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Biology · CELL THE UNIT OF LIFE

हिन्दी

Examine the diagram showing comparison of eukaryotic cell with other organisms: Which organism shown in the diagram lacks a cell wall and has a size of about 0.1 µm?

Question diagram
  1. A
    Typical eukaryotic cell
  2. B
    Typical bacteria
  3. C
    Viruses
  4. D
    PPLO
View Answer & Solution

Correct answer · Option D

PPLO

Explanation

In Figure 8.2, PPLO has a size of about 0.1 µm and lacks a cell wall (belonging to mycoplasmas).

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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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