When Scientists Described the Sequences of the Proteins of Haemophilus

question 236

Multiple Choice

When scientists described the sequences of the proteins of Haemophilus influenzae based on its DNA sequence, what did they find to be the major difference between noninfective strains and highly infective strains?

• A) The infective strains have genes for glycolysis that the noninfective strains lack.
• B) The noninfective strains lack the enzymes needed to synthesize amino acids.
• C) Only the infective strains have surface proteins that attach the bacterium to respiratory tracts.
• D) The noninfective strains lack open reading frames.
• E) The strains have different regulatory sequences.

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Definitions:

Partial Reinforcement

A type of learning in which a behavior is reinforced only a portion of the time it occurs, known to increase resistance to extinction.

Non-Contingent Reinforcement

A form of reinforcement where rewards are given at fixed or variable intervals independent of the recipient's behavior.

Classical Conditioning

The act of learning that happens when two stimuli are paired together repeatedly, and a reaction initially caused by the second stimulus starts to be triggered by the first stimulus exclusively.

Discriminative Stimulus

A cue or event that indicates that a particular response will lead to a certain consequence in operant conditioning.