How does an enzyme speed up a chemical reaction? enzymes:
a. lower the activation energy of chemical reactions.
b. raise the temperature of the cell, speeding chemical reactions.
c. store atp, allowing more energy to be used in chemical reactions.
d. act as a miniature “transfer trucks” gathering materials for chemical reactions and places them together.

Which of the following descriptions of proteins are true? i. proteins can have different sequences of amino acids. ii. proteins can have different shapes. iii. proteins can have different numbers of amino acids. a. only i and ii are true. b. only ii and iii are true. c. only i and iii are true. d. i and ii and iii are all true. e. none are true statements

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

Me.henley said, “in the rat race we call life, only the strong will survive.” he may have been referring to