What type of vaccine is the hepatitis B vaccine?
A) inactivated whole pathogen
B) attenuated vaccine
C) toxoid vaccine
D) a recombinant vaccine composed of a single antigen of the hepatitis virus
E) a vaccine produced by treating the virus with formaldehyde
D
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Adult zebra mussels are __________, and they are __________ when in the early stages
a. invisible; invisible b. invisible; visible c. visible; invisible d. visible; visible
About ________ percent of the human genome sequence comes from retroviruses.
A) 4 B) 8 C) 12 D) 21
A man with trisomy 21 could pass Down syndrome to offspring if he
A) produces sperm that have two copies of chromosome 21. B) produces sperm lacking chromosome 21. C) also has Turner syndrome. D) is a carrier of a deletion for chromosome 21.
A species that has population levels so low it faces
extinction in all or part of its range is designated as a. riparian. b. endemic. c. endangered. d. fragmented. e. an indicator.