Most GTPases Are Present Inside the Cell at a Much

question 28

Multiple Choice

Most GTPases are present inside the cell at a much higher concentration than their upstream GAP and GEF proteins. Imagine a mutation in a certain GTPase, such as a Rab protein, resulting in an extremely tight binding between the GTPase and its GEF, and a very slow dissociation. What would you expect to happen in the cell as a result?

• A) Rab proteins will be activated, because the tightly bound GEFs will be unavailable.
• B) Rab proteins will be inactivated, because the tightly bound GEFs will be unavailable.
• C) Rab proteins will be activated, because the Rab-GAPs will become activated.
• D) Rab proteins will be inactivated, because their GAPs will become activated.
• E) Rab proteins will be activated, because there are fewer GAPs available.

Understand the diversity of fungal forms and their classification.

Identify the role of fungi in ecosystem nutrient cycles and plant growth.

Distinguish between different types of fungal reproduction and their genetic implications.

Recognize the importance of fungi in mutualistic and parasitic relationships.

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Definitions:

Budget Variance

The difference between the budgeted or baseline amount of expense or revenue, and the actual amount.

Insurance Rates

The cost per unit of coverage set by insurance companies, determining the premium paid by policyholders.

Volume Variance

The difference between the expected volume of sales or production and the actual volume, which affects budgeting and operational planning.

Fixed Manufacturing Overhead

Fixed manufacturing overhead refers to the costs associated with production that do not vary with the level of output, such as rent for factory buildings, salaries of certain staff, and equipment depreciation.