You have information about a particle that contains 7 protons, 8 neutrons, and 8 electrons. Which of the following statements would be true?
A) It is an ion. B) It has an atomic number of 15.
C) It has an atomic weight of 23. D) It has 8 electrons in its outermost shell.
Answer: A
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What is another name for the polymers of carbohydrates?
A. Triglycerides B. Nucleotides C. Polypeptides D. Polysaccharides
In many cells, the adhesion to the extracellular matrix through integrins causes the activation of kinases in the cytoplasm. This suggests that:
A. integrins promote the activation of signaltransduction pathways. B. integrins are kinases. C. extracellular matrix proteins are receptors and integrins are ligands.
What respiratory structure produces sound?
a. Pharynx b. Nasal cavity c. Trachea d. Epiglottis e. Larynx
Which of the following stages of an infectious disease is the most severe?
A) the incubation period B) the prodromal period C) the illness period D) the decline period E) the convalescence period