问题
问答题 简答题
为什么饲草中氮素营养价值的高低，常用蛋白质的生物学价值来表示？
答案
参考答案：
牧草中氮素营养价值的大小，不能简单的应用牧草中含氮物质的数量来表示，而要看牧草中的含氮物质在家畜体内吸收利用效率的高低。蛋白质的生物学价值就是氮素在家畜体内的利用率，某一牧草含氮量，高蛋白质的生物学价值高，才说明其营养价值高。
搜题请搜索小程序“爱下问搜题”
为什么饲草中氮素营养价值的高低，常用蛋白质的生物学价值来表示？
参考答案：
牧草中氮素营养价值的大小，不能简单的应用牧草中含氮物质的数量来表示，而要看牧草中的含氮物质在家畜体内吸收利用效率的高低。蛋白质的生物学价值就是氮素在家畜体内的利用率，某一牧草含氮量，高蛋白质的生物学价值高，才说明其营养价值高。
| It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too. The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte—literally, "fish killer." It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding. Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them. Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation. To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack. |
Which of the following statements is tree ______ .
A．Scientists have solved the mystery about the fish killer.
B．More studies need to be made about the fish killer.
C．It is proved that the algae are reducing fish populations.
D．Humans have already been affected by the toxin.