【名词&注释】
基因突变(gene mutation)、减数分裂(meiosis)、单倍体(haploid)、体细胞(somatic)、雄配子体(male gametophyte)、裸子植物(gymnosperm)、卵细胞(egg cell)、红豆杉纲(taxopsida)
[单选题]现代裸子植物(gymnosperm)中最原始的类群是( )。
A. 银杏纲
B. 铁树纲
C. 红豆杉纲(taxopsida)
D. 松柏纲
查看答案&解析
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举一反三：
[单选题]裸子植物(gymnosperm)的雄配子体只有一个精子，所以不能进行双受精。( )
A. 正确
B. 错误
[单选题]珠心、珠被和珠柄愈合的部位，称合点。( )
A. 正确
B. 错误
[多选题]下列关于变异的说法正确的是：
A. 单倍体的体细胞中可以含有多个染色体组
B. 基因重组出现在减数分裂第一次分裂过程中
C. 基因突变可产生新的基因
D. 非同源染色体之间交换片段属于染色体变异
[单选题]Helping others is a habit, _______ you can learn even at an early age.
A. it
B. that
C. what
D. one
[单选题]两轮花被色泽、形状等方面并无区分，称为( )，如百合的花。
A. 两被花
B. 单被花
C. 同被花
D. 重被花
[单选题]What does the writer dislike most about dinner parties in New Yorkers
A. There is a strange mix of people.
B. The restaurants are expensive.
C. The bill is not fairly shared.
D. People have to pay cash
[单选题]A good agent can help you ____.
A. know more people
B. find cheap accommodation
C. get the right accommodation quickly
D. get free information about most accommodations
[单选题]In the texc the authot expresses_____,
A. his concern for his mother’s health
B. his support for drinking Chinese green tea
C. hia surprise at China’s recent devclopment
D. his wonder at the growth of India’s IT industry
[单选题]What does the man mean?
A. He got there in only five minutes.
B. He has a good reason for being late.
C. He is used to waiting for the woman.
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