Which cellular component of blood helps in clotting?
A) red blood cells
B) white blood cells
C) plasma
D) platelets
D
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You're treating a patient who is abnormally short and find normal blood levels of growth hormone. Based on this evidence, what can you determine about the patient?
A) The patient has a tumor in the pituitary gland. B) The patient lacks a functional pituitary gland. C) The patient lacks receptors for growth hormone. D) The patient lacks a functional circulatory system.
Which structure of a flower traps pollen?
A) style B) stigma C) ovary D) filament
Which term refers to the process in which an environmental stimulus triggers a response that compensates for changes in the internal/external environment?
a. physiological feedback b. positive feedback c. negative feedback d. anatomical feedback
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?