MHC class I molecules present peptide fragments that are either "self" or "nonself"; in either case, the fragment becomes bound to the molecule while

a. in the rough endoplasmic reticulum.
b. in the cytosol.
c. in the Golgi apparatus.
d. in a secretory vesicle.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

the correct answer is: " ventricles " .

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