Practice Test 8

A model shows that gene changes can affect proteins.

Before → After model:

Gene (before): P Q R S → Protein (before): folds into Shape 1 and sends a signal

Gene (after): P Q T S → Protein (after): folds into Shape 2 and sends a weaker signal

Which prediction about protein function is supported if the gene changes again from P Q T S to P Q U S?

A student is checking a classmate’s model. The model is meant to show that gene changes can affect proteins.

Classmate’s model:

Gene (before): H J K → Protein (before): works

Gene (after): H J K (same) → Protein (after): completely different shape and does not work

Which evaluation is best, using cause–effect reasoning and evidence?