Which of the following can serve as an energy source and as structural support in plant cells?
A) Nucleic acids B) Lipids C) Carbohydrates D) Proteins
C
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When bound to ligand, this type of receptor changes conformation to allow ions to move down their concentration gradient across the membrane:
A. Channel-linked receptor B. Enzymatic receptor C. G protein-coupled receptor D. Steroid hormone receptor
You expect to find the lowest overall blood pressure in
A. humans. B. sparrows. C. alligators. D. ostrich. E. salmon.
A student measuring the pH of the water in a fish tank found it to have a pH of 8. Which one of the following statements is TRUE regarding that solution?
A) The water is alkaline. B) The water does not contain hydrogen ions. C) The water contains equal numbers of hydrogen ions and hydroxyl ions. D) The water is highly acidic. E) The water is more alkaline than a solution with a pH of 10.
Which term refers to groups of cells that share a common structure and function?
a. organ systems b. organs c. tissues d. colonies