Bacterial DNA has how many origins of replication?
A. 0
B. 1
C. 10
D. Depends on the size of the DNA
B
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What evidence supports the theory of an early "RNA world"?
What will be an ideal response?
Gram staining divides bacteria into ____
groups based on differences in the composition of their ____. a. two; DNA b. four; capsules c. two; cell walls d. four; cell walls e. two; plasma membranes
A physician is listening to a patient’s heart and notices an abnormal “dup” sound on the left side. This indicates a potential problem with the ____.
a. mitral valve b. bicuspid valve c. tricuspid d. pulmonary vein e. aortic semilunar valve
Which of the following is not a problem in applying the biological definition of species?
a. asexually reproductive organism b. greenhouse hybrids c. reproductive isolation from other species d. self-fertilization e. extinct organisms