题目：
蛋白质在等电点时的特征是（）
A.分子静电荷是零
B.分子带的电荷较多
C.溶解度升高
D.不易沉淀
E.在电场作用下定向移动
答案：
参考答案：A
解析：蛋白质的等电点是指在某一pH溶液中，蛋白质解离成正、负离子的趋势相等，即成为兼性离子，所带正、负电荷相等，静电荷为零。
蛋白质在等电点时的特征是（） A.分子静电荷是零 B.分子带的电荷较多 C.溶解度升
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