Which of the Following Secondary Structures Is Correctly Identified

question 28

Multiple Choice

Which of the following secondary structures is correctly identified?

• A)Z-DNA: left-handed DNA with pyrimidines in the syn conformation and purines in the anti conformation
• B)hairpin structure: self-complimentary single stranded molecules that form a parallel helix
• C)cruciform: a double hairpin formed in a region of palindromic DNA
• D)H-DNA: triple helical structure that results when Watson-Crick base pairing does not form and instead, Hoogsteen base pairing occurs
• E)none of the above

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Definitions:

Reinforcer

Any stimulus that strengthens or increases the probability of a specific response or behavior by the means of positive or negative reinforcement.

Frequency

The rate at which something occurs or is repeated over a particular period or in a given sample.

Reinforcement Size

The magnitude or amount of reinforcement provided following a behavior, which can influence the strength and rate of the learned response.

Reinforcer

Any stimulus, which, when presented after a behavior, increases the likelihood of that behavior being repeated.