Which option would be the LEAST effective initial line of defense against pathogens?
A. Lysosomes in the fluid bathing the eye
B. Thick mucus coating the trachea
C. Thin, unkeratinized skin of a salamander
D. Exoskeleton of a beetle
E. Strong stomach acid
Answer: C
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Plants perform photosynthesis by using the
energy of ____ to power production of sugars from ____ and ____ molecules.
a. organic molecules; oxygen; water b. organic molecules; carbon dioxide; water c. sunlight; carbon dioxide and oxygen; water d. sunlight; oxygen; water e. sunlight; carbon dioxide; water
The colonial flagellate hypothesis states that animals descended from a hollow spherical colony of flagellated cells. Place the probable steps in the order which this would occur.
A. Step 3 B. Step 4 C. Step 1 D. Step 2
Allergies are hypersensitivities to substances that ordinarily would do no harm to the body.
Answer the following statement true (T) or false (F)
Populations of amphibians, including frogs and toads, have been plagued by disease and high rates of deformity. A recent study investigated whether problems among the populations have arisen due to poisons from chemicals associated with agriculture. Biologists from the University of Florida collected local adult cane toads (Bufo marinus) from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar in color to females and had lower levels of testosterone and often also deformed gonads. These changes can lead to sterile males or changes in behavior that
prevent mating from occurring. In this study, what is the genus of the study animal? What will be an ideal response?