Explain how enzymes decrease the activation energy required for biological processes in our bodies
What will be an ideal response?
Enzymes decrease the activation energy by a combination of factors, including substrate orientation, formation of temporary chemical bonds, electrostatic interactions, and bond distortion.
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DNA associates very tightly with nucleosomes because
A. DNA can form covalent bonds with histone proteins. B. negative charges on DNA are attracted to positive charges of the histone proteins. C. the histone tails wrap tightly around the DNA double helix. D. the amino acids of histone proteins are largely acidic, while DNA molecules are basic. E. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
Stretch-sensitive muscle spindles are indicated
by a. A. b. B. c. C. d. D. e. none of these
Which of the following membrane activities does NOT require the expenditure of energy by the cell?
a. active transport b. osmosis c. endocytosis d. exocytosis e. synthesis of more membrane
Which of the following factors is the most important requirement in order for life to emerge?
a. the presence of liquid water b. the presence of air c. the presence of soil d. the presence of sunlight