As regards the immune system, older people are more likely to develop
a. common colds.
b. warts.
c. stronger immune responses.
d. an increased risk of AIDS.
e. autoimmune diseases.
E
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Proteins embedded in the nuclear envelope that selectively allow substances to cross into and out of the nucleus form
A. Golgi B. Cytosol C. Endoplasmic Reticulum D. Nuclear Pores E. Nucleus
Where is DNA found in prokaryotes?
a. only in the nucleolus b. only in plasmids c. in the nucleolus and plasmids d. in the nucleoid and plasmids
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. Based on this study, what is the control group? What will be an ideal response?
Organisms from the genus Aspergillus are used in the production of
A. cellulase. B. pectinase. C. proteases. D. amylase. E. All of the choices are correct.