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【多选题】
Why can DNA replace RNA as a more stable molecule for storing genetic information?A.
The deoxyribose in its sugar–phosphate backbone makes chains of DNA chemically much more stable than chains of RNA, so that DNA can grow to greater lengths without breakage.
B.
The other differences between RNA and DNA—the double-helical structure of DNA and the use of thymine rather than uracil—further enhance DNA stability by making the molecule easier to repair.
C.
A damaged nucleotide on one strand of the double helix can be repaired by using the other strand as a template. Furthermore, deamination, one of the most common detrimental chemical changes occurring in polynucleotides, is easier to detect and repair in DNA than in RN
D.
This is because the product of the deamination of cytosine is, by chance, uracil, which already exists in RNA, so that such damage would be impossible for repair enzymes to detect in an RNA molecule. However, in DNA, which has thymine rather than uracil, any uracil produced by the accidental deamination of cytosine is easily detected and repaired.
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【多选题】关于缓冲区溢出攻击,正确的描述是?
A.
缓冲区溢出攻击手段一般分为本地攻击和远程攻击。
B.
缓冲区溢出是一种系统攻击的手段，通过向程序的缓冲区写超出其长度的内容，造成缓冲区的溢出，从而破坏程序的堆栈，使程序转而执行其它指令，以达到攻击的目的。
C.
缓冲区溢出攻击之所以成为一种常见安全攻击手段其原因在于缓冲区溢出漏洞太普遍了，并且易于实现。
D.
缓冲区溢出攻击的目的在于扰乱具有某些特权运行的程序的功能，这样可以使得攻击者取得root权限，那么整个主机就被控制了。
【单选题】关于氏杆菌病所致肝脏病变的病理，下列说法错误的是（）
A.
病变是布氏杆菌及其毒素和变态反应不同程度起作用的结果
B.
该病变是布氏杆菌病的急性期表现
C.
该病变是单核吞噬细胞系统受累所致
D.
是由上皮样细胞、巨细胞、浆细胞、淋巴细胞等组成的肉芽肿
E.
布氏杆菌可以寄生于内，在一定情况下大量繁殖，再次冲破寄生细胞，引起复发
【简答题】档案的萌芽有()、()、()。
【简答题】求一个3*3矩阵对角线元素之和. 1 2 3 4 5 6 7 8 9
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