前房出血且伴有眼压升高治疗宜

生活史(life cycle)

什么叫DNA的黏性末端(cohesive end或sticky end)？它对λ噬菌体完成生活史(life cycle)起什么作用？在遗传工程上有什么用处？

A.The project life cycle typically changes and evolves with the project.

B.The project management life cycle is unique to every project.

C.The project life cycle is can be referred to as the Project Management Life Cycle.

D.The product life cycle typically involves more than one project life cycle.

A．具有直接型生活史的寄生虫都是成虫感染人

B．具有间接型生活史的寄生虫都是虫卵感染人

C．具有直接型生活史的寄生虫都是幼虫感染人

D．具有直接型生活史的寄生虫在完成生活史过程中不需要中间宿主

A．a predictive life cycle

B．an incremental life cycle

C．a development life cycle

D．an iterative life cycle

A．寄生虫从虫卵开始，进行生长、发育到成虫的过程称为寄生虫的生活史

B．直接型寄生虫完成生活史必须要储存宿主的参与

C．间接型寄生虫完成生活史必须要中间宿主的参与

D．寄生虫生活史越简单，存活的机会越小

A、Direct life cycle

B、Indirect life cycle

C、has one intermediate host

D、no intermedate host

A、A parasite must be parasitized in the special part of the host in its whole life cycle

B、A parasite that must parasitize in host or otherwise survive throughout its life cycle

C、At least one life cycle period must lead a parasitic life

D、A parasite always needs special hosts throughout life cycle