Fumarase is the enzyme that catalyzes the following reaction between fumarate and water to produce malate in cells. Which statement can be used as evidence that orientation of reactant molecules is part of the function of fumarase as a catalyst?

a. The active site of fumarase contains a histidine and a lysine that function as an acid and a base, respectively, during catalysis.

b. Fumarase does not use a coenzyme but requires one Fe2+ ion at its active site.

c. Fumarase binds one fumarate molecule and one water molecule the same way for every reaction.

d. Mutation of the active site lysine to other amino acids obliterates or severely reduces activity in fumarate.

e. Fumarase catalyzes both the forward and reverse reactions between fumarate and malate.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.  

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the answer is c.

by: nicholas dooley

c is the correct answer!