Biological nitrogen fixation is accomplished by
A) protozoans.
B) bacteria.
C) fungi.
D) plants.
B
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Memory and learning take place in which area of the brain?
A. cerebellum B. cerebrum C. hypothalamus D. pons and medulla
In eukaryotic cells, which occurs during mitosis?
a. the duplication of chromatids b. the replication of DNA c. the pairing of homologous chromosomes d. the fragmentation and disappearance of the nuclear envelope and nucleolus e. a cleavage furrow is formed
What would happen if the septum did not form during binary fission?
a. The chromosome could not replicate. b. Nothing; the septum is not required for binary fission. c. The parent cell would now have two copies of the chromosome. d. The daughter cells would not be genetically identical.
What factors may have played a role in the patient's development of pneumonia after surgery?
A. His immune system was depleted by excessive IV fluids. B. His caregiver at the hospital did not use proper handwashing technique. C. His visitors wore gowns and masks when entering his room. D. His caregiver maintained his bed in an upright position after his surgery.