Which of the following results in comparatively long-lasting immunity?
A) An adult receives gamma globulin.
B) A baby receives antibodies to chicken pox across the placenta.
C) A person survives an infectious disease.
D) A baby receives antibodies against many pathogens through breastfeeding.
E) An adult receives antiserum.
Ans: C) A person survives an infectious disease.
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What is the current concentration of carbon dioxide in the atmosphere?
A. 100 parts per million B. 140 parts per million C. 42 parts per thousand D. 380 parts per million E. 1150 parts per million
What type of bonding occurs between mature tRNAs and mRNA?
a. covalent b. ionic c. hydrogen d. van der Waals
Microspores are indicated by
a. A. b. B. c. C. d. D. e. E.
Viruses are not considered to be alive, yet they share this ability with living cells:
a. They can metabolize food b. They can evolve c. They can reproduce on their own d. They can produce cell membranes e. They can synthesize proteins