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试题答案

本文从以下几个角度介绍。

    1、普洱市2017-2018学年下学期高二年级期末检测文综
    2、普洱市2024年初中学业水平考试线上研讨会
    3、普洱市2024年高考情况
    4、普洱市2024年小学阶段质量抽测模拟卷
    5、2024云南普洱高中统测
    6、普洱二中2024年高考
    7、普洱市2024年初中八年级学年期末检测
    8、2024年云南省普洱市中考试卷
    9、2024年普洱高考时间
    10、普洱二中2024高考情况

4、普洱市2024~2025学年下学期期末统测试卷高二(7月)政治试题


3、普洱市2024~2025学年下学期期末统测试卷高二(7月)生物试题


【解析】【听力原文】1. meat 2. get up 3. tomato 4. like 5. favorite
【点评】考查听力题。听前快速浏览所给单词和短语，听时注意力集中抓取关键词。
2．A肉，B洋葱，C连衣裙，听力原文：肉，与选项A相匹配，故答案为A。
3．A起床，B去上学，C回家，听力原文：起床，与选项A相匹配，故答案为A。
4．A裤子，B西红柿（单数），C西红柿（复数）， 听力原文：西红柿（单数），与选项B相匹配，故答案为B。
5．A好的，B米饭，C喜欢，听力原文：喜欢，与选项C相匹配，故答案为C。
6．A水果，B最喜欢的，C派对，听力原文：最喜欢的，与选项B相匹配，故答案为B。


D
Artemisinin, a transformative compound derived from the sweet wormwood plant,has revolutionized the treatment of malaria.Discovered by Chinese scientist Tu Youyou in the 1970s, artemisinin is a sesquiterpene lactone containing a unique endoperoxide(内过氧化的) bridge,which is crucial for its antimalarial activity.Unlike traditional antimalarial drugs that rely onthermal energy to disrupt parasite function,artemisinin harnesses the power of its endoperoxide bridge to generate reactive oxygen species that destroy the malaria parasite.
The discovery of artemisinin was inspired by traditional Chinese medicine,where sweet wormwood (Artemisia annua) had been used for centuries to treat fever.Through a combination of solvent extraction and chromatography(色谱法),Tu Youyou and her team successfully isolated artemisinin,marking a significant breakthrough in the fight against malaria.The compound's molecular structure,which includes asesquiterpene skeleton(倍半萜骨架)and an endoperoxide group,was confirmed through spectroscopic(光谱) analysis and X-ray crystallography.
One of the most remarkable aspects of artemisinin is its mechanism of action.When activated byheme(血红素),a byproduct of hemoglobin digestion in malaria parasites, artemisinin generates free radicals that attack and damage the parasite's cellular structures.This targeted attack disrupts the parasite's membrane and enzyme systems,ultimately leading to its death.The endoperoxide bridge is essential for this process,as altering this structural feature eliminates artemisinin's antimalarial activity.
The synthesis of artemisinin has been a significant challenge due to its complex molecular structure.Traditional methods involve semi-synthesis,where artemisinic acid,extracted from sweet wormwood,is chemically converted into artemisinin. Recent advances insynthetic biology(合成生物学)have enabled the production of artemisinic acid in engineered yeast,significantly reducing production costs and increasing availability.This breakthrough,pioneered by Professor Jay Keasling's team,has made artemisinin-based therapies more accessible to patients in malaria-endemic regions.
Artemisinin's impact extends beyond malaria treatment.Research has shown that it exhibits anticancer properties,particularly against certain types of cancer cells.The compound's ability to generate reactive oxygen species makes it effective in damaging cancer cell membranes and inhibiting tumor growth.Additionally, artemisinin derivatives are being explored for their potential in treating autoimmune diseases such assystemic lupus erythematosus(系统性红斑狼疮),offering new avenues for therapeutic development.
Despite its remarkable success,challenges remain in the large-scale application of artemisinin.The emergence of drug-resistant malaria strains threatens the long-term effectiveness of artemisinin-based therapies.Ongoing research focuses on developing new derivatives and combination therapies to overcome resistance and ensure the continued efficacy of this life-saving compound.


4、普洱市2024~2025学年下学期期末统测试卷高二(7月)历史试题


3、普洱市2024~2025学年下学期期末统测试卷高二(7月)历史试题


5、普洱市2024~2025学年下学期期末统测高二(7月)英语试题


6、普洱市2024~2025学年下学期期末统测试卷高二(7月)生物学试题


4、普洱市2024~2025学年下学期期末统测试卷高二(7月)英语试题


4、普洱市2024~2025学年下学期期末统测试卷高二(7月)生物试题


A．沉淀呈絮状 B．沉淀的颗粒较大 C．沉淀容易沉降
(3)步骤Ⅱ中过滤使用到的玻璃仪器有 ，烧杯中发生反应的化学方程式为 。
(4)步骤Ⅲ制取硫酸亚铁铵晶体的反应中硫酸需过量，保持溶液的pH在1～2，其目的是 ；制得的晶体需要用 洗涤。
A．蒸馏水 B．饱和食盐水 C．无水乙醇
(5)步骤Ⅳ中：
①“滴定分析”步骤中，下列操作错误的是 。
A．用量筒量取25.00mL硫酸亚铁铵溶液


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3、普洱市2024~2025学年下学期期末统测试卷高二(7月)化学答案