Mimivirus contains some of the genes required for protein synthesis. This is cited as support for which hypothesis about the origins of viruses?
A) degeneration
B) origin of life
C) escaped-genes
D) transposable elements
Answer: A
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F- strains of Escherichia coli
A) do not have an F factor. B) have the F factor as a plasmid. C) have an integrated F factor. D) transfer the F factor to other strains at a high frequency.
Target tissues for steroid hormones and thyroid hormones do not have membrane receptors for these
hormones because they
a. stimulate the cell by changes in electrical activity. b. are water soluble. c. enter the cell by ion channels. d. are small enough to diffuse directly into the cell. e. are soluble in the lipid bilayer.
Which of the following has been used to measure more precisely the relatedness of primates?
a. hemoglobin b. blood type c. family trees d. convergence e. fossils
A shuttle vector is a plasmid that is used to move pieces of DNA among organisms, such as bacterial, fungal, and plant cells
Indicate whether the statement is true or false