CLEP CLEP Biology Microbiology and Immunology 3

Question 1

Which bacteria form root nodules on legumes and fix atmospheric nitrogen into usable ammonia?

Accepted Answer

Rhizobium species

Answer

Escherichia coli

Answer

Staphylococcus aureus

Answer

Streptococcus pneumoniae

Question 2

Disease transmission involving an intermediate host organism such as a mosquito is called:

Accepted Answer

Vector-borne transmission

Answer

Direct contact transmission

Answer

Airborne transmission

Answer

Waterborne transmission

Question 3

Penicillin kills bacteria by which mechanism?

Accepted Answer

Inhibiting cell wall (peptidoglycan) synthesis

Answer

Disrupting the cell membrane

Answer

Inhibiting ribosomal protein synthesis

Answer

Blocking DNA replication

Question 4

Which category of bacteria absolutely requires oxygen for growth and cannot survive without it?

Accepted Answer

Obligate aerobes

Answer

Obligate anaerobes

Answer

Facultative anaerobes

Answer

Microaerophiles

Question 5

Koch's postulates were developed to:

Accepted Answer

Establish a causal link between a specific microorganism and a specific disease

Answer

Classify bacteria by Gram staining results

Answer

Measure antibiotic resistance patterns

Answer

Identify viral replication cycles

Question 6

Prions are unique infectious agents because they consist solely of:

Accepted Answer

Misfolded proteins

Answer

RNA

Answer

DNA

Answer

Lipid membranes