How Does X-Ray Crystallography Provide Details About Molecular Structure

question 65

Multiple Choice

How does x-ray crystallography provide details about molecular structure?  

• A)Only DNA molecules scatter x-rays; therefore, this helped to prove that DNA was the genetic material in cells.
• B)X-rays are reflected by some atoms and absorbed by others; thereby giving clues to molecule structure.
• C)X-rays are scattered by atoms in a specific pattern, from which molecular size, shape, and spacing of repeating elements can be calculated.
• D)This technique captures photographs of magnified molecules.
• E)X-rays can be used to isolate DNA molecules from living organisms.

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Definitions:

Present Value

The current worth of a future sum of money or stream of cash flows given a specified rate of return.

Future Value

Value of cash flows at a future date, taking into account interest accumulated between when the cash flow occurred and the future date.

Double-Declining Balance

An accelerated method of depreciation that doubles the rate at which an asset’s book value declines compared to straight-line depreciation.

Straight-Line Depreciation

A method of allocating the cost of an asset evenly over its useful life.