IB生物考什么 DNA知识点整理来啦-唯寻国际教育

IB生物考什么？这门课需要记忆的内容是很多的，这也是很多同学觉得越学越难的原因之一。如果不想在考前挑战极限，最好在不忙的时候把每个知识点学扎实了，本文就来整理第7章DNA知识点的相关概念，还附有题目练习哟。

IB生物考什么 DNA知识点整理来啦内容图片_1

IB生物考什么？

IBDP生物课程大纲核心主题涉及细胞生物学、分子生物学、遗传学、生态、进化和生物多样性、人类生理等生物知识，HL还需要学习核酸、新陈代谢，细胞呼吸和光合作用、植物生物学、遗传学与进化、动物生理学等知识内容，选修部分包含神经生物学和行为、生物技术和生物信息学、生态与保护、人类生理几大主题。

考试的题目类型包括但不限于选择题，填空题，作图题。复习的时候多背背PPT、过一遍教材、以及整理笔记还是非常有必要的。

当然，对于一些比较复杂的理论或者特定的biological process，建议大家都要用自己的语言完整、详细地表述一遍，能让你的“Long Questions”论述题写起来顺手不少。

IB生物考什么？DNA概念笔记整理

7.1 DNA structure and replication
U1 Nucleosomes help to supercoil the DNA
U2 DNA structure suggested a mechanism for DNA replication
U3 DNA polymerases can only add nucleotides to the 3' end of a primer
U4 DNA replication is continuous on the leading strand and discontinuous on the lagging strand
U5 DNA replication is carried out by a complex system of enzymes
U6 Some regions of DNA do not code for proteins but have other important functions.
A1
Rosalind Franklin's and Maurice Wilkins' investigation of DNA structure by X-ray diffraction
A2 Use of nucleotides containing dideoxyribonucleic acid to stop DNA replication in preparation of samples for base sequencing.
A3 Tandem repeats are used in DNA profiling
S1 Analysis of results of the Hershey and Chase experiment providing evidence that DNA is the genetic material.
S2 Utilization of molecular visualization software to analyse the association between protein and DNA within a nucleosome

【附相关题目练习】

想了解IB生物考什么，需要看笔记，但也不能只看笔记，下面我们再来实战一下——

Which statement best describes why DNA replication is referred to as “semi-conservative”?

a. At each replication, each DNA molecule retains one strand intact and synthesizes the other strand from new material.

b. After one round of replication, half of the DNA contains the original material and half is made up of new material.

c. After two rounds of replication, all of the DNA contains a mixture of original and new material.

d. Within each strand, the number of purines equals the number of pyrimidines.

e. During replication, one strand acts as “leading” and the other as “lagging.”

本题答案为A。

IB生物有的题目要求学员比较、讨论、解释、分析、区分两组数据并需要写5-10行的答案，是比较难直接用方法获得确定答案的，可谓是既考验学员理科思维，也考验表达能力了。如果想了解更多准备心得与流程细节，欢迎点击预约试听【唯寻IB同步培训班】——

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