The endosymbiotic theory says that precursor eukaryotic cells acquired mitochondria by endosymbiosis with a ________ ancestor, and others gained photosynthetic ability from endosymbiosis with a ________ ancestor.
A. archaea, cyanobacteria
B. protozoan, algae
C. helminth, algae
D. rickettsial, cyanobacteria
E. None of the choices are correct.
Answer: D
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Which of the following is a statement of the first law of thermodynamics?
A) Energy cannot be created or destroyed. B) The entropy of the universe is decreasing. C) The entropy of the universe is constant. D) Kinetic energy is stored energy that results from the specific arrangement of matter. E) Energy cannot be transferred or transformed.
Which event cannot be determined by looking at the annual rings of a tree? a. Evidence of fires b. All can be determined by looking at the annual rings of a tree
c. Evidence of pests in the community d. Age of the tree e. Evidence of diseases in the community
Populations of bay checkerspot butterflies that occupy large patches of suitable habitat serve as sink
populations for individuals that recolonize small patches of suitable habitat where butterfly populations frequently become extinct.
Indicate whether the statement is true or false.Based on part 2 of Figure 41-2, the ions involved in __________ are __________
a. depolarization; Clb. repolarization; K+ c. depolarization; Na+ d. repolarization; Cl? e. hyperpolarization; Na+