Refer to the Figure and Table Below

question 46

Multiple Choice

Refer to the figure and table below. The figure shows a metabolic pathway catalyzed by a series of enzymes labeled with numbers.The metabolite T was tested for inhibitory effects on each enzyme in the pathway, and the results are summarized in the table.The extent of inhibition is indicated by the number of plus signs.Lack of inhibition is indicated by a minus sign.Which statement gives a valid conclusion from these results?

• A) The production of T is not regulated by feedback inhibition.
• B) The inhibitory mechanism of T involves reversible phosphorylation.
• C) T is a competitive inhibitor of E4.
• D) The step from X to Y is the first commitment step in the production of T.
• E) The step from Q to R is the first commitment step in the production of T.

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Definitions:

Big-Game Hunting

Big-game hunting involves the tracking and hunting of large animals, often for food, sport, or traditional cultural practices.

Microlith

Small, often pointed stone tools that were part of the toolkit in prehistoric times, used as spear points or arrowheads.

Blade

A thin, flat edge or surface used for cutting or shaping materials, found in tools such as knives, swords, and blades of grass.

Neolithic Transition

The period marking the shift from hunting and gathering communities to agricultural and settlement societies, bringing about significant changes in human lifestyle and culture.