Final answer:
Based on the given information, 1) Restriction Enzyme A recognizes a 6-base pair sequence and 2) Restriction Enzyme B recognizes a 4-base pair sequence. Hence, 1) and 2) are correct.
Step-by-step explanation:
Based on the information given, we can infer that Restriction Enzyme A recognizes a 6-base pair sequence and Restriction Enzyme B recognizes a 4-base pair sequence.
Restriction Enzyme A has the recognition sequence 5'CTGCAG3'. Since it contains 6 nucleotides, we can conclude that it recognizes a 6-base pair sequence.
Restriction Enzyme B has the recognition sequence 5'GCGC3'. This sequence contains 4 nucleotides, indicating that it recognizes a 4-base pair sequence.