The three cell types discussed, eukaryotes, archaea, and bacteria, all derived from ________.
A. photosynthetic bacteria
B. archaea
C. cells with a true nucleus
D. the last universal common ancestor
Answer: D
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Clonal selection is an explanation for how _____
A) a single type of stem cell can produce both red blood cells and white blood cells B) V, J, and C gene segments are rearranged C) an antigen can provoke production of high levels of specific antibodies D) HIV (human immunodeficiency virus) can disrupt the immune system E) macrophages can recognize specific T cells and B cells
When an enzyme-catalyzed reaction reaches equilibrium ____
a. the enzymes are now inhibited b. the chemical reactions cease c. the rate of the forward and reverse reactions are equal d. the concentration of reactants equals the concentration of products e. ATP is no longer required to drive the reaction
How are two different species most likely to evolve from one ancestral species?
A) sympatrically, by a point mutation affecting morphology or behavior B) sympatrically, due to extensive inbreeding C) allopatrically, due to extensive inbreeding D) allopatrically, after the ancestral species has split into two populations
An ionic bond between two atoms is formed as a result of the ______________
(a) sharing of electrons. (b) loss of electrons from both atoms. (c) loss of a proton from one atom. (d) transfer of electrons from one atom to the other.