The methanogenic archaeans are ____ that pull
electrons from ____.
a. chemoautotrophs; oxygen
b. chemoheterotrophs; carbon dioxide
c. chemoautotrophs; water
d. chemoheterotrophs; methane
e. chemoautotrophs; hydrogen gas
E
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Which of the following statements is true?
a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits. b. Homologous chromosomes differ in banding patterns, the traits they code for and size. c. While sex chromosomes determine different genders they look the same until they are stained. d. In humans all 46 chromosomes have an identical match called the homologue.
A homeschooled child recently visited an ailing great-grandparent who was complaining of a painful rash. Even though the child had had no contact with children suffering from chickenpox, the child developed chickenpox. How did the child contract the infection?
A) The virus was likely contracted from fomites. B) The adult had chickenpox and exposed the child. C) An insect vector infected the child. D) The adult had shingles and the child was exposed to virus particles. E) There is insufficient information for a conclusion.
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
Which of the following compounds is NOT an enzyme?
A) dehydrogenase B) cellulase C) coenzyme A D) ?-galactosidase E) sucrase