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11/25/2023: Physics: Electrostatics and Magnetism

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Visit our site to see the additional cards and notes:  https://drawittoknowit.com/course/biochemistry/glossary/biochemical-pathway/electron-transport-chain

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Here's a flashcard from our MCAT Biology & Biochemistry Course! 

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See full flashcard & demo tutorials @ drawittoknowit.com

First drawing

Single circular chromosome with inner and outer strands. — In reality, bacterial DNA is arranged in loops. Recall that there is no distinct nucleus, as in eukaryotic cells; instead, DNA lies in the nucleoid region.

Origin of replication is marked by oriC; this is where the replication initiator proteins bind.

Terminus is located opposite oriC; this is the region where DNA replication terminates.

Second drawing After DNA replication begins:

Outer and inner parental strands begin to separate in bidirectional replication.

Replication "bubble," is the space between the strands.

Two y-shaped replication forks, one on each side of the bubble.

DNA helicases separate the parental DNA strands in short segments, thus creating the replication forks; if the two strands separated all at once, excessive DNA damage could occur.

Developing daughter strands: each one begins at the origin of its parental strand and grows towards its terminal end. — These complementary daughter strands are synthesized by the replisome,which comprises DNA polymerase III and other components.

Third drawing

The parental and growing daughter strands are further along in the replication process. — The parental strands have further separated from each other as the daughter strands grow towards the terminal region.

Fourth drawing

Finally, the chromosomes separate after the daughter strands are complete.

DNA replication is semiconservative: — Each new chromosome comprises one strand of DNA from the parental chromosome and one complementary daughter strand.

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