1.非选择题- (共1题)
(1)控制家兔毛色的两对基因位于__________对同源染色体上。
(2)将子二代的雌雄白兔随机交配,所得子代个体还是白色的比例为________________________________。
(3)现将绿色荧光蛋白基因(G)转入基因型为AABb雄兔的某条染色体上使之能够在紫外线下发绿色荧光。为了确定基因G所在的染色体,用多只纯种白色雌兔(aabb)与该雄兔测交,产生足够多后代(不考虑交叉互换)。
若产生的后代中仅雌性兔能够发荧光,则基因G最可能位于__________染色体上。
若基因G与基因B位于同一条染色体上,则后代的表现型及比例是______________________________。
若后代黑毛兔中能发荧光的个体所占比例为1/2,则G基因位于_____________________________染色体上。
2.单选题- (共10题)
A.在低温诱导某2N生物细胞染色体加倍实验中,观察到细胞中的染色体数可能有2N、4N或8N |
B.苏丹Ⅲ染色后的花生子叶细胞中可观察到橘黄色颗粒 |
C.在新鲜黑藻小叶装片中可进行叶绿体和线粒体形态的观察 |
D.转换物镜时应该手握转换器转动 |
A.用双缩脲试剂检测经蛋白酶处理后的样液中底物的有无 |
B.探究PH对酶活性的影响可用过氧化氢作底物 |
C.观察细胞中线粒体时,需将口腔上皮细胞经盐酸处理后再染色 |
D.将重铬酸钾直接加到酵母菌培养液中检测酒精的有无 |
A.999、1016、1016 | B.999、1、1 | C.996、24、54 | D.996、1016、1016 |
A.细胞骨架与细胞中能量转换等生命活动有关 |
B.核糖体是醋酸菌、噬菌体、木耳唯一共有的细胞器 |
C.小肠粘膜不属于生物膜系统 |
D.内质网参与一些物质的加工和运输,也参与一些物质的合成 |
A.75% | B.50% | C.42% | D.21% |

A.由H→I,DNA的含量增加一倍,是复制的结果 |
B.图中受精作用过程是HJ |
C.由R→P,DNA的含量减少一半,是着丝点分裂,姐妹染色单体分开,分别进入到两个子细胞中去的结果 |
D.CD和NR段染色体数相同 |
A.控制白花性状的基因是通过基因重组产生的 |
B.白花植株和黄花植株存在着生殖隔离 |
C.白花植株的自交子代开出黄花,则白花植株为杂合子 |
D.快速繁育白花品种,应取白花植株的种子进行繁殖 |
A.醋酸菌在无氧条件下利用乙醇产生醋酸 |
B.酵母菌在无氧条件下利用葡萄糖汁产生酒精 |
C.泡菜腌制利用了乳酸菌的乳酸发酵 |
D.腐乳制作利用了毛霉等微生物的蛋白酶和脂肪酶 |
A.该实验的自变量是菌种,温度属于无关变量 |
B.大豆发酵过程中部分蛋白质转变为多肽,形成豆豉的独特风味 |
C.若容器内上层大豆发酵效果优于底层,则发酵菌为厌氧菌 |
D.煮熟大豆使蛋白质变性,有利于菌体分泌酶作用于蛋白质 |
3.选择题- (共1题)
How to Become an Activist (活动家)
Activists are people who see the need for change and devote their time to doing something about it.{#blank#}1{#/blank#}If you are interested in it you can do so.
{#blank#}2{#/blank#}This could be anything from a student club to a national organization (like the American Civil Liberties Union or the National Organizers Alliance). Most activist organizations offer different levels of involvement, so you can do whatever you feel most comfortable with, whether that means attending meetings and demonstrations or just donating a little money when you can.
Volunteer your time. One of the best ways to make a difference is to volunteer your time. Reach out to organizations in your community that do work for your cause, and ask how you can help.
Donate money or supplies.{#blank#}3{#/blank#}If you can't afford to donate money to an organization that supports your cause, you may be able to donate other things they need, like clothing or canned food.
Reach out to family and friends. Tell your family and friends about your cause, and invite them to get involved. If they are interested, share literature about your cause or just talk to them about what you have learned.{#blank#}4{#/blank#}
Promote your cause on social media. You can use social media to help keep your friends and followers informed about the causes you support.{#blank#}5{#/blank#}Also, you can invite your friends to attend events or donate to fundraisers for your cause.
A. Take classes on issues related to your cause.
B. Join an organization that supports your cause.
C. They are driven by passion and a vision for a better future.
D. If you do volunteer work, invite them to volunteer with you.
E. Most activists or charitable organizations need resources to do their work.
F. Post useful articles and write about what you are doing to stay involved.
G. If you can't reach out to them in person, then try connecting to people online.
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【1】题量占比
非选择题:(1道)
单选题:(10道)
选择题:(1道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:2
5星难题:0
6星难题:7
7星难题:0
8星难题:0
9星难题:2