Why is so much emphasis placed on the genomic composition (e.g., ssRNA, dsDNA) of individual viruses. Provide examples to support your explanation
What will be an ideal response?
Answer: Answers will vary but should highlight the difference of viral genome diversity in composition compared to the three domains of life which are dominated by dsDNA genomes. Because different viruses genomes composition is so diverse, where some are positive ssRNA, negative ssRNA, dsRNA, positive ssDNA, and dsDNA, fundamental molecular mechanisms are also diverse. The genome composition often dictates which proteins must be carried and not made by the host, the type of genome replication mechanism, and the way transcripts are synthesized.
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Sigma (?) factors can regulate the initiation of transcription. Which of the following is not an example of ? regulation?
A) Some ? factors recognize promoters for genes whose products are necessary when the organism is under stress, such as heat shock. B) Some ? factors recognize genes necessary for nitrogen utilization. C) Bacteriophages may code for specific ? factors that bind the core RNA polymerase and result in recognition of viral promoters. D) There are many ? sigma factors associated with eukaryotic organisms.
How do flagella bend?
a. myosin motor proteins slide microtubules over each other b. dynein motor proteins slide microtubule doublets over each other c. myosin motor proteins slide actin filaments over each other d. microfilaments contract due to the action of kinesin e. actin filaments contract due to the action of myosin
Which group exhibits the longest generation time?
a. bacteria b. plants c. animals d. protists e. fungi
In liverworts, when are the pores (not true stomata) open?
a. daytime b. nighttime c. they do not close d. they are never open