Louis Pasture determined that microbes only appeared in sterile broth if the broth was exposed to the air. He concluded that microbes were found in the air and contaminated the broth. Pasteur's findings contributed to which part of the cell theory? a. All animals are made of cells
b. All cells come from preexisting cells
c. The cell if the basic functional unit of living tings
d. Unicellular organisms inherit an exact copy of DNA from the parent cell

Louis Pasture's experiment shows that all cells come from preexisting cells.

The cell is the smallest unit of living organisms. All animals are made up of cells. It is the basic functional unit of living things. Louis Pasture was one of the earliest scientists who contributed to the cell theory.

By his experiments, we saw that the sterile broth which originally contained no microbes will contain microbes after exposure to air implying that the microorganisms came from air. Therefore, all cells come from preexisting cells.

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Louis Pasteur, by observing that the microbes were in the air and contaminated the broth helped determine that all the cells came from pre-existing cells (option b), one of the postulates of the cell theory.

Explanation:

Louis Pasteur's experiments, conducted around 1860, showed that unicellular organisms appeared in a culture broth only if it was exposed to the air, where other microorganisms were present, thus disproving the hypothesis of spontaneous generation.

On the other hand, in the broth that was not exposed to the air Pasteur did not observe microorganisms.

By rejecting the hypothesis of spontaneous generation through his experiment, Louis Pasteur reaffirmed the postulate of the cell theory that proposes that all cells come from preexisting cells.

The other options are not correct due to:

   a and c. All animals are made of cells and cell is the basic functional unit of living things are postulates of the cellular theory that were not demonstrated by Pasteur's experiment.

    d. Unicellular organisms inherit an exact copy of DNA from the parent cell is not a postulate of cell theory.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion