double ringed base found in DNA and RNA Determine whether the following base sequence occurs in DNA or RNA: AUGCUAA Determine whether the following base sequence occurs in DNA or RNA: GUCUCAA Determine whether the following base sequence occurs in DNA or RNA: TATTAGA Deter...
Guanine-rich DNA or RNA sequences can fold into higher-order, four-stranded structures termed quadruplexes that are suspected to play pivotal roles in cellular mechanisms including the control of the genome integrity and gene expression. However, the biological relevance of quadruplexes is still a ...
DNA and RNA are central to life. They are the molecules that carry genes, which are passed from parent to offspring and underpin heredity. Most organisms have genes made ofDNA, although some viruses use RNA. Many researchers investigatinghow life begansuspect that RNA came first...
(2)either, or.考查固定词组,根据文章第一段For viruses, some are sections of RNA, and the others are sections of DNA.可知:有些病毒含有RNA遗传物质,有些病毒含有DNA遗传物质,表示两种可能,要用词组either…or…不是……,就是……,故填:either, or.(3)independently.考查副词,根据文章第二段A ...
根据第1大段“For viruses, some are sections of RNA, and the others are sections of DNA.”对于病毒来说,有些是RNA片段,有些是DNA片段。可知,病毒要么是RNA片段,要么是DNA片段。要么……要么either…or。故答案填either。 (3)题详解: 细节理解题。根据第1大段“For viruses, some are sections of RNA...
1e), with essentially no differences in activity using either RNA or DNA as the initiating species in this coupled reaction kit. Figure 1 The AtYoeB toxin cleaves both RNA and DNA in vitro with the same concentration dependent efficiency. (a) AtYoeB possesses a sequence-independent RNase ...
Virus is a nucleoprotein entity which is able to utilize the synthetic machinery of a living cell of another organism for its multiplication which does not involve growth and division.The nucleic acid is either DNA or RNA but never both. DNA containing viruses are called deoxyviruses while RNA ...
** In lichens, the algal component is called phycobiont and fungal component is known as mycobiont, which are autotrophic and heterotrophic respectively. ** Viroid contains RNA of low molecular weight and no protein coat. ** A virus contains either
DNA vs RNADNA or deoxyribonucleic acid is a double-stranded molecule consisting of 2 polynucleotide chains wrapped around each other to form the double helix shape of DNA. The 4 nitrogenous bases found in DNA are adenine (A), thymine (T), guanine (G) and cytosine (C). RNA or ...
(进化)from pieces of DNA or RNA that "escaped" from larger organisms.The third one is that viruses co-evolved with their host cells,which means they existed alongside these cells. For the time being,these are only theories.The technology and proofs we have today cannot be used to test ...