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Biology · CELL THE UNIT OF LIFE

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Which of the following statements about the bacterial cell envelope is correct?

  1. The cell envelope consists of two loosely bound layers that function independently without protection
  2. Gram-negative bacteria retain the crystal violet stain due to a thick outermost peptidoglycan coat
  3. The plasma membrane is structurally completely different from eukaryotic plasma membrane
  4. A thick and tough glycocalyx is called capsule, whereas a loose sheath form is called slime layer

Correct answer · Option 4

A thick and tough glycocalyx is called capsule, whereas a loose sheath form is called slime layer

Explanation

Glycocalyx varies in thickness: a loose sheath is a slime layer, while a thick and tough layer is termed a capsule.

Related questions

In a diploid human somatic cell, approximately two metres of DNA is packaged within the nucleus into 46 chromosomes. What is the fundamental biochemical composition of interphase chromatin?→In plant cells, the tonoplast plays a crucial physiological role by facilitating the transport of a number of ions and other materials. What is the direction and nature of this transport relative to concentration gradients?→Given below are two statements:\n Statement I: The ribosomes of chloroplasts are 70S, which are smaller than the cytoplasmic 80S ribosomes of eukaryotic cells.\n Statement II: The inner membrane of the chloroplast is comparatively more permeable to solutes than its outer membrane. \nIn the light of the above statements, choose the most appropriate answer from the options given below:→Consider the following statements regarding the formulation of cell theory: (A) Matthias Schleiden concluded that the presence of cell wall is a unique character of plant cells. (B) Theodore Schwann studied different types of animal cells and observed a thin outer layer known as plasma membrane. (C) Schleiden and Schwann together formulated the cell theory but could not explain how new cells were formed. Which of the above statements are correct?→
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