Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1?
A. Protein A
B. Protein X
C. Protein Y
D. Metal A
E. Protein Z
Answer: D
You might also like to view...
A hair sample obtained during _______ growth will include the follicle.
Fill in the blank(s) with the appropriate word(s).
Using a six-sided die, what is the probability of rolling either a 5 or a 6?
A) 1/6 × 1/6 = 1/36 B) 1/6 + 1/6 = 1/3 C) 1/6 + 1/6 = 2/3
What term best describes the role of certain metal ions and coenzymes in metabolic processes?
a. reactants b. intermediates c. cofactors d. products e. catalysts
Prior to the onset of lactation, the mammary glands are prepared for the production of milk by
A) the hormonal action of estrogen and progesterone. B) the completion of ovulation. C) degeneration of the corpus luteum. D) deactivation of FSH, LH, and GnRH. E) synthesis of FSH.