During a precipitation test, what happens if there is an excess of antibody?
a. precipitation occurs only if the test tube is shaken
b. precipitation occurs, but only after several hours
c. precipitation happens immediately
d. immune complexes are small and soluble, thus no precipitation occurs
Answer: d. immune complexes are small and soluble, thus no precipitation occurs
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Organisms that have their optimum growth pH between 8.5 and 11.5 are called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about cell signaling is correct?
A. Signaling pathways and the molecules involved (e.g., kinases) evolved before the evolutionary split between plants and animals and thus are similar in the two groups. B. Molecular mechanisms for communication between cells occurs in complex multicellular organisms, but not single-celled eukaryotes. C. All animals have gap junctions to allow for targeted signaling between cells. D. Signaling molecules are generally polysaccharides that activate receptors on target cells and activate or repress gene expression. E. Only cells on the exterior surface of an organism have receptors to detect environmental signals.
One of your closest fish relatives is the coelacanth. Where is its equivalent to your forearm?
A. The claspers B. The pectoral fin lobe C. The operculum D. The gill arch extensions E. The pelvic fin lobe Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the coelacanths? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A typical eukaryotic cell that has an abundant supply of glucose and O2 will generate a proton gradient in its
mitochondria by ____ that is used primarily for ____.
a. chemiosmosis; substrate-level phosphorylation b. the electron transport chain; chemiosmosis c. the electron transport chain; substrate-level phosphorylation d. fermentation; NAD reduction e. glycolysis; production of CO2