How many different codons are part of the genetic code?
a. 4
b. 16
c. 32
d. 64
e. 128
ANSWER: d
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The following are all main points of the section Adaptations to Extreme Cold except:
a. 90% of fish biomass in Antarctic seas belongs to a single species of fish. b. sugar and protein molecules in fish cells prevent fish from freezing c. some Antarctic fish lack hemoglobin in their blood. d. some Antarctic fish lack red blood cells. e. global warming may place these fish in danger of extinction.
During the process of swallowing, the
a. esophagus is temporarily closed by the glottis. b. epiglottis closes the trachea leading to the lungs. c. pharynx restricts food entry to the esophagus. d. epiglottis seals the esophagus. e. glottis seals the esophagus.
Which of the following is an adaptation of black-tailed prairie dogs?
a. modified digestive tracts to easily digest seeds and leaves of grasses b. transition to a carnivore lifestyle c. movement towards above ground living d. hibernation throughout the spring e. movement towards living in small social groups
What is the main role of human chorionic gonadotropin?
A. It is similar to FSH in stimulating follicle development. B. It stimulates the release of oxytocin from the mother's pituitary. C. It maintains the corpus luteum. D. It allows the mother to realize she is pregnant, via pregnancy tests.