Which of the Following Is Not True

question 70

Multiple Choice

Which of the following is not true?

• A) A single activating enzyme can interact with all the tRNAs for its corresponding amino acid
• B) The selectivity of the aminoacyl-tRNA synthetases for their tRNA molecules is often called the second genetic code
• C) There are two major classes of aminoacyl-tRNA synthetases
• D) aminoacyl-tRNA synthetases link amino acids to tRNA molecules without the need for an energy source

---

Definitions:

Observer Drift

A phenomenon in which there are gradual changes in the way an observer measures or perceives phenomena over time, leading to inconsistencies.

Reactivity

The change in behaviour often seen when people know they are being observed or filmed. One of the difficulties inherent in in vivo observation and analogue observational settings.

External Validity

The extent to which the results of a study can be generalized to other situations and to other people.

Quasi-Experiment

A research design that lacks the full control of true experimental designs but employs some method of making causal inferences from observed changes.