A Research Scientist Is Studying Biochemical Reactions That Take Place

question 134

Multiple Choice

A research scientist is studying biochemical reactions that take place in the liver.  He cultures hepatocytes in a growth media enriched with glutamate labeled with nitrogen isotopes.  After some time, he finds that the nitrogen isotopes are transferred to oxaloacetate, forming aspartate in the process.  Which of the following substances is most likely involved in this reaction?

• A)Biotin
• B)Folic acid
• C)Niacin
• D)Pyridoxine
• E)Riboflavin
• F)Thiamine

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Definitions:

Recessive

Describes a gene that is expressed in offspring only when it is inherited from both parents, as opposed to a dominant gene.

Epigenetics

The study of heritable changes in gene expression that occur without changes to the DNA sequence itself.

Genotype

The genetic makeup of an individual organism, encompassing all of its genes.

Phenotype

The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.