BISC207 Lecture Notes - Lecture 11: Thymine, Adenine, Guanine

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC207
• Professor: Olabisi Oyenike

Document Summary

Formed by polymerization of individual actin molecules into long strands. Grouped together into long bundles or dense networks. Usually found just inside the plasma membrane. Uses atp to change shape and do work. Cell crawling is caused by actin filaments growing in one direction, moving the cell. Many times exist, each consisting of a different protein. About 20 types of keratin: found in nails and hair. Large hollow tubes made of tubulin dimers. Have 2 polypeptides, called a-tubulin and b-tubulin. Serve as railroad tracks for vesicle transport. Vesicle attached to motor protein walks along microtubule. Researchers knew that chromosomes were comprised of dna and protein. 2 dna strands line up in the opposite direction to each other in antiparallel fashion. Secondary structure is stabilized by complementary base pairing. Dna molecules in eukaryotes are usually packaged with proteins called histones. Dna is like the blueprint of a cell. Biologists knew about dna, heredity, chromosomes, and genes.