Discover how ATP is produced for muscle contraction, the role of insulin and glucagon in glucose regulation, and the different types of muscle fibers.
Extract
[...] Conjugation : Direct transfer of DNA between two bacteria via a conjugation bridge. This DNA can be a plasmid, a small, independent, circular molecule from the bacterial chromosome, contributing to cytoplasmic heredity. THGs allow for rapid evolution of bacteria, particularly by conferring antibiotic resistance. They are exploited in biotechnology to create genetically modified organisms (GMOs) by transgenesis and produce molecules of interest. Horizontal gene transfers, drivers of evolution HGTs are not limited to bacteria and are also present in other groups of organisms, including animals. [...]
[...] FICHE 5 The Time and the Rocks - The appearance and disappearance of fossil groups allow for the establishment of breaks in the strata, and therefore in the geological history of the Earth. Based on these paleontological criteria, local stratigraphic reconstructions have gradually been linked to the global scale. This has allowed geologists to build a stratigraphic scale. Within this scale, time is divided into eras, containing several periods, which are themselves subdivided into stages. 'Each stage is defined by its paleontological content, calibrated through a reference outcrop: the stratotype.' - Absolute dating uses the radioactive properties of isotopes contained in the objects to be dated. [...]
[...] The study of protein sequences and the construction of phylogenetic trees show evidence of these transfers. Genes inherited from phylogenetically distant organisms can introduce new advantageous traits, such as syncytin in primates, derived from viruses, facilitating the development of the placenta. These transferred genes confer a selective advantage, improving the survival or reproduction of the recipient organism. They thus increase the frequency of integrated genetic sequences in populations. Endosymbiosis Symbiosis is a durable association with reciprocal benefits between two organisms, and endosymbiosis refers to a situation where an organism lives inside the cells of another. [...]
[...] We can therefore obtain several ages for the same rock, which are not interpreted in the same way. In general, we cannot use the radioactive decay law for two reasons: the initial quantity of the parent element in the sample is not known and that of the daughter element was perhaps not zero at the time of the system's closure. 'The choice of the radio-chronometer depends on the age assumed of the object to be dated, which can be approached by relative dating.' - Concerning the radio-chronometer Rb/Sr, whose 87Rb is the parent isotope and 87Sr is the daughter isotope, several measurements are made of the object to be dated, from which a regression line, called an 'isochrone', is drawn in the graph (87Sr/86Sr) = f(87Rb/86Sr). [...]
[...] Training can modify the proportion of type I and II muscle fibers. - Doping : The use of exogenous substances such as anabolic steroids to increase muscle mass or stimulate metabolism can have harmful effects on health, including muscle injuries, cancers, cardiovascular diseases and infertility. FICHE 4 Glucose flux regulation Constat - The contraction of muscle cells requires a lot of energy obtained by oxidation of nutrients through aerobic or anaerobic metabolic pathways. Glucose is one of these essential nutrients. [...]
