The Individual(s) Who Used Ball and Stick Models to Identify

question 38

Multiple Choice

The individual(s) who used ball and stick models to identify the three-dimensional structure of proteins was ________.

• A) Franklin
• B) Watson and Crick
• C) Hershey and Chase
• D) Pauling
• E) Chargaff

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Definitions:

Pretest-Posttest

A research design that measures the effect of an intervention by comparing conditions before and after the intervention is applied.

Posttest-Only

A research design where measures are taken only after the experimental manipulation, without a pretest comparison.

Mortality

The loss of subjects who decide to leave an experiment. Mortality is a threat to internal validity when the mortality rate is related to the nature of the experimental manipulation.

Experimental Design

A research design used to test hypotheses and establish cause-effect relationships by manipulating one or more independent variables and observing the effect on dependent variables.