Scientists have: (select all that apply.) a. observed amino acids forming spontaneously b. demonstrated how amino acids can form from the environment c. confirmed that the ultimate source of amino acids and proteins is from plants d. not yet determined the source of amino acids

What type of reaction is zn + cucl2 → cu + zncl2?

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

How does a noncompetitive inhibitor reduce an enzyme’s activity?