皮皮学，免费搜题
登录
搜题
【单选题】
Which of the following statements about nucleic acid structure is wrong?A.
The covalent backbones of nucleic acids consist of alternating phosphate and pentose residues, and the nitrogenous bases may be regarded as side groups joined to the backbone at regular intervals.
B.
The hydroxyl groups of the sugar residues form hydrogen bonds with water.
C.
The backbones of both DNA and RNA are hydrophobic.
D.
The phosphate groups, with a p K a near 0, are completely ionized and negatively charged at pH 7, and the negative charges are generally neutralized by ionic interactions with positive charges on proteins, metal ions, and polyamines.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】船舶事故是指船舶（客船、货船、油气船等）在内河或海域由于相撞、触礁、操作不当、系统失控、气象影响等原因发生爆炸燃烧、搁浅翻沉等，造成人员伤亡和财产损失的灾害。下列哪项不是该种事故的特点？（）
A.
事故危害严重
B.
类型、结构复杂
C.
救援难度大
D.
次生灾害危害小
【简答题】钩体病的主要传播方式是（ ）传播。
参考解析：
知识点：
题目纠错 0
发布
