Edward Jenner's work involved
A. inoculation of dried pus from smallpox pustules into a person to stimulate immunity.
B. immunization using a related, less pathogenic organism to give protection against a more pathogenic one.
C. development of an immunization to protect people against cowpox.
D. development of passive immunotherapy.
Answer: B
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The tree in the figure is based on which type of traits, and what is the name of the genus for the most recent horse?
A. Genetic (DNA): Orohippus.
B. Morphological: Equus.
C. Molecular: Equus.
D. Genetic homology: Pliohippus.
E. Morphological: Hyracotherium.
Which of the following is not an adaptation for flight in marine birds:
1.ectothermic 2.high metabolic rate 3.advanced respiratory system 4.keen senses
How many different amino acids are found in humans?
a. 4 b. 8 c. 12 d. 16 e. 20
Microbes known as transient microbiota are
A. microorganisms that remain with the person throughout life. B. microorganisms that may cause a disease under certain circumstances. C. organisms that remain in the body for a short time. D. unsuccessful microbial invaders because of the presence of preexisting microbes. E. sources of microbial contamination.