细胞核的主要组成部分是（）。
A.细胞膜
B.细胞质
C.染色体
D.以上都不对
参考答案：C
科学家用含3H标记的亮氨酸的培养液培养豚鼠的胰腺腺泡细胞，下表为在腺泡细胞几种结构中最早检测到放射性的时间表。下列叙述中正确的是
A．形成分泌蛋白的多肽最早在内质网上合成
B．高尔基体膜向内与内质网膜相连，向外与细胞膜相连
C．高尔基体具有转运分泌蛋白的作用
D．靠近细胞膜的囊泡可由核糖体形成
The nurse is working in a support group for clients with acquired immunodeficiency syndrome (AIDS). Which point is most important for the nurse to stress
A．Avoiding the use of illicit drugs and alcohol.
B．Refraining from telling anyone about the diagnosis.
C．Following safer-sex practices.
D．Telling potential sex partners about the diagnosis, as required by law.
