Compare and contrast a typical bacterial growth curve and a viral one-step growth curve. Explain why the growth curves are different based on bacterial and viral replication
What will be an ideal response?
Answer: Figure 8.7 illustrates the phases of the viral growth curve. The time where replicated viruses remain in the host is called the latent period, which ends once the viruses are released. The host cell lyses, and the replicated viruses are released. If 18 viruses are released per host cell, then the burst size is 18. Burst sizes can vary between a few and a few thousand. Bacterial growth is very different than viral growth because each cell divides to form two new cells with every generation, thus the increase in the population is continuous and is an exponential function (2x). Even though there is a lag phase in the bacterial growth curve, this period is when the cells are adapting to the new culture conditions and is NOT equivalent to the latent period seen in viral growth.
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In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. auxin B. ethylene C. abscisic acid D. gibberellin E. cytokinin
Which of the following cells stop dividing once fully formed?
a. bone cells b. cheek cells c. liver cells d. muscle cells e. nerve cells in the brain
How are retroviruses and retrotransposons similar? Describe the genes encoded by the DNA of the retrovirus and the two DNA elements consistently found in retrotransposons
What will be an ideal response?
The arrangement of organisms into taxa
A) shows degrees of relatedness between organisms. B) shows relationships to common ancestors. C) was designed by Charles Darwin. D) is arbitrary. E) is based on evolution.