Viruses are classified by:
a. the sequence of their DNA.
b. structural similarities.
c. the sequence of their rRNA genes.
d. the traditional Linnaean binomial nomenclature system.
e. an international committee
E
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Most temperate phages integrate into the host chromosome, whereas some replicate as plasmids. Which kind of relationship do you think would be more likely to maintain the phage in the host cell, and why?
A. Plasmids-they're smaller, so they'd be easier to replicate by the host cell. B. Integrated-the host cell would be less likely to view this DNA as "foreign" on subsequent rounds of replication, and would retain it more easily. C. Plasmids-these structures often carry other genes that may give the host cell a selective advantage over cells that don't have them. D. Integration-because plasmids are frequently lost during cell division, which could leave a daughter cell without the virus genome.
All species in the phylum Arthropoda share which of the following features?
a. segmented bodies b. book lungs c. three sets of legs d. a fused thorax
Which stage of translation is shown here?
a. initiation b. elongation c. termination d. peptide bond formation e. polysome activity
When homologous chromosomes or chromatids fail to separate properly in meiosis, this is called ________.
Fill in the blank(s) with the appropriate word(s).