What advantageous uses have viruses been shown to have?
A) The activities of viral genes mimic those of host genes so they are useful for studying mechanisms of DNA replication and gene expression in their much more complex hosts
B) all of the choices are correct
C) Bacteria-killing viruses may play an increasing role in the way against bacterial pathogens
D) insect killing viruses may play an increasing role in the way against insect pests
E) They can be used as a means to introduce foreign genes into human cells, which may serve as a basis for treatment of human diseases by gene therapy
Ans: B) all of the choices are correct
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Lipopolysaccharides are a common class of T-dependent antigens.
Answer the following statement true (T) or false (F)
A cell produces proteins when ribosomes (a form of RNA and protein) and transfer RNA (tRNA) work together. Specific amino acids are brought by tRNA into the ribosome, where they are rapidly connected by covalent bonds. This indicates that ribosomes are acting as
A. enzymes. B. substrates. C. a source of energy. D. active sites. E. reactants.
Which structure begins protein digestion under acidic conditions?
a. mouth b. stomach c. small intestines d. large intestines e. liver
A sequence of three RNA bases can function as a(n)
A) gene only. B) codon or anticodon. C) codon only. D) anticodon only.