An example of a pheromone in humans is
A. the mother's milk that transfers immunity to the infant.
B. testosterone.
C. a chemical released by males that reduces premenstrual tension in women.
D. saliva exchanged during kissing (as a sexual stimulant).
Answer: C
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Which one of the following types of organisms most closely resembles the original prokaryotes?
A. algae B. bacteria C. fungi D. plants E. animals
The transition from the conducting to the respiratory zone in the lungs occurs at the
A) respiratory bronchioles. B) tertiary bronchi. C) alveoli. D) terminal bronchioles. E) alveolar ducts.
Fertilization in all animal species results in formation of a fertilization envelope which:
A. Prevents the zygote from dehydrating B. Prevents more sperm from fertilizing the same egg C. Permits the egg to implant in the uterine wall
The electrons derived from the oxidation of H2O to O2 are used to reduce ______ to ________.
Fill in the blank(s) with the appropriate word(s).