
Introduction: A cell is the fundamental unit of life. All living organisms are made up of one or many cells. The organisms are classified as prokaryotes and eukaryotes.

Answer to Problem 1CRQ
Correct answer: Option b) “Cells combine to form tissues.”
Explanation of Solution
Reason for the correct answer:
Option b) is given as “Cells combine to form tissues”.
The cell theory states that a cell is the basic structural unit among living organisms and cells arise from pre-existing cells. This theory has three principles as follows:
- A cell is the smallest unit of structure and functions in living organisms.
- All living beings are made up of one or more number of cells. Basically, cells are the building blocks of all animals and plants.
- New cells are formed from pre-existing cells and pass the genetic material to the offspring.
Similar types of cells combines to form tissues, but it is not the characteristic of the cell theory because not all organisms are multicellular and have the tissue level organization.
Hence, option b) is correct.
Reasons for incorrect answers:
Option a) is given as “Cells are the building blocks of life”. It is one of the characteristics of the cell theory. Hence, option a) is incorrect.
Option c) is given as “All new cells come from the division of pre-existing cells”. It is one of the characteristics of the cell theory. Hence, option c) is incorrect.
Option d) is given as “Cells are the smallest units that perform all vital physiological functions”. It is one of the characteristics of the cell theory. Hence, option d) is incorrect.
Therefore, options a), c), and d) are incorrect.
Cells combine to form tissues is not a characteristic of the cell theory.
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