Which of the following must bring in a virion-associated RNA-dependent RNA polymerase when it infects host cells?
A. +dsRNA viruses
B. ?ssRNA viruses
C. +ssRNA viruses
D. All of the choices are correct.
Answer: B
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The ________ zone is also known as the shallow subtidal zone
Fill in the blank(s) with the appropriate word(s).
Melatonin is produced by the pineal gland
____________________
In monocots such as palms considerable increase in girth is achieved by:
a. secondary growth. b. primary growth. c. a modified form of primary growth in which parenchyma cells divide and enlarge. d. enlargement of primary xylem. e. enlargement of primary phloem.
Answer the following questions true (T) or false (F)
1. Mucocutaneous leishmaniasis, also known as kala-azar, is fatal in 100% of untreated cases. 2. Smallpox vaccination was originally discontinued in the 1970s in the U.S. because of adverse effects of the vaccine. 3. Herpesvirus infections can be controlled with chemotherapeutic agents.