Explain the endosymbiotic theory. What is the evolutionary value of endosymbiosis?
What will be an ideal response?
Answer: The theory states that a chemoorganotrophic bacterium and a cyanobacterium were stably incorporated into a cell and gave rise to a mitochondrion and chloroplast (respectively), which formed a eukaryotic cell. Endosymbiosis provides a mutualistic relationship where the incorporated cells are protected from direct contact with the environment, and the cell that incorporated the cells gains metabolic diversity.
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Viruses, viroids, and prions all
A. operate intracellularly. B. may be considered acellular agents of disease. C. contain DNA. D. infect only animals. E. operate intracellularly AND may be considered acellular agents of disease.
To answer questions about the genetic changes underlying speciation, scientists are now isolating and sequencing
a. sympatric genes b. allopatric genes c. neutral mutations d. deleterious mutations e. speciation genes
Which factor would most affect an individual's basal metabolic rate?
A) caloric intake B) sleep habits C) balanced diets D) exercise levels
The ________ of a population is the time it takes for the cells to double in number.
A. binary fission B. exponential growth C. generation time D. arithmetic growth E. log phase