How Did the Scientists Determine If an Organic Molecule Was

question 41

Multiple Choice

How did the scientists determine if an organic molecule was extraterrestrial?

• A)By looking for a decrease in ¹³C and ¹⁵N in the meteorite
• B)By measuring the amount of amino acids in the meteorite
• C)By measuring the amount of nucleotides in the meteorite
• D)By looking for an increase in ¹³C and ¹⁵N in the meteorite
• E)By measuring the total amount of carbon and nitrogen in the meteorite

---

Definitions:

Just Noticeable Difference

The minimum difference in stimulation that a person can detect 50% of the time.

Absolute Threshold

The minimum intensity of a stimulus that one can detect 50% of the time, a concept central to the study of sensory processes.

Taste Constancy

The perception that the flavor of a food item remains consistent despite changes in the environment or context.

Proximal Stimulus

The stimulus registered by the sensory receptors, e.g., the pattern of light falling on the retina, as opposed to the actual object in the environment.