The rate-limiting enzyme of the pentose phosphate pathway is ( )
A. gluconic acid-6-phosphate dehydrogenase
B. lactonase
C. hexokinase
D. glucose-6-phosphate dehydrogenase
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The active form of glucose in glycogenesis is ( )
A. UDPG
B. TDPG
C. ADPG
D. CDPG
Structures of 20 amino acids in native proteins show ( )
A. all amino acids are in L form
B. all amino acids are in D form
C. all amino acids are in L form except glycine
D. all structures are in D form except glycine
The chemical bond stabilizing the primary structure of proteins is ( )
A. hydrophobic interaction
B. hydrogen bond
C. peptide bond
D. ionic bond
Which base is found only in RNA but not in DNA? ( )
A. U
B. A
C
D. G
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