TEXTBOOK OF DIAGNOSTIC
MICROBIOLOGY SIXTH EDITION CONNIE R
MAHON EXAM REVIEW VERIFIED
QUESTIONS WITH DETAILED ANSWERS
STUDY RESOURCE GRADED A+
⩥ Nucleoid.
Answer: - no nuclear membrane
- usually single (haploid)
- usually circular
- double stranded DNA
divided by binary fission
⩥ Plasmids.
Answer: - extrachromosomal genetic elements (will never find in the
nucleus)
- carry non-crucial genes
- can be used for transfer of anti-microbial resistance
reduce toxins
⩥ Ribosomes.
Answer: - Site of protein synthesis
, - 70S in prokaryotes
- 80S in eukarayotes
- main production is protein synthesis
- Eukaryotes: 80S total—Large = 60S Small- 40S, membrane- bound:
attached to endoplasmic reticulum
Prokaryotes: 70S total: Large= 50S small- 30S, in chloroplasts and
mitochondria
⩥ Cell Wall.
Answer: -Polymer of a repeating disaccharide in rows
-NAG and NAM
-Rows are linked by polypeptides
-Functions:
1.Shape the cell
2. Protect the cell from osmotic lysis
⩥ Plasma Membrane.
Answer: - Phospholipid bilayer (can be destroyed through alcohol or
soap)
- Peripheral proteins
- Integral proteins
- Transmembrane proteins
MICROBIOLOGY SIXTH EDITION CONNIE R
MAHON EXAM REVIEW VERIFIED
QUESTIONS WITH DETAILED ANSWERS
STUDY RESOURCE GRADED A+
⩥ Nucleoid.
Answer: - no nuclear membrane
- usually single (haploid)
- usually circular
- double stranded DNA
divided by binary fission
⩥ Plasmids.
Answer: - extrachromosomal genetic elements (will never find in the
nucleus)
- carry non-crucial genes
- can be used for transfer of anti-microbial resistance
reduce toxins
⩥ Ribosomes.
Answer: - Site of protein synthesis
, - 70S in prokaryotes
- 80S in eukarayotes
- main production is protein synthesis
- Eukaryotes: 80S total—Large = 60S Small- 40S, membrane- bound:
attached to endoplasmic reticulum
Prokaryotes: 70S total: Large= 50S small- 30S, in chloroplasts and
mitochondria
⩥ Cell Wall.
Answer: -Polymer of a repeating disaccharide in rows
-NAG and NAM
-Rows are linked by polypeptides
-Functions:
1.Shape the cell
2. Protect the cell from osmotic lysis
⩥ Plasma Membrane.
Answer: - Phospholipid bilayer (can be destroyed through alcohol or
soap)
- Peripheral proteins
- Integral proteins
- Transmembrane proteins