According to the cell theory, where do cells come from?
Question 1 options:
cells are formed from the semi-conservative replication of DNA
cells come from other cells and, on rare occasions, from the spontaneous action of inorganic enzymes
cells can only come from other, pre-existing cells
cells can only arise from the complex chemical environment found in organic solutions
The correct answer is: cells can only come from other, pre-existing cells.
Why are cells described as the "building blocks" of all living things?
Question 2 options:
A cell is the smallest part of a living thing that can function on its own.
A cell is the smallest part of the air living things need to breathe.
Cells are always stacked in rows, like bricks, to build the parts of living things.
They are found in everything living things need, including water and food.
The correct answer is: A cell is the smallest part of a living thing that can function on its own.
The prokaryotic nucleoid is not surrounded by a.....
Question 3 options:
plasmid
cytoplasm
membrane
flagella
The correct answer is: membrane.
Decide which cell is Eukaryotic and which one is Prokaryotic.
Question 4 options:
1.
Eukaryotic Cell
2.
Prokaryotic Cell
It seems that the options for the Eukaryotic and Prokaryotic cells are missing. Could you please provide the options for Question 4?
This type of organism has different cells that are specialized to perform different functions.
Question 5 options:
Unicellular Organism
Multicellular Organism
Both Unicellular and Multicellular Organisms
None of the above.
The correct answer is: Multicellular Organism.
According to the cell theory, cells can only come from other, pre-existing cells. To understand how this conclusion was reached, we need to look at the historical background.
The cell theory, first formulated in the mid-19th century, is one of the fundamental principles of biology. It states that all living organisms are made up of cells, and that cells are the basic unit of structure and function in living organisms.
The development of the cell theory was driven by the observations and experiments of various scientists such as Robert Hooke, Matthias Schleiden, Theodor Schwann, and Rudolf Virchow. They collectively contributed to the understanding that cells are the building blocks of life.
One key observation was made by Rudolf Virchow in 1855. He proposed that cells can only arise from pre-existing cells, rejecting the concept of spontaneous generation. This idea was based on his studies of cells and tissues under the microscope, as well as his examination of diseases and their cellular pathology.
To support the concept that cells can only come from pre-existing cells, scientists have conducted numerous experiments over the years. For example, Louis Pasteur's experiments in the 1860s conclusively demonstrated that microorganisms do not spontaneously generate, but rather arise from pre-existing microorganisms.
As a result, the understanding that cells can only come from other, pre-existing cells became a central tenet of the cell theory. This principle has been extensively tested and validated by numerous experiments and observations in the field of biology.
Therefore, based on the cell theory, the correct answer to your question is that cells can only come from other, pre-existing cells.