Enzymes are protein catalysts. What is the role of a catalyst? A. Provides extra energy for a reaction
B. Lowers the activation energy of a reaction
C. Allows only irreversible reactions to happen
D. Eliminates the activation energy of a reaction

2. what process do mrna and trna work together to complete? (3 points)

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.