Answer:
The study of the cell cycle focuses on mechanisms that regulate the timing and frequency of DNA duplication and cell division. As a biological concept, the cell cycle is defined as the period between successive divisions of a cell. During this period, the contents of the cell must be accurately replicated. Microscopists had known about cell division for more than one hundred years, but not until the 1950s, through the pioneering work of Alma Howard and Stephen Pelc, did they become aware that DNA replication took place only at a specific phase of the cell cycle and that this phase was clearly separated from mitosis. Howard and Pelc's work in the broad bean, Vicia faba, revealed that the cell goes through many discrete phases before and after cell division. From this understanding, scientists then identified the four characteristic phases of the cell cycle: mitosis (M), gap 1 (G1), DNA synthesis (S), and gap 2 (G2). The study of these phases, the proteins that regulate them, and the complex biochemical interactions that stop or start DNA replication and cell division (cytokinesis) are the primary concerns of cell cycle biologists.
The most significant progress in this research field came with the demonstration that specific protein complexes involving cyclins were critical for regulating the passage of cells through the cell cycle. These early observations came from biological studies of the cells of rapidly dividing fertilized frog eggs as well as mutant yeast cells that could not divide. The observations suggested that regulation of the cell cycle is conserved throughout eukaryotes, which has since proved to be the case. The mechanism of division in bacteria differs from that of eukaryotes, and the control of their cell cycle is also somewhat different, although again it is linked with DNA replication.
Although the cell cycle is a highly integrated process, distinct areas of interest within this field of study have emerged. For instance, many genes and proteins that influence the passage from one phase of the cell cycle to another have been identified. When their expression is altered by mutation or aberrant regulation, they are usually classed as oncogenes. Other proteins act to hold the cell at distinct points in the cycle (checkpoints) and are known as tumor suppressor genes. Apart from those with a clearly regulatory role, many proteins have important functions in other aspects of the cell cycle; one is replication of DNA and organelles, which is a fascinating process that includes its own repair mechanisms and self-editing. Other fields focus primarily on the mechanical processes of cell cleavage into two daughter cells at the end of mitosis and on the condensation and decondensation of chromatin.
Explanation:
The astronomical debris was pulled into an orbit around the star.
The answer is, "were". I hope this helps.
Answer:
Yes, "An Occurrence at Owl Creek Bridge" is an example of realism, even though Bierce employs romantic techniques in the story.
Explanation:
<u>Romanticism had among its characteristics the glorification of war and heroism. At first, that seems to be what Ambrose Bierce will do in his short story "An Occurrence at Owl Creek Bridge".</u> The main character, Peyton Farquhar, is tricked into trying to burn a bridge that would allow Union soldiers to cross. Farquhar is a Confederacy supporter. He ends up being caught as a traitor and, when he is about to be hanged, he escapes. So far, Romanticism has prevailed.
<u>However, Bierce is only deceiving readers.</u> We are led to believe Farquhar has escaped, that the noose broke, and he found himself swimming in the creek, dodging bullets, free to return home. <u>We are soon disappointed</u>, however, as it is revealed that it was all his imagination - or even a hallucination - in the brief moments it took Farquhar to die. <u>The ending of the story is based on Realism. Far from being romanticized, it describes how horrid and gruesome death and war are, and how heroism is not always rewarded:</u>
<u><em>Peyton Farquhar was dead; his body, with a broken neck, swung gently from side to side beneath the timbers of the Owl Creek bridge.</em></u>
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Answer:
you too:)
Explanation:
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