At the Isoelectric PH of a Tetrapeptide

question 89

Multiple Choice

At the isoelectric pH of a tetrapeptide:

• A) only the amino and carboxyl termini contribute charge.
• B) the amino and carboxyl termini are not charged.
• C) the total net charge is zero.
• D) there are four ionic charges.
• E) two internal amino acids of the tetrapeptide cannot have ionizable R groups.

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Definitions:

Variable Cost

Variable costs are expenses that vary directly with the level of production or sales volume, such as raw materials and packaging.

Fixed Cost

Expenses that do not change in proportion to the level of goods or services produced by a business.

Contribution Format

An income statement format that separates fixed and variable costs and expenses, used to determine contribution margin.

Least-squares Method

A statistical technique used to determine the line of best fit by minimizing the sum of the squares of the differences between the observed values and the values predicted by the line.