Although the vast majority of DNA<span> in most </span>eukaryotes<span> is found in the </span>nucleus<span>, some DNA is present within the </span>mitochondria<span> of animals, plants, and fungi and within the chloroplasts of plants. These organelles are the main cellular sites for ATP formation, during </span>oxidative phosphorylation<span> in mitochondria and </span>photosynthesis<span> in chloroplasts (Chapter 16). Many lines of evidence indicate that mitochondria and chloroplasts evolved from bacteria that were endocytosed into ancestral cells containing a eukaryotic nucleus, forming </span>endosymbionts.<span> Over evolutionary time, most of the bacte-rial genes encoding components of the present-day organelles were transferred to the nucleus. However, mitochondria and chloroplasts in today’s eukaryotes retain circular DNAs encoding proteins essential for organellar function as well as the ribosomal and transfer RNAs required for their </span>translation<span>. Thus eukaryotic cells have multiple genetic systems: a predominant nuclear system and secondary systems with their own DNA in the mitochondria and chloroplasts.</span>
Answer:
C erosion
Explanation:
its taking away part of the beach, and it happens slowly over time
We use Chargaff's rule.
[A] + [G] = [C] + [T]
[A] + [G] + [C] + [T] = 100%
A is Adenine, G is Guanine, C is cytosine, T is Thymine.
Adenine always pairs with Thymine.
Guanine always pairs with Cytosine
So if Thymine is 30% then Adenine is 30% → 60% total
Therefore 100% - 60% = 40%
40% is shared equally among Cytosine and Guanine
Therefore Cytosine will be 20% and Guanine 20%
Cytosine is 20%
