During bacterial conjugation, DNA is transferred through a:
Pilus
Capsule
Flagellum
The Correct Answer is A
A. Pilus: During bacterial conjugation, a specialized structure called a sex pilus (or conjugation pilus) forms a direct connection between two bacterial cells. The donor cell transfers a copy of plasmid DNA or other genetic material through this pilus to the recipient cell, allowing for horizontal gene transfer and the spread of traits such as antibiotic resistance.
B. Capsule: The bacterial capsule is a polysaccharide layer that surrounds the cell wall and provides protection against phagocytosis and desiccation. It does not play a role in the transfer of DNA between bacterial cells, and therefore is not involved in conjugation.
C. Flagellum: The flagellum is a whip-like appendage that enables bacterial motility. While important for movement and chemotaxis, it is not used for DNA transfer during conjugation. DNA exchange occurs specifically through the pilus, not through flagella.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Coccus: A coccus is a spherical or round-shaped bacterium. Cocci can exist singly, in pairs (diplococci), chains (streptococci), clusters (staphylococci), or other arrangements depending on their pattern of division. The shape is an important morphological characteristic used in bacterial identification and classification in clinical microbiology.
B. Bacillus: A bacillus refers to a rod-shaped bacterium. Bacilli can occur singly or in chains and may be aerobic or anaerobic. Their elongated shape distinguishes them from cocci and influences how they move, attach to surfaces, and form spores.
C. Vibrio: A vibrio is a comma-shaped or curved rod-shaped bacterium. Vibrio species, such as Vibrio cholerae, are typically associated with aquatic environments and have distinct motility patterns. Their curved morphology differentiates them from cocci and bacilli.
Correct Answer is B
Explanation
A. Protozoa: Protozoa are single-celled eukaryotic organisms. They have a true nucleus and membrane-bound organelles, distinguishing them from prokaryotes. Examples include Plasmodium and Giardia.
B. Bacteria: Bacteria are prokaryotic organisms, meaning they lack a membrane-bound nucleus and organelles. Their genetic material exists in a nucleoid, and their cellular processes occur in the cytoplasm or at the plasma membrane. This simplicity allows rapid growth and adaptation.
C. Fungi: Fungi are eukaryotic organisms, including yeasts and molds. They possess a true nucleus, 80S ribosomes, and membrane-bound organelles. Their complex cellular structures differentiate them from prokaryotes.
D. Algae: Algae are eukaryotic photosynthetic organisms. They contain chloroplasts, a nucleus, and other organelles. While some are unicellular, their cellular organization classifies them as eukaryotic, not prokaryotic.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.