UNE Biochemistry Unit 4 UPDATED Questions with CORRECT Answers

UNE Biochemistry Unit 4 UPDATED
Questions with CORRECT Answers
Which of the following amino acids is considered non essential because it is generated by the
urea cycle?


A. arginine


B. lysine


C. asparagine


D. glutamine


E. histidine - CORRECT ANSWER - arginine


The urea cycle takes place in which of the following subcellular locations?


A. the cytosol and the mitochondria


B. the mitochondria only


C. the cytosol only - CORRECT ANSWER - the cytosol and the mitochondria


Ubiquitination is a means of targeting a protein for which of the following cellular proceses?


A. Digestion

,B. Proteasomal degradation


C. Storage


D. Protein translation - CORRECT ANSWER - Proteasomal degradation


The reaction of ammonia with α-ketoglutarate is catalyzed by _________ and requires
_________ as a reactant.


A. glutamate dehydrogenase; ATP


B. glutamate dehydrogenase; NADH or NADPH


C. glutamate synthetase; NADH or NADPH


D. glutamate synthetase; ATP - CORRECT ANSWER - glutamate dehydrogenase; NADH
or NADPH


Most enzymes involved in protein digestion require cleavage for activation. These proteins are
secreted as inactive protein forms called:


A. zymogens


B. unfolded polypeptides


C. dimers


D. activated forms - CORRECT ANSWER - zymogens

, Which of the following enzymes is regulated by N-acetyl glutamate (NAGs)?


A. CPS II


B. ornithine transcarbamylase


C. arginosuccinate lyase


D. CPS I - CORRECT ANSWER - CPS I


Which of the following enzymes will be active in both the fed and fasted states?


A. Glutaminase


B. Pyruvate kinase


C. Hormone sensitive lipase


D. Glycogen synthase - CORRECT ANSWER - Glutaminase


Which of the following enzymes is correctly paired with its activator?


A. N-acetylglutamate synthtase; arginine


B. Carbamoyl phosphate synthetase I; ATP


C. Glutaminase; citrate