The Enymatic Rate Constant K_cat/K_m) of Orotidine 5ʹ-Phosphate Decarboxylase Is

question 19

Multiple Choice

The enymatic rate constant k_cat/K_m) of orotidine 5ʹ-phosphate decarboxylase is 6 x 10⁷ M^-1s^-1 and the nonenzymatic rate constant k_n) is 3 x 10^-16 s^-1. What is the value of the enzymeʹs catalytic proficiency?

• A) 2 x 10²³ M^-1
• B) 5 x 10^-24 M
• C) 12 x 10^-9 M^-1s^-2
• D) 8.3 x 10⁷ Ms²
• E) Cannot calculate the proficiency without knowing the value of V_max.

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Definitions:

Germ Layer

In early embryonic development, one of the three primary layers (ectoderm, mesoderm, and endoderm) that give rise to all tissues and organs of an organism.

Dermis

The layer of skin beneath the epidermis that contains nerve endings, sweat glands, and hair follicles.

Ectoderm

The outermost of the three primary layers of an embryo that develops into the nervous system, skin, and related structures.

Germ Layer

One of the primary layers of cells (endoderm, mesoderm, ectoderm) in the early embryo that gives rise to all tissues and organs of the organism.