Choose the incorrect statement w.r.t. the main arena of cellular activities of a cell:
Important Questions on Cell: The Unit of Life
Identify the mismatched pair concerning different shapes of the cells:
|
|
Cells |
Shapes |
|
(i) |
Tracheids |
Elongated |
|
(ii) |
White blood cells |
Round and biconcave |
|
(iii) |
Nerve cells |
Branched and long |
|
(iv) |
Mesophyll cell |
Round and oval |
Match the following columns:
| Column I | Column II | |
| A | Mycoplasma | (i) Longest cell |
| B | Human RBC |
(ii) 7 in diameter |
| C | Nerve cells | (iii) 10 - 20 |
| D | A typical eukaryotic cell | (iv) 0.3 in length |
| (v) Largest isolated single cell |
Read the following statement about cell envelope of bacteria:
(I) It is tightly bound three-layered structure.
(II) The outermost glycocalyx, followed by a cell wall and then the cell membrane.
(III) Each layer has a distinct function, but they act as a single unit.
I. It is the extension of the plasma membrane into the cytoplasm.
II. These extensions are in the form of vesicles, tubules and lamellae.
III. It helps in cell wall formation, DNA replication and secretion processes.
The above features are attributed to bacterial
Consider the following statements about prokaryotic cells and state true (T) or false (F):
A. The organization of the prokaryotic cell is fundamentally similar even though prokaryotes exhibit a wide variety of shapes and functions.
B. The size of a typical bacterial cell is 1-2 m.
C. An organized nucleus is absent. Instead, a nucleoid is found.
D. In the bacterial cells, DNA is extensively looped and coiled with the help of basic histone proteins.
