A gram positive organisms contain a thin peptidoglycan layer
True
False
The Correct Answer is B
Gram-positive organisms are characterized by a thick peptidoglycan layer in their cell wall, which can be up to 20–80 nanometers thick. This dense layer provides structural support, maintains cell shape, and protects against osmotic pressure. It also retains the crystal violet-iodine complex during Gram staining, which is why gram-positive bacteria appear purple under a microscope. In contrast, gram-negative bacteria have a thin peptidoglycan layer located between the inner cytoplasmic membrane and the outer membrane, which does not retain the crystal violet stain. The thickness of the peptidoglycan layer is a key distinguishing feature between gram-positive and gram-negative bacteria.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. genus: In the binomial nomenclature system, the genus is the first part of the organism’s scientific name. For Staphylococcus aureus, “Staphylococcus” represents the genus, grouping bacteria with similar morphological and genetic characteristics, such as forming clusters of cocci.
B. domain name: The domain is the highest taxonomic rank and classifies life into broad categories such as Bacteria, Archaea, or Eukarya. It is not indicated in the binomial name and is separate from the genus and species designations.
C. species: The species is the second part of the binomial name, in this case, “aureus.” It identifies the specific organism within the genus, distinguishing it from other Staphylococcusspecies. The species name often reflects a characteristic trait, such as the golden color of colonies in S. aureus.
D. kingdom: Kingdom is a high-level taxonomic category below domain. In bacterial classification, the kingdom would be Bacteria, but it is not represented in the binomial name.
E. family name: Family is an intermediate taxonomic rank above genus and below order. For Staphylococcus aureus, the family is Staphylococcaceae, which groups related genera. The family name is not part of the binomial nomenclature.
Correct Answer is A
Explanation
Plasmids are small, circular, double-stranded DNA molecules that exist independently of the bacterial chromosome. They often carry genes that provide selective advantages, such as antibiotic resistance, virulence factors, or metabolic capabilities, allowing bacteria to adapt rapidly to environmental pressures. Plasmids can replicate autonomously and may be transferred between bacteria through processes like conjugation, promoting the spread of resistance or virulence traits. Unlike the chromosomal DNA, plasmids are not essential for basic survival but play a critical role in bacterial evolution and pathogenicity.
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