Failure of thymus development may result in
A) type I diabetes.
B) Grave's disease.
C) Bruton-type agammaglobulinemia.
D) DiGeorge syndrome.
E) chronic granulomatous disease.
D
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Karl von Frisch demonstrated that European honeybees communicate the location of a distant food source by _____
A) performing a short, straight run during a waggle dance B) performing a long, straight run during a waggle dance C) performing a round dance with fast rotations D) emanating minute amounts of stimulus pheromone E) varying wing vibration frequency
Both Streptococcus pyogenes and Corynebacterium diphtheriae are highly pathogenic, and the disease symptomology can be very severe. Why is this?
A. They induce autoimmune states in the patients. B. There are no antibiotics useful for diseases caused by these bacteria. C. Infants and children are the high-risk groups, and their mortality rate is higher than for other ages. D. Both bacteria produce potent exotoxins.
Oxidation-reduction reactions
Oxidation and reduction reactions are typically linked within a cell. They are part of most matter and energy transformations necessary for vital life functions. A. are not used by living cells. B. transfer protons from one molecule to another. C. reduce the amount of oxygen in the cell. D. transfer electrons from one molecule to another. E. increase the amount of oxygen in the cell.
The most important receptors for steady touch are
a. Pacinian corpuscles. b. Meissner's corpuscles. c. Merkel's discs. d. Ruffini endings. e. free nerve ending.