Experiment 2 3 4 live cells live cells heat heat- of harmless of killer killed live killed strain strain R S (R) (S) cells cells cells 十 涕 mice live mice die mice live mice die Outcome in blood samples taken from mice no live live no live live bacteria S cells bacterial S cells cells in blood in blood cells in blood in blood
DNA结构的推衍 Chargaff: T+C=A+G A=T G=C X线衍射: DNA在两条链组成,相互平行
DNA结构的推衍 Chargaff: T+C=A+G A=T G=C X线衍射: DNA在两条链组成,相互平行
核酸的组成 DNA RNA 脱氧核糖 核糖 腺嘌吟胞嘧啶腺嘌呤胞嘧啶 鸟嘌呤胸腺嘧啶鸟嘌呤尿嘧啶 双链 单链
核酸的组成 DNA RNA 脱氧核糖 核糖 腺嘌吟 胞嘧啶 腺嘌呤 胞嘧啶 鸟嘌呤 胸腺嘧啶 鸟嘌呤 尿嘧啶 双链 单链
034 nanometer distance pewee each Dase pad 3 4 nanometers one complere twist or the double helix HHH O-(P-O 6H2 O-P-O H
unzipped newly new DNA forming polypeptide region RNA chain 3. Some proteins serve as structural PROTEINS materrals etc 4. Some proteins CARBOHYDRATES serve as the enzymes used in synthesizing LIPIDS other substances OTHER ORGANIC MOLECULES 1. An RNA strand is assembled 2. Each nuc eotide triplet calls 5. These substances end up accoraing to a sequence of for a specific amino acid (green n new membranes, new code words(nucleotide biocks) which becomes linked into cytoplasm, new organelles triplets)in a gene region o: a po peptide chain at the and so on DNA Then the RNA moves cors ruction site. One or more to construction sites in the chains will become tolded and op asm wasted into a protein molecule