Vaccinia virus is often used in the technique to make
A. antibodies to toxin.
B. an adjuvant.
C. gamma globulin.
D. a "Trojan horse" recombinant vaccine.
E. a booster.
Answer: D
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Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) all of the above
When phosphorus is abundant in soils, it may by unavailable to plants because _____.
_____ the phosphorus is bound to nitrogen. _____ the phosphorus is unlimited. _____ the phosphorus is bound to clay. _____ the phosphorus is in a form that is not taken up by plants.
The mutated gene that causes cystic fibrosis is
a. CFTR b. CRFT c. CTFR d. CRTF e. CFRT
A media is designed that allows only staphylococci to grow. In addition, S. aureus colonies have a yellow halo around them and other staphylococci appear white. This type of media is
A. both selective and differential. B. enriched. C. differential only. D. a reducing media. E. selective only.