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珍奥核酸是一种口服保健品，有用吗？
提问人：网友mumu2006517
发布时间：2022-01-07
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更多“珍奥核酸是一种口服保健品，有用吗？”相关的问题
第2题
DNA secondary structure is a right-handed double helix with a sugar phosphate backbone on the outside and paired bases (A-T, G-C) on the inside. Which of the following are true?
A、The two strands are parallel.
B、Van der Waal's forces between stacked bases destabilizes the structure.
C、The two strands are antiparallel.
D、A, B, and Z-DNA forms are present in nature.
E、Only the B-DNA form is present
第3题
【多选题】While studying the structure of a small gene that was recently sequenced during the Human Genome Project, an investigator notices that one strand of the DNA molecule contains 20A’s, 25G’s, 30C’s and 22T’s,how many of each base is found in the complete double-stranded molecule?
A、A=40, G=50, C=60, T=44
B、A=44, G=60, C=50, T=40
C、A=45, G=45, C=52, T=52
D、A=50, G=47, C=50, T=47
E、A=42, G=55, C=55, T=42
第4题
RNA also has some structure. These include all of the following except:
A、Hairpin turns
B、Internal loops and bulges
C、beta-helix
D、Right-handed double helix
E、Cloverleaf structure
第5题
The linkage between nucleotides is
A、2’,-3’ phosphodiester bond;
B、3’,-5’ phosphodiester bond
C、2’,-5’ phosphodiester bond;
D、Hydrogen bond
E、Peptide bond
第6题
The core proteins in nucleosome are
A、H2A, H2B, H3, H4.
B、H1A, H1B, H3, H4.
C、H1A, H2A, H3, H4.
D、H1, H2, H3, H4.
E、H2A, H2B, H1, H2.
第7题
All of the following are true of the differences between DNA and RNA except:
A、RNA utilizes uracil (U) in place of thymine (T).
B、RNA has a 2'-OH whereas DNA does not.
C、The nucleotides in DNA are linked 3'-5' by phosphodiester bonds but in RNA they are linked 2'-5'.
D、DNA is usually double stranded and RNA is usually single stranded.
E、There is more RNA than DNA in the cell.
第8题
The correct description about Tm is
A、The temperature at which half of the maximum absorbance value of DNA at 260nm during heat denaturation
B、The temperature at which maximum absorbance value of DNA at 260nm during heat denaturation
C、The optimum temperature for DNA synthesis
D、High Tm value is related to low G-C content
E、The temperature to form DNA and RNA hybrid molecule
第9题
The description of the secondary structure of DNA double helix are correct, EXCEPT
A、Two antiparallel strands
B、Deoxyribose-phosphate frame located outside the strands
C、Two strands are joined by hydrogen bond formed between A-T and G-C
D、Diameter of helix is 2 nm, and 10 bases in each turn
E、Nucleosome is the structure unit of DNA double helix
第10题
The hyperchromic effect refers to the increase in the UV absorption of DNA. This is a result of:
A、Annealing
B、Melting of DNA
C、B to Z-DNA conversion.
D、Increased hydrogen bonding between strands.
E、Renaturation of DNA
