p{font-size:10.5pt;line-height:150%;margin:0;padding:0;}td{font-size:10.5pt;}(08唐山市二调)卡尔文用同位素标记法追踪碳素在光合作用过程中的运行:在供给小球藻14CO2后的60s内,相隔不同时间取样,杀死细胞并以层析法分析细胞代谢产物。发现7s后的代谢产物中有多达12种产物含有放射性,而5s内的代谢产物大多集中在一种物质上,该物质是 A.C5 B.C3 C.C4 D.葡萄糖He is a stranger to me though we have met twice before.
[ ]A. primarily B. virtually C. reasonably D. impatiently