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Y_Kistochka [10]
2 years ago
10

Over 90% of all parasympathetic fibers are derived from cranial nerves ________. v (trigeminal) vii (facial) x (vagus) xii (hypo

glossal)
Biology
1 answer:
Natasha2012 [34]2 years ago
8 0
Over 90% of all parasympathetic fibers are derived from the cranial nerve X, which is the vagus nerve. 
The vagus nerve influences most organs below the neck. The activation of this nerve affects heart rate, blood pressure, production of stomach acid, movement of food through the intestines and breathing. 
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strojnjashka [21]
The nitrogen fixation is a very important process because it is the principal source of nitrogen in the marine environment for photosynthetic plants. Nitrogen is a growth limiting nutrient, that is very important for the growth of photosynthetic plants. During the process of nitrogen fixation, nitrogen is absorbed from the atmosphere and it is fixed by nitrogen fixing organisms. 
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2 years ago
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A point mutation changes the DNA sequence CGA to CGT, but the same protein is still produced. Which point mutation occurred? A.
iren [92.7K]
The answer is <span>C.silent.

Nonsense, missense, silent, and frameshift mutations are point mutations. The point mutations are the change in a single nucleotide base on the DNA molecule. In a missense mutation, the change in a single nucleotide base results in a codon coding for a different amino acid. In a nonsense mutation, the change in a single nucleotide results in a stop codon or in a nonsense codon. Frameshift mutation, due to addition or deletion of a base, results in the change of reading frame and totally different translation. In all these cases, the change could lead to different of nonfunctional protein translation.
Silent mutation, on the other, means that change in a nucleotide base will no affect amino acid. It will result in a different codon, but the one that code for the same amino acid, so the same protein will be produced.

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7 0
2 years ago
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An ameba is a single-celled organism. It uses its cell membrane to obtain food from its environment, digests the food with the h
makvit [3.9K]

Answer:

According to me answer no 4  is correct.

Explanation:

single cell amoebas can perform all life functions capture the food, digestion, respiration, excretion, and reproduction also. These all are similar to multicellular animals.

3 0
2 years ago
What cellular process(es) is/are responsible for the increase in protein content associated with the gap phases of the cell cycl
Dafna11 [192]

Answer:

Protein/enzyme synthesis

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<em>The process of synthesis of protein in the cell is mainly responsible for the increase in the protein content of the cell.</em>

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During protein synthesis, mRNA synthesized in the nucleus are transported to the cytoplasm and the genetic codes on the mRNA are translated into their respective amino acids linked together by polypeptide bonds. The protein are then folded in specific ways for specific enzymes.

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As successional changes occur in an ecosystem, new species take advantage of new conditions. where do these new species come fro
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