Final answer:
The RAS mutation frequency in endometrial cancer is 20-30%. A species with 27% adenine in its DNA will have 23% cytosine. The complementary DNA sequence to AATGCTAC is TACGATGT.
Step-by-step explanation:
The frequency of RAS mutation in endometrial cancer is approximately 20-30% . RAS genes are among the most commonly mutated oncogenes in human cancers. When it comes to the DNA content of a species with 27% adenine (A), one would expect an equal percentage of thymine (T) due to base pairing rules, and thus the percentage of cytosine (C) would also be equal to guanine (G). Hence, if adenine is 27%, cytosine will be 23%, since DNA has equal amounts of purines (A and G) and pyrimidines (C and T), and the total of all four nucleotides adds up to 100%. Regarding the complementary DNA sequence, if the original 5' to 3' strand is AATGCTAC, the complementary sequence will read TACGATGT. in the 3' to 5' direction.