While of the following techniques or tools has provided information regarding the nature of viruses, which one had to be developed before the genetics, biochemistry, and life cycles of viruses could be thoroughly studied?
A. viral cultivation techniques
B. serological techniques
C. scanning electron microscopy
D. transmission electron microscopy
Answer: A
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The tendency of a molecule to have positive and negative regions
A) Polarity B) Compound C) Denaturation D) Monosaccharides E) Hydrogen bonds F) Element G) Triglycerides H) Amino acids I) Tertiary structure J) Active site
The diversity among human antigen receptors is attributed mainly to ________
a. structural changes that occur to antibodies after antibodies meet antigens b. random splicing of antigen receptor gene segments c. all of the choices d. large numbers of genes for antibodies
A radial nervous system is characteristic of the sea star
____________________ Indicate whether the statement is true or false.
)
A. Complement B. Toll receptors C. Interferon D. Peptidoglycan E. Lipopolysaccharide