30 Questions
What is the most outstanding feature observed in eukaryotic cells?
True nucleus surrounded by a membrane
What is the major structural difference between prokaryotes and eukaryotes?
Presence of a true nucleus in eukaryotes
What is suspended in the portion of nuclear region in prokaryotic cells?
Nucleoid
What characterizes prokaryotic cells based on staining results?
Cell wall chemistry
What lacks a limiting membrane in bacterial cells?
Nucleoid
What forms the basis for classifying cells into eukaryotic and prokaryotic categories?
Presence of a true nucleus
What stains the DNA to visualize the nucleoid of a bacterial cell under a light microscope?
Feulgen staining
Which characteristic shape describes a comma-shaped bacterial cell?
Spiral
What is the average size of bacilli (rod-shaped bacteria)?
0.5-1.0 µm wide X 1.0-4.0 µm long
What are the two configurations of the glycocalyx layers beyond the bacterial cell wall?
Capsule and slime layer
Which bacterial structure prevents phagocytosis?
Glycocalyx capsule
What is the molecular weight of the single, continuous DNA molecule in the bacterial nucleoid?
$3 X 10^{9}$ Dalton
How are most bacteria measured?
$10^{-6}$ m (microns)
What is the average length of bacterial cells?
1-2 µm
What is the structure containing a single chromosome in a bacterial cell?
Nucleoid
What is used by bacteria to attach and allows capsules to prevent phagocytosis?
Extracellular polysaccharide from the glycocalyx layer
What is the main difference between eukaryotic and prokaryotic cells?
Presence of a true nucleus in eukaryotic cells and absence of a membrane-bound nucleus in prokaryotic cells
Which characteristic shapes describe the morphology of prokaryotic cells?
Shape and arrangement
What is the distinguishing feature of the bacterial nucleoid?
Lacks a limiting membrane
What is the major basis for classifying cells into eukaryotic and prokaryotic categories?
Presence or absence of a true nucleus
What characterizes prokaryotic cells based on staining results?
Based on staining result
What is suspended in the portion of nuclear region in prokaryotic cells?
Nucleoid
What is the approximate molecular weight of the single, continuous DNA molecule in the bacterial nucleoid?
3 X 10^9 Dalton
What is the length of the unfold nuclear DNA in bacterial cells compared to the average length of bacterial cells?
1 mm compared to 2 µm
What is the range in size of bacterial cells, measured in microns (µm)?
1.0-1.3 µm X 3-10 µm
What are the most common microscopic morphologies of bacteria?
Rod-shaped and comma-shaped
What are the three forms of spiral bacteria?
Curved, thick, and thin
What are the two configurations of glycocalyx layers beyond the cell wall in bacteria?
Capsule and slime layer
What allows bacterial cells to attach and prevents phagocytosis?
"Neatly organized" glycocalyx layer
What is the distinguishing feature of the bacterial nucleoid?
"Single chromosome" structure
Explore the history, scope, and major structural differences between prokaryotes and eukaryotes in microbiology. Learn about the development of microbiology, classification of microorganisms, and the distinguishing characteristics of prokaryotic and eukaryotic cells.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
