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Type d'organisation des glandes endocrines au sein des épithéliums de revêtement
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- The spike proteins of enveloped viruses, such as influenza HA, share which structural feature with fibrous proteins?a) a Gly-Ala/Ser repeat that leads to a collagen-like triple helixb) a heptad repeat of hydrophobic amino acids that leads to a collagen-like triple helixc) viral spike proteins share no structural features with fibrous proteinsd) a heptad repeat of hydrophobic amino acids that leads to a three-stranded, coiled-coil structuree) a Gly-Pro-HydroxyPro repeat that leads to a collagen-like triple helix
- The image below shows a segment of the surface of Jupiter's moon Callisto. Why are portions of the surface dark? Why are some craters dark and some white? What does this image tell you about the history of Callisto?a. Callisto is a mixture of rock and ice; dark surfaces are rocky and ice-free. Dark craters formed after meteorite impacts and white craters are vents of icy volcanoes. The surface of Callisto is rather old.b. The surface has been modified by the sunlight; also dust particles have accumulated on it. Dark craters are old, while white craters are young and expose fresh white ice. The surface of Callisto is rather old.c. Callisto is a mixture of rock and ice; dark surfaces are rocky and ice-free. Dark craters are old, while white craters are young and expose fresh white ice. Callisto has been geologically active.d. The surface has been modified by sunlight; also dust particles have accumulated on it. Dark craters formed after meteorite impacts and white craters are vents of active volcanoes. Callisto has been geologically active.
- Dos cosas fueron fundamentales en este cambio: la popularización del aire acondicionado y la llegada del Fidel Castro al poder en Cuba en 1959.