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Use the Following Information to Answer the Question

question 77

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. The data graphed in the figure could be an artifact if latrunculin A kills this species of diatoms (that is, that may be why the cells are not moving) . Which of the following would be the best evidence that latrunculin A is not killing the cells?

Definitions:

Compounded

The process by which an investment grows over time as earnings are reinvested to generate additional earnings, known as compound interest.

Interest Payment

The amount paid by a borrower to a lender as compensation for the use of borrowed money, often expressed as a percentage of the principal.

Interest Rate

The lending charge, expressed as a fraction of the original amount, that a borrower is assessed by a lender for asset use.

Annuity Due

A type of annuity payment where payments are made at the beginning of each period, as opposed to the end.