生物题目（Biological topics）.docVIP

生物题目（Biological topics） 1., the main contents of molecular biology include DNA recombination technique; Regulation of gene expression; Molecular structure and function of biological macromolecules -- structural molecular biology; Genomics, functional genomics and bioinformatics. 2. prove that DNA is the two critical experiment of genetic material Streptococcus pneumoniae; transformation test; bacteriophage infection test Which two parts comprise the 3. chromosome?. DNA and protein. Calculation of base number of massage in 4. DNA molecule C value: the DNA content in a haploid genome. The higher the degree of evolution, the higher the C value of the organism. Contradiction between C values: C values are not consistent with the complexity of biological structure or composition. In species with similar structure and function, C values vary greatly even in species close to each other. In different evolutionary orders, the C values of some lower organisms are greater than the C values of higher organisms. Description of 5.DNA primary structure and double helix structure model The primary structure of DNA: the arrangement of nucleotides in DNA molecules, the order of DNA (or sequences). DNA molecules are mainly composed of four nucleotides, dAMP, dGMP, dCMP and dTMP. The function of a gene depends on the primary structure of DNA Double helix structure: the basic form of DNA two stage structure. Two DNA single strand antiparallel. Right hand double helix structure. Base pairing: AT, CG. 6., maintain the stability of DNA double helix structure of the main factors Base stacking forces (hydrophobic interactions), hydrogen bonds, ionic bonds, and Fan Dehua gravity 7., about the degeneration of DNA Definition: under the influence of physical and chemical factors, the two complementary strands of DNA double helix are loosely separated into single chains, which leads to the change of physical and chemical properties and biological properties of DNA. Influencing factors: high tempe