Mitotic cell division creates identical copies by replicating a cell's DNA __________ and then dividing ____________.
A. once twice
B. twice, once
C. twice, twice
D. once, once
E. None of the answers are correct.
D. once, once
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True or false: All 64 possible triplet sequences in an mRNA are recognized by a nucleic acid molecule
A. true B. false
The peripheral nervous system in a vertebrate can be divided into
A. the brain and spinal cord. B. the sympathetic and parasympathetic systems. C. the central nervous and sensory systems. D. the somatic and autonomic systems. E. muscles and glands.
Which of the following describes a function of the cell wall in prokaryotic cells?
a. preventing osmotic lysis b. facilitating mitosis c. ensuring sufficient nutrient flow d. protecting the hydrothermal vent
The difference between water purification and sewage treatment is
A. the types of microorganisms used for the treatment. B. whether the water source is residential or commercial. C. the amount of air pumped into the water for treatment. D. there is microbial degradation in sewage treatment, but not in water purification.