Figure 38.2 -The IRT1 Gene Is Responsible for Most of the Iron

question 7

Multiple Choice

Figure 38.2

-The IRT1 gene is responsible for most of the iron uptake activity in roots (Vert et al. ,Plant Cell 14 [2002]:
1223-33) .To determine the specificity of the IRT1 transporter in Arabidopsis plants,researchers measured the concentration of manganese,zinc,copper,and cobalt contained in wild-type and irt1-1 mutant plants.What conclusions about IRT1 specificity can you draw from the above data?

• A)Under iron-deficient conditions,IRT1 is highly specific for Fe.
• B)Under iron-deficient conditions,IRT1 is important for the transport of iron and copper.
• C)IRT1 is important for the transport of iron and copper independent of iron concentration.
• D)Under iron-deficient conditions,IRT1 is necessary for the transport of iron,zinc,manganese,and cobalt.
• E)IRT1 participates in the transport of iron,zinc,manganese,and cobalt independent of iron concentration.

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Definitions:

Nonrival

A good or service that can be consumed by one individual without preventing the consumption of the good by another individual.

Nonexcludable

A characteristic of a public good, indicating that it is not feasible to prevent non-paying customers from consuming the good.

Excludable

An excludable good is one from which it is possible to prevent people from benefiting unless they have paid for it.

Public Good

A good or service offered to every member of a society for free, provided by either the government or a private entity or group, without seeking profit.