【单选题】For each of the neurotransmitters below, select the amino acid from which Epinephrine is synthesized
【单选题】A polypeptide has the amino acid sequence glycine – arginine – lysine – serine. The table gives possible tRNA anticodons for each amino acid. Which sequence of bases on DNA would code for the polypept...
【单选题】Release of amino acid nitrogen and NH4+ is an important step in generating precursors for the urea cycle. Which statement best describes this release of amino acid nitrogen as NH4+ from amino acids?
A.
NH4+ freely diffuses across membranes.
B.
Glutamate deamination by oxidation is readily reversible.
C.
Serine deamination to pyruvate is readily reversible.
D.
Glutamine deamination to glutamate is readily reversible.
E.
NH3 cannot freely diffuse across membranes.
【判断题】动力CAN线如果断掉其中一根线路 不影响其正常使用
【单选题】An individual has been shown to have a deficiency in an intestinal epithelial cell amino acid transport system for leucine. However, the individual shows no symptoms of amino acid deficiency. This cou...
A.
The body synthesizes leucine to compensate for the transport defect.
B.
The kidney reabsorbs leucine and sends it to other tissues.
C.
There are multiple transport systems for leucine.
D.
Isoleucine takes the place of leucine in proteins.
E.
Leucine is not necessary for bulk protein synthesis.
【单选题】An individual has been diagnosed with Hartnup disease and is experiencing symptoms consistent with niacin deficiency. In this patient, which amino acid is no longer able to “ spare ” the dietary requi...