BSE or 'Mad Cow Disease' are probably caused by Prions. Prions may be classified as:
A. Protozoa
B. Viruses
C. Genetic material particles (DNA)
D. Bacteria
E. Proteinaceous material
Ans: E. Proteinaceous material
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Strolling in the Sonoran Desert, you come upon a stately Saguaro cactus. The large central "trunks" of this cactus are covered with numerous smaller spines
The central stalks are modified _________ used for water storage and spines are modified ______ used for protection. A) stems; leaves B) leaves; leaves C) petioles; leaf blades D) leaf blades; trichomes E) stems; fruits
Positive and negative transcriptional regulation differ in that:
A. positive regulation requires that a promoter be present; it's not necessary in negative regulation. B. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, no such protein is necessary. C. in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, such binding prevents transcription. D. in positive regulation, the absence of a regulatory protein promotes transcription; in negative regulation, the absence of a regulatory protein promotes transcription. E. None of these choices is correct.
Antibodies
A. can target the immunogen for destruction. B. can bind to an immunogen. C. are part of the nonspecific immune response. D. both can bind to an immunogen and can target the immunogen for destruction. E. both can bind to an immunogen and are part of the nonspecific immune response.
Which of the following deliver oxygen-poor
blood to the right atrium?
a. vena cavae b. pulmonary artery c. pulmonary vein d. aorta e. left atrium