____ is a typical photolithoautotroph. A: Sulfur oxidizing bacteria B: Iron oxidizing bacteria C: Cyanobacteria D: Purple non-sulfur bacteria

”革兰氏阳性菌” A: Gram-positive bacteria B: Gram-negative bacteria C: Gram-negative virus

Gram-positive bacteria can be differentiated from Gram-negative bacteria since the peptidoglycan layer comprises 10% of the cell wall

The main purpose of semi-solid medium is (). A: Check the motility of bacteria B: Check the ability of bacteria to metabolize glucose to produce acid and gas C: Check the ability of bacteria to metabolize tryptophan to produce indole D: None of the above

Which is the most common bacteria in aspiration pneumonia? () A: staphylococcus B: anaerobic bacteria C: streptococcus pneumonia D: pseudomonas aeruginosa E: fungus

3-2。What factors do affect the amount of the bacteria grows in packaged food？（ ） A: The type of the packaged food B: Temperature and time C: The structure of bacteria

Exactly which bacteria cause the ______ is still unknown.

The number of phyla of Gram-positive and Gram-negative bacteria are similar.

Which of the following bacteria help with human digestion?

The skin is susceptible to physical injury and to ____by bacteria, virus,etc.