Functions of the bacterial cell membrane include
transport of nutrients in and out of the cell.
replicating DNA.
synthesizing proteins.
secretion of cell metabolites into the extracellular environment.
helping the cell maintain its shape.
Correct Answer : A,D
A. transport of nutrients in and out of the cell: The bacterial cell membrane is a selectively permeable phospholipid bilayer that regulates the movement of substances into and out of the cell. It contains transport proteins, channels, and carriers that facilitate passive diffusion, facilitated diffusion, and active transport of nutrients such as glucose, amino acids, and ions.
B. replicating DNA: DNA replication occurs primarily in the nucleoid region of the bacterial cytoplasm where the bacterial chromosome is located. Enzymes such as DNA polymerase and helicase carry out replication within this region. The cell membrane does not directly participate in DNA replication.
C. synthesizing proteins: Protein synthesis in bacteria occurs on ribosomes, specifically the 70S ribosomes located in the cytoplasm. These ribosomes translate messenger RNA into polypeptide chains during the process of translation. The cell membrane does not perform protein synthesis, although some proteins may later become embedded in or associated with the membrane.
D. secretion of cell metabolites into the extracellular environment: The bacterial cell membrane plays a major role in secretion processes. Specialized membrane transport systems and secretion pathways move metabolic byproducts, enzymes, toxins, and signaling molecules from the cytoplasm to the extracellular environment. This is important for nutrient acquisition, communication with other cells, and interactions with host tissues.
E. helping the cell maintain its shape: Maintenance of bacterial cell shape is primarily the function of the cell wall, which is composed largely of peptidoglycan. The rigid cell wall protects the bacterium from osmotic pressure and gives the cell its characteristic morphology. The cell membrane is flexible and does not provide the structural rigidity necessary to maintain shape.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is C
Explanation
A. endergonic: Endergonic reactions require an input of energy to proceed and result in products with higher free energy than the reactants. While some bond-breaking reactions may involve energy input, the hydrolysis of glycosidic bonds is generally exergonic, releasing energy rather than consuming it.
B. metabolic: The term metabolic is broad and refers to all chemical reactions occurring in an organism, including both catabolic and anabolic processes. While glycosidic bond breakage is part of metabolism, this term does not specifically describe the type of reaction.
C. catabolic: Catabolic reactions involve the breakdown of larger, complex molecules into smaller, simpler ones, typically releasing energy that can be used by the cell. Breaking glycosidic bonds in polysaccharides like starch or glycogen releases monosaccharides and energy, classifying this process as catabolic.
D. anabolic: Anabolic reactions are constructive processes in which small molecules are joined to form larger, complex molecules, usually requiring an input of energy. Forming glycosidic bonds to synthesize polysaccharides would be anabolic, but breaking them is the opposite process.
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.