Tris-BP was banned after the discovery that the chemical caused cancer in test animals and was
____________________ through the ____________________ by those wearing treated clothing. Fill in the blank(s) with the appropriate word(s).
absorbed; skin
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Female fireflies identify males by their flashing patterns, which are often so complicated that signals sent by one
species cannot be understood by another species. This reproductive isolating mechanism is called ____.v
a. ecological isolation b. gametic isolation c. temporal isolation d. behavioral isolation e. mechanical isolation
While it is very difficult to find fossils of the earliest cells, there are some probable early cell characteristics. Four of the five answers represent possible traits that the first cells may have had. Select the exception:
a. prokaryotic b. autotroph c. aerobic d. anerobic e. hetrotroph
Bacteria causes acne by infecting the
1.epidermis. 2.ducts of sweat glands. 3.hair follicles. 4.subcutaneous tissue. 5.ducts of oil glands.
Photons excite electrons in chlorophyll. These electrons are then trapped by the primary electron acceptor. How does the photosystem replace the trapped electrons?
a) The photosystem replaces its light-excited electrons by extracting electrons from oxygen. b) These electrons are not replaced. A molecule of chlorophyll in a photosystem is used up with each electron transferred. c) The photosystem replaces its light-excited electrons by extracting electrons from water. d) The photosystem replaces its light-excited electrons by extracting electrons from carbon dioxide. e) These electrons are not replaced. There are hundreds of millions of free electrons available in the photosystem at any particular time.