The endosymbiotic theory stated
that the mitochondria of eukaryotic cells are actually prokaryotic bacteria
which were once engulfed by prehistoric eukaryotic cells as a result of
evolution.
Therefore to answer this
question, here are some characteristics:
1 Both mitochondria and prokaryotic cells contain their own
DNA.
2 Neither of the two have
true nuclei, but they do have a space in which their DNA is enclosed.
3 Mitochondria and prokaryotic cells have similar
transcriptional machinery, which means that they have the same process of
making RNA from DNA.
<span>4 Mitochondria
contain their own genome, and the formation of their genome in most organisms
is circular similar to prokaryotes.</span>
I don't know Spanish but I would like to answer it in Spanish !!
Debido al exceso de carbohidratos y lípidos, el nivel de colesterol aumenta y la presión arterial aumenta! Y debido a esto, muchas enfermedades pueden desarrollarse!
interphase, prophase, metaphase, anaphase and telophase.
Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
