The toxic superoxide ion is converted to harmless oxygen by two enzymes,
A. catalase and hydrogen peroxidase.
B. superoxide dismutase and catalase.
C. superoxide dismutase and hydrogen peroxidase.
D. catalase and oxidase.
E. superoxide dismutase and oxidase.
Answer: B
You might also like to view...
In the roundworm Caenorhabditis elegans, development of the vulva begins when the ____ secretes ____, which then bind(s) to _____ on the _____
A. progenitor cell; EGF; the EGF receptor; anchor cell B. progenitor cell; transcription factors; cisregulatory regions; anchor cell C. anchor cell; EGF; the EGF receptor; progenitor cell D. anchor cell; transcription factors; cisregulatory regions; progenitor cell E. Type 1 cell; EGF; the EGF receptor; Type 2 cell
The genetic model of colon cancer states that development of colo-rectal cancer requires only one key
mutation. Indicate whether the statement is true or false.
Which of the following best describes the structure of how water molecules form and interact?
a. Hydrogen atoms bond with each other to create a stable outer shell of electrons. Then they form a hydrogen bond to an oxygen atom to create the water molecule. b. Oxygen atoms transfer one electron to each of the hydrogen atoms, forming an ionic bond that attracts other water molecules to it. c. The oxygen atom and hydrogen atoms form a covalent bond with one another to create stable outer shells of electrons. d. The electrons are shared unequally resulting in a polar molecule whose slight charges form weak hydrogen bond attractions with other water molecules. e. Hydrogen bonds are formed between the two hydrogen atoms and the oxygen atom. This water molecule then forms a covalent bond with adjacent water molecules. f. The oxygen atom is more electronegative than the two hydrogen atoms. Due to this, it removes the electron from each hydrogen atom. This satisfies the outer shell of oxygen. Then hydrogen bonds form between the two remaining hydrogen atoms to hold them near to the oxygen atom.
The terminator versus anti-terminator function of the T box-based riboswitch used by Gram-positive bacteria to regulate amino acid-related genes is determined by ________.
A. the binding of the appropriate uncharged tRNA B. the rate of leader peptide synthesis C. the utilization of the appropriate sigma factor by RNA polymerase D. the binding of the T box binding protein