Use the Following Information to Answer the Question

question 41

Multiple Choice

Use the following information to answer the question.
The mechanism of cell crawling in protist species is not well defined. Pseudopodia extension involves interactions between actin and myosin (the same molecules that are involved in vertebrate muscle contraction) . However, prior to the study described below, no one had provided convincing data that actin and myosin were actually involved in cell crawling in protists. Anatomical studies had identified the cytoskeletal protein actin just below the surface of the cell membrane in several species of protist, but physiological studies had failed to show a functional link between actin, myosin, and cell crawling.
In a study by N. Poulsen et al. (Diatom gliding is the result of an actin-myosin motility system, Cell Motility and the Cytoskeleton 44 (1999) :23-22) , researchers tested whether motility in a particular species of diatom involves interactions between actin and myosin.

Refer to the study by Poulsen et al. and the figure above. Cultures of a species of diatom were treated with BDM, a reversible inhibitor of myosin function. Which of the following predictions is consistent with the hypothesis that an actin-myosin interaction is necessary for motility?

• A) BDM will significantly decrease motility of the cells in culture.
• B) BDM will not significantly alter motility of the cells in culture.
• C) BDM will significantly increase motility of the cells in culture.
• D) BDM will significantly increase motility of the cells in their natural habitats.

Comprehend the inflation rate calculation and its significance.

Recognize the factors causing inflation (cost-push and demand-pull).

Gain knowledge about historical inflation trends and their causes.

Differentiate between the effects of inflation on different economic agents (borrowers, lenders, workers, etc.).

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Definitions:

Average Cost

The cost per unit of output, represented by dividing the total production cost by the quantity of units produced.

Marginal Cost

The rise in overall expenses associated with the production of an extra unit of a good or service.

Marginal Revenue

Marginal revenue is the additional income that is gained from selling one more unit of a product or service.

Price Searcher

A firm that determines the price of its products with some degree of market power, usually by differentiating its products from those of competitors.