Figure 29.3 Use the Following Information When Answering the Corresponding Question(s)

question 31

Multiple Choice

Figure 29.3
Use the following information when answering the corresponding question(s) .
The mechanism of cell crawling in protist species is not well defined.The textbook states that pseudopodia extension involves interactions between actin and myosin (the same molecules that are involved in mammalian 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 Figure 29.3.Latrunculin A is a reversible toxin that disrupts the formation of actin fibers.A culture of a particular species of diatom was treated with this toxin diluted in a buffer,while another culture was treated only with the buffer (no toxin;control) .The motility of cells in each culture was assessed by counting the number of cells that were moving during a defined period of time.Which of the following conclusion statements is reasonable based on the above figure?

• A)Formation of actin fibers is not necessary for the movement in this species of diatom.
• B)The buffer alone largely inhibited movement in this species of diatom.
• C)In this species of diatom,fully formed actin fibers are necessary for movement.

Understand the basic roles of government in promoting economic growth and stability.

Identify the factors influencing the decisions of policymakers to promote growth in living standards.

Comprehend the impact of health, education, and nutrition on long-run economic growth.

Recognize the relationship between population growth and education levels.

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Definitions:

Fiscal Year

The one-year period a company or government uses for accounting purposes and preparing financial statements.

Operating Cycle

The process by which a company spends cash, generates revenues, and receives cash either at the time the revenues are generated or later by collecting an accounts receivable.

Federal Government

The national government of a country, which holds the primary authority over the nation and implements laws, policies, and regulations across the entire country.

Adjusted Trial Balance

A financial statement that lists all accounts and their balances after adjustments have been made.