The ________ of the microscope holds and allows selection of the objective lenses.
Fill in the blank(s) with the appropriate word(s).
nosepiece
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After the first exposure to an antigen, a ________ stimulates growth and multiplication of antigen-reaction cells
A) secondary innate immune response B) primary adaptive immune response C) phagocytic immune response D) hyperactive cytotoxic response
Which of the following statements about emerging viruses is false?
A. Emerging viruses are able to "jump" from one species to another. B. Hantavirus, which causes a hemorrhagic-type fever, originates in deer mice. C. Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%. D. The emerging virus SARS is a coronavirus. E. The stable genome of the SARS virus makes it an unlikely candidate for vaccine development.
DNA replicates conservatively, which means that one of the two daughter double helices is "old" and the other is "new."
Indicate whether the statement is true or false
A genetic element which can replicate autonomously when introduced into a cell grown in culture is a ________
Fill in the blank with correct word.