Different Modification of the Histone Have Different Effects on Gene

question 17

Multiple Choice

Different modification of the histone have different effects on gene expression.For instance,the ninth amino acid of histone 3 is a lysine H3K9) can be acetylated once or methylated up to three times.Which of the following is true regarding H3K9 modification?

• A)If H3K9 has two methyl groups,then the gene will be activated.
• B)If H3K9 has three methyl groups,then the gene will be repressed.
• C)If H3K9 is acetylated,then the gene will be repressed.
• D)If H3K9 has three methyl groups,it is maximally activated compared to only having one methyl group.
• E)If H3K9 has a single methyl group,then the gene will be repressed.

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Definitions:

Sales Volume

The total number of units or products sold within a specific period.

Fixed Expense

Overheads that stay the same, no matter how much is produced or sold, encompassing charges such as property rent, staff paychecks, and insurance coverage costs.

Break-Even

Break-even refers to the point at which total costs and total revenues are exactly equal, resulting in neither profit nor loss.

Variable Expense

Costs that vary directly with the level of production or sales volume, such as raw materials and direct labor costs.