UExcel Microbiology Test 1
Which of the structures below contains enzyme and antibiotic resistance genes?
Explanation:
Plasmids are DNA molecules that are present in bacteria and other microscopic creatures. Plasmids are physically distinct from chromosomal DNA and multiply in their own right.
Which of the following statements about endotoxins is false?
Explanation:
Endotoxins are lipopolysaccharides found in Gram-negative bacteria's cell walls that can cause inflammation and fever in higher organisms as an immunological response. Endotoxic reactions can cause anaphylactic shock and death in patients.
Which of the following bacteria is incorrectly matched to the proper isolation media?
The correct answer:
Neisseria gonorrhoeae – Pink colonies media
Which of the following structures is the most crucial in microbial cell attachment?
Explanation:
The glycocalyx, also known as the pericellular matrix, is a glycoprotein and glycolipid layer that protects bacteria, epithelial cells, and other cells' cell membranes. Martinez-Palomo identified the glycocalyx, a cell covering seen in animal cells, in 1970.
Which of the diseases and germs listed below are mismatched?
The correct answer:
Lyme disease – Yersinia pestis
Which of the following bacteria is not gram-negative?
Explanation:
Clostridium perfringens is an opportunistic bacterium that can cause gas gangrene, meningitis, appendicitis, respiratory and urinary tract infections, septicaemia, sudden infant death syndrome, and a variety of gastrointestinal problems in humans and animals.
Which of the following statements about Staphylococcus aureus is false?
Explanation:
Staphylococcus aureus is a Gram-positive, round-shaped bacterium that belongs to the Bacillota family. It is a common member of the body's microbiota, commonly found in the upper respiratory tract and on the skin.
Which of the bacteria below stains well?
Explanation:
E. coli is a bacteria found in the lower intestine of warm-blooded animals.
Which of the diseases and germs on this list are mismatched?
The correct answer :
Yersinia enterocolitica – Diptheria
