객관식
Which of the following best explains why antibiotics are effective against bacteria but not human cells?
117
views
1. Introduction to Microbiology
Introduction to Bacteria
객관식
Which of the following best describes the structure assembled on top of the cytoplasmic membrane in Gram-positive bacteria?
A
A single phospholipid bilayer with embedded proteins
B
A thick layer of peptidoglycan containing teichoic acids
C
A thin layer of peptidoglycan surrounded by a capsule
D
An outer membrane containing lipopolysaccharides
검증된 단계별 안내1
Step 1: Understand the basic cell envelope structure of Gram-positive bacteria. Gram-positive bacteria have a cytoplasmic membrane and a thick cell wall but lack an outer membrane.
Step 2: Recall that the cytoplasmic membrane is a phospholipid bilayer with embedded proteins, common to all bacteria, but the question asks about the structure assembled on top of this membrane.
Step 3: Identify the main component of the cell wall in Gram-positive bacteria, which is a thick layer of peptidoglycan. This layer provides rigidity and shape to the cell.
Step 4: Recognize that teichoic acids are molecules embedded within the thick peptidoglycan layer in Gram-positive bacteria, playing roles in cell wall maintenance and ion regulation.
Step 5: Compare this to Gram-negative bacteria, which have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides, a structure absent in Gram-positive bacteria.
관련 영상
관련 실천
