Biology 1002B Lecture Notes - Lecture 3: Phototaxis, Central Dogma Of Molecular Biology, Mutation Rate

• School: Western University
• Department: Biology
• Course: Biology 1002B
• Professor: Denis Maxwell

Document Summary

Have sufficient energy so they move away. +(cid:448)el(cid:455) photota(cid:272)ti(cid:272)= (cid:373)a(cid:455)(cid:271)e do(cid:374)"t ha(cid:448)e e(cid:374)ough suga(cid:396) i(cid:374) (cid:272)ells, so the(cid:455) (cid:373)o(cid:448)e to(cid:449)a(cid:396)ds light. Light can be harmful (visible wavelengths of light) Excess light can be harmful- cannot be stored. Vely phototactic= maybe have too much sugar, so they move away from light: can damage the cells. Today- bacteria, archaea, eukarya: none are any more ancient than other. Luca (3. 5 bya: no fossil evidence, no physical evidence, look at similarities in dna between the three, mitochondria mutation rate. One of the characteristics could have evolved independently. More than one form of life could have started using the idea of atp. All forms of life share all of these characteristics- chance of this occurring randomly is very unlikely. Do(cid:374)"t have to use glu(cid:272)ose & gl(cid:455)(cid:272)ol(cid:455)sis, (cid:272)ould (cid:272)o(cid:373)e up (cid:449)ith so(cid:373)ethi(cid:374)g else, (cid:271)ut (cid:374)o (cid:272)ell does any other way. Simplest explanation: there was a unifying common ancestor (luca) Luca- 3. 5 bya, life started 4 bya.