Which organism is killed by atmospheric oxygen?

A. facultative anaerobe
B. obligate aerobe
C. obligate anaerobe
D. aerotolerant anaerobe


Ans: C. obligate anaerobe

Biology & Microbiology

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Cells may need to respond to changes that occur rapidly in their environment. Which of the following is the most rapid response that cells can use to change the activities of gene products?

A. covalent modification of proteins B. alter the transcription levels of genes C. change the rate of protein transport D. modify the chromatin structure around genes

Biology & Microbiology

Neurons may be classified by their morphology (shape). Alpha motor neurons consist of 1 axon with many dendritic trees. Which type of morphology does this describe?

a. Multipolar b. Bipolar c. Pseudounipolar d. Interneuron

Biology & Microbiology

Which of the following is NOT characteristic of the glycocalyx found in bacteria?

a. a structure that can be visualized using an acidic negative stain and a basic counterstain b. if firmly attached, contributes to bacterial virulence c. creates a slimy, slippery coating that prevents bacteria from attaching to surfaces d. a viscous coating surrounding the cell made of polysaccharide, polypeptide, or both

Biology & Microbiology

The sequence of amino acids in a protein is known as the protein’s ________ structure

a. quaternary b. secondary c. tertiary d. primary

Biology & Microbiology