Which feature of amphibians makes them more susceptible to environmental toxins and pollutants than other animals?
A. thin, permeable skin
B. small size
C. preference for aquatic environments
D. insectivorous diet
E. small lungs
A
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Which of the following most adequately describes how the Alu element may have proliferated to constitute 10% of the human genome?
A. Multiple retroelements code the same gene. B. Retroelements increase with every generation. C. A single retroelement can be copied into many RNA transcripts. D. Retroelements increase with each cell division. E. Retroelements show self-proliferation.
Cephalopods are the only mollusks that possess
a. a mantle. b. gills. c. a closed circulatory system. d. shells. e. a closed circulatory system and shells.
Imagine that you are an archaeologist on a dig somewhere on an East Asian island and than you begin to excavate an area littered with stone tools that also has the remains of an ancient fire
Subsequent carbon dating of the charcoal from the fire yields a date of 100,000 years before the present. Given these circumstances, which species would you expect most likely set that fire? A) Australopithecus afarensis B) Homo erectus C) Homo ergaster D) Ardipithecus ramidus
_______ are large glycoprotein molecules that serve as the specific receptors of B cells and as antibodies.
A) Immunoglobulin molecules B) Antigens C) Human cell markers D) Immunogens