1. How does the bacterial cell wall differ from the cell membrane? a. Only the c
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Question
1. How does the bacterial cell wall differ from the cell membrane? a. Only the cell wall is composed of organic molecules. b. Only the cell membrane is impermeable to ions. c. Only the cell wall is external to the cytoplasm. d. Only the cell membrane is unique to bacteria. 2. Lipopolysaccharides are part of a. the inner membrane b the nucleus c. the cell membrane d. the outer membrane Most bacteria have a. multiple linear chromosomes in the nucleus 3. Hb. a single circular chromosome in the cytoplasrm c. a single circular chromosome in the nucleus. d. multiple linear chromosome in the cytoplasm. 4. Siderophores are used to obtain which nutrient from the environment? a. ATP b. glucose c. potassium d. ironExplanation / Answer
Answer:
1). b. Only the cell membrane is impermeable to ions
Explanation:
Cell wall is completely permeable to ordinary macromolecules. Cell membrane is selectively permeable or semi- permeable allowing only certain molecules to pass through.
2). d. The outer membrane
Explanation:
Lipopolysaccharide (LPS) is the major component of the outer membrane of Gram-negative bacteria.
3). b. A single circular chromosome in the cytoplasm
Explanation: Bacteria do not have linear chromsomes and nucleus. They have only one circular chromosome in the cytoplasm.
4). d. Iron
Explanation:
Siderophores (from the Greek: “iron carriers”) are defined as relatively low molecular weight, ferric ion specific chelating agents elaborated by bacteria and fungi growing under low iron stress. The role of these compounds is to scavenge iron from the environment
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