To deal with the absence of RNA-dependent RNA polymerases in host cells, which evolutionary trait(s) have RNA viruses developed to ensure successful replication in host cells?
a. They carry RNA replicase in their virions.
b. They encode RNA replicase in their genomes.
c. They carry RNA replicase in their virions and encode RNA replicase in their genomes.
d. They do not infect cells that do not have RNA replicase.
Answer: C
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Answer the following statements true (T) or false (F)
1. Most oncogenes encode proteins that function in cell growth signaling pathways. 2. p53 is a tumor suppressor gene that acts as a sensor of DNA damage. 3. Certain types of cancer are caused by viruses. 4. Sexual life cycles include both haploid and diploid stages.
Logistic population growth describes growth without limitation
Indicate whether the statement is true or false.
The part of the brain that controls the basic responses necessary to maintain life (such as breathing and heartbeat) is
the ____. a. medulla oblongata b. corpus callosum c. pineal gland d. cerebellum e. cerebral cortex
Both DNA and RNA are made up of building blocks known as
A. genes. B. codons. C. amino acids. D. nucleic acids. E. nucleotides.