What is the most efficient and cost-effective way to control infectious diseases?
A. variolation
B. active immunization by vaccination
C. passive immunotherapy using immunoglobulins
D. immune testing
E. autoimmunization
Answer: B
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Transmembrane movement of a substance up a concentration gradient requires ________ transport
Fill in the blank with correct word.
A student was studying a microorganism using a bright-field microscope. She was unable to resolve the microorganism on her first attempt. Based on the facts learned in class, what would you recommend the student do to increase resolution?
a. increase the amount of light b. use a lens with higher numerical aperture c. use anger wavelength light d. use a lens with lower numerical aperture
All of the following tumor-suppressor genes inhibit cell division EXCEPT
A. BRCA1. B. Rb. C. NF1. D. p16. E. Rb and p16.
Which of the following is an unusual event that occurs as trichomes differentiate?
a. DNA replication b. endoduplication c. cell expansion d. mitosis e. regulation of the cell cycle