#Question id: 958
#Unit 1. Molecules and their Interaction Relevant to Biology
Phenylketonuria (PKU) is a disease caused by a defect in ________ formation.
#Question id: 959
#Unit 1. Molecules and their Interaction Relevant to Biology
Phenylalanine hydroxylase requires molecular ________ and tetrahydrobiopterin.
#Question id: 960
#Unit 1. Molecules and their Interaction Relevant to Biology
Which amino acids are purely ketogenic?
#Question id: 961
#Unit 1. Molecules and their Interaction Relevant to Biology
Which type of organisms can eliminate excess nitrogen by the direct excretion of ammonia?
#Question id: 962
#Unit 1. Molecules and their Interaction Relevant to Biology
The carbon in urea originates from ________.
#Question id: 963
#Unit 1. Molecules and their Interaction Relevant to Biology
________ is hydrolytically cleaved to directly yield urea in the urea cycle.