Nucleoplasmin is a nuclear protein. this protein was divided into two segments and linked to the same large cytoplasmic protein, generating two fusion proteins. after injecting these fusion proteins into a cell, one of the proteins was found in the nucleus and the other in the cytoplasm. which of the following conclusions can be drawn from these results? a) nucleoplasmin does not have a nuclear localization signal. b) one of the fusion proteins entered the nucleus by passive transport c) the cytoplasmic protein contains a nuclear localization signal. d) only one of the two fusion proteins possesses a nuclear localization signal. e) nucleoplasmin regulates its own destruction in a cell

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.