All enzymes act by
a. breaking hydrogen bonds between molecules.
b. lowering the activation energy of specific chemical reactions.
c. breaking and forming ionic bonds between ions.
d. allowing products to be changed during the chemical reactions.
e. raising the activation energy of specific chemical reactions.
B
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When migrating cells move toward a greater concentration of a diffusible chemical, the chemical is called a ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following occurs in prophase?
a. sister chromatids attach b. DNA replicates c. chromosomes align in the middle of the cell d. the nuclear envelope breaks down e. sister chromatids separate
Natural selection would have selected for those protocells and cells that were more able to use the energy available in their environment to allow growth and replication.
a. true b. false
When cytosolic levels of iron increase, intracellular ferritin levels will
A. drop until iron levels increase further. B. increase. C. decrease. D. fluctuate by increasing and decreasing in a random fashion. E. not change.