DNA is double stranded, and RNA is single stranded! Why is this statement wrong? Explain!

Mistake. The mistake is in all words.

Let me give you two examples:

1. SEN virus (SEN-V) is a new DNA virus found in the serum of HIV-infected intravenous drug users. SEN virus is a "single-stranded DNA" virus with about 3,800 nucleotides.

2. Reovirus, Olbivirus, and grape leaf roll virus are "double-stranded RNA" viruses.

Both sentences are wrong.

DNA doesn't have to be double-stranded: Some DNA viruses use single-stranded DNA as their genetic material.

RNA is not necessarily single-stranded: Some RNA viruses use double-stranded RNA as their genetic material.

DNA is double-stranded, RNA is single-stranded" is too absolute, biodiversity is very strong, especially the simplest structure of the virus, genetic material in various forms.

There are circular single-stranded and linear single-stranded DNA, as well as three-stranded DNA, which is found in some viruses; Most RNAs are single-stranded, but can form local double helixes (secondary structures) by folding themselves.

Some DNA is single-stranded and is generally found in prokaryotes, such as E. coli bacteriophage X174, G4, M13, etc. RNA is generally a single-stranded filamentous molecule; There are also double-stranded RNAs such as reovirus; circular single-stranded RNA such as virus-like RNA; Branched RNA molecules were also discovered in 1983.

DNA is both double-stranded, and RNA is mostly single-stranded. For example, some segments of the transferred RNA are double-stranded.

An RNA molecule that contains only one strand. The vast majority of RNA in living organisms is single-stranded RNA, and when forming a secondary structure, it is an RNA molecule with both single-stranded and double-stranded domains. Only some RNA viruses are double-stranded RNAs that are formed by two complementary strands

DNA is a long-chain polymer with a unit called a deoxynucleotide, while sugars are linked to phosphate molecules by ester bonds to form their long-chain backbone. Each sugar molecule is connected to one of the four bases, which are arranged along the long DNA chain to form the genetic code, which is the basis for the synthesis of protein amino acid sequences. The process of reading a code, called transcription, is the process of copying a piece of nucleic acid molecule called RNA from one of the DNA double-strands.

Most RNAs have the information to synthesize proteins, while others have their own special functions, such as rRNA, snRNA, and sIRNA

DNA-DNA because it can form more than three hydrogen bonded C and G pairs. There are only two A and T pairs, and the more hydrogen bonds there are, the more stable they are.

I'm also very curious about this question, I checked it on the Internet, and there are some dry goods on Zhihu.

Single fromThermodynamicsAngle,dsrna>dsdna>hybrids

From biochemical stability (Stability in vivo), there are miRNA double-stranded histone-DNA double-stranded complexes (i.e., large chromosomal DNA) >viral RNA double-strandedDNA bare double strands and RNA bare double strands hybrids

Web Links.

1. Decomposition with alkali: what can be decomposed is RNA, what cannot be decomposed is DNA 2, decomposition with specific enzymes: such as RNase1 only decomposes RNA, DNASE1 only decomposes DNA

3. Hydrolysis with acid, followed by single nucleotide chromatography: RNA containing U, DNA 4 containing T, color reaction: RNA and lichenol form bright green compounds, and DNA and diphenylamine form blue compounds.

Check their extinction coefficient, small RNAs.

Answer]: There are mainly the following methods to read the code:

First, it can be hydrolyzed with a single nuclease. For example, RNase only hydrolyzes RNA but not DNA, and DNASE only hydrolyzes DNA but not RNA. Type.

Second, dilute alkali hydrolysis. RNA can be hydrolyzed, but DNA cannot be hydrolyzed.

Third, high liquid acid hydrolysis. After complete hydrolysis, single nucleotide analysis (chromatography and electrophoresis are acceptable), and those containing U are RNA, and those containing T are DNA.

Fourth, the detection is based on the characteristic reaction. The D-2-deoxyribose in DNA can coheat with acid and diphenylamine to produce blue-violet, while the D-ribose from RNA can coheat with concentrated hydrochloric acid and moss melanol (methylresorcinol) to produce green.