The enzyme found in mucus that destroys bacteria is ____
a. lysozyme
b. peroxidase
c. enterokinase
d. peptidase
e. lactose dehydrogenase
ANSWER: a
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Pecking behavior in young herring gulls is triggered primarily by ____
a. hunger b. the shape of the parent gull's head c. a red spot on the bill of the parent d. the overall body silhouette of the parent bird e. presence of predators
When studying Drosophila genetics, Morgan found that the haploid chromosome number equals the number of
A) bouquets. B) linkage groups. C) centromeres. D) haploid gametes. E) cohesins.
Which of the following mass extinction events is correct?
A. At the end of the Cretaceous period, over 90% of the species went extinct due to a meteorite impacting the Earth's surface and causing a cloud of ash to reduce solar exposure for several weeks. B. During the Permian period, over 90% of the species disappeared due to an excess of carbon dioxide in the atmosphere. C. At the end of the Devonian period, 70% of the terrestrial vertebrates went extinct when Gondwana drifted back towards the South Pole. D. At the end of the Ordovician period, over 90% of the species went extinct due to a meterorite impacting the Earth's surface and causing a cloud of ash to reduce solar exposure for several weeks.
Which of these is a symptom of vitamin A deficiency?
A) anemia B) severe combined immunodeficiency disease (SCID) C) diabetes D) blindness E) blood doping