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Lecture 2

EASC 101 Lecture 2: bio2


Department
Earth and Planetary Sciences
Course Code
EASC-101
Professor
A N O N Y M O U S
Lecture
2

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The side chains of the amino acids ultimately
help to determine the molecules’ shapes &
behaviours
20 amino acids
9 essential
some conditionally
essential
Amino Acids
Essential amino acids
Without these essential nutrients, the body cannot
make the proteins it needs to do its work
Can only be replenished from foods
Thus, a person must frequently eat the foods
that provide them
Amino Acids
Recycling Amino Acids
In addition to making some amino acids the body
breaks down proteins & reuses those amino acids:
Food proteins & body proteins are dismantled to
liberate their component amino acids
Providing the body with the raw materials
from which it can build the protein
molecules it needs
How Do Amino
Acids Build Proteins?
Strand of protein does not remain a straight chain:
Amino acids at different places along the strand are
chemically attracted to one another
Causes some segments of the strand to coil
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