Which of these are made at sites of tissue damage, where they cause inflammation and pain as part of the healing process?
A) Protein receptors
B) Prostaglandins
C) Nitric oxide
D) Gap junctions
E) Neurotransmitters
B
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The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements?
A) PSI precedes PSII in photosynthesis. B) Electrons are excited by PSI or PSII, but not both. C) Chlorophyll molecules in the reaction centers of PSI and PSII are designated P700 and P680, respectively, to reflect the wavelengths of their light absorption maxima. D) PSII was discovered before PSI. E) Only PSI contains a special pair of chlorophyll a molecules.
Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen isotopes. B. oxygen ions. C. oxygen isomers. D. oxygen dimers.
Which of the following statements concerning the metabolic degradation of glucose (C6H12O6) to carbon dioxide (CO2) and water is (are) true?
A) The breakdown of glucose to carbon dioxide and water is exergonic. B) The breakdown of glucose to carbon dioxide and water has a free energy change of -686 kcal/mol. C) The breakdown of glucose to carbon dioxide and water involves oxidation-reduction or redox reactions. D) Only A and B are correct. E) A, B, and C are correct.
If a microbiology lab student left the safranin out of the Gram stain procedure, what would be the result?
A) All cells would be purple. B) Gram-positive cells would be purple and Gram-negative cells would be colorless. C) All cells would be pink. D) Gram-positive cells would be pink and Gram-negative cells would be purple. E) Gram-positive cells would be colorless and Gram-negative cells would be pink.