Proteosomes are multifunctional, multisubmit protein

Proteosomes are multifunctional, multisubmit protein complexes that
A.  convert amino acids to glucose and ketone bodies during starvation.
B.  degrade most cellular proteins to their consistent amino acids.
C.  facilitate the endocytosis of lipoproteins by most cells.
D . participate in the digestion and absorption of dietary protein.
E.  synthesize albumin and other plasma proteins in the liver.


During initiation of protein synthesis in prokaryotic and eukaryotic systems, GTP is hydrolyzed
A.  to GMP when mRNA joins the ribosome.
B.  to GMP when the large ribosomal subunit joins the growing initiation complex.
C.  to GDP when mRNA joins the ribosome.
D.  to GDP when the large ribosomal subunit joins the growing complex.
E.  none of the above


Post-translational modification of polypeptide chains refers to
A.  addition of various groups to the side chains of specific amino acids.
B.  specific cleavage of an amino acid sequence from the translated chain.
C.  replacement of a wrong incorporated amino acid by the proper one.
D.  A and B.
E.  A and C.