According to the table and the figure above, which enzyme is defective in the strain with the arg2 mutation?
A) the enzyme that converts the precursor to ornithine
B) the enzyme that converts ornithine to citrulline
C) the enzyme that converts citrulline to arginine
D) the enzyme that converts the precursor to citrulline
Answer: B
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Collectively, what did the work of Charles Darwin, Francis Darwin, and Fritz Went demonstrate about phototropism in plants? Select all correct choices
A. A chemical signal is produced in shoot tips in response to light. B. A chemical signal is produced in shoot stems in response to light. C. Cells exposed to a chemical signal produced by light will grow (elongate). D. Cells exposed to a chemical signal produced by light will not grow (elongate).
If an enzyme is saturated, ____
a. it cannot continue to catalyze the reaction b. the reaction is at equilibrium c. the rate of the reaction will slow and the reaction will stop d. it recruits more reactants e. the reaction is being catalyzed at the maximum rate
The normal cell cycle for body cells follows a prescribed timeline based on genetic information contained within the cells. Suppose the cell cycle continues on with mitosis occurring even when it should not. What might happen?
A) A gamete may be produced. B) A tumor might grow. C) An extra limb may form. D) Viruses might replicate.
Recognition proteins, such as those embedded on the surface of red blood cells, are composed of
A) glycoproteins. B) phospholipases. C) nucleic acids. D) steroids.