbiology

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Certain species of Bacteria have been identified to cause obesity

Indicate whether the statement is true or false.

Biology & Microbiology

Each branch point or node of a phylogenetic tree represents:

A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.

Biology & Microbiology

Microscopically, this fungus appears barrel shaped with thick walls, which best describes which type of conidia?

a. Macroconidia b. Chlamydoconidia c. Arthroconidia d. Blastoconidia

Biology & Microbiology

Suppose sugar is removed from an excretory system tubule and returned to the blood. This would be an example of

____.

a. reabsorption b. excretion c. filtration d. secretion e. diffusion

Biology & Microbiology