Use the Following Information When Answering the Corresponding Questions)

question 22

Multiple Choice

Use the following information when answering the corresponding questions) .
Shuichi Nakano reported in Science in February 2000 that, "The RNA enzyme ribozyme) from hepatitis delta virus catalyzes self- cleavage of a . . . [chemical] . . . bond." This reaction is inherently slow due to the formation of an unfavorable negative charge on the ribozyme. The author goes on to show that this self- cleavage is made faster by joining it with an acid- base reaction that neutralizes the negative charge. Nakano's model describes a positively charged cytosine base on the ribozyme acting as the acid, and magnesium hydroxide acting as the base. Specifically, the cytosine donates its proton H+) to neutralize the unstable negative charge that would have formed on the ribozyme.
-Is Nakano's quote consistent with the textbook's claim that RNA is a good candidate for the first life- form?

• A) yes
• B) no

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Definitions:

Matrix Limitation

Constraints related to a matrix structure in mathematics or computing, including dimensions, storage, or computational complexity.

Outputs

The results or actions produced by a computer system, electronic device, or process, following processing or operation.

Rung

A level or step in a ladder diagram, which is a traditional representation of a circuit or network in PLC programming, consisting of conditions leading to one or more outputs.

Nesting

The practice of placing one control structure within another, such as loops or conditional statements in programming.