1) What is the complementary strand of the DNA sequence GCAAT?
a) GGCTT
b) CGTTA
c) CGTAT
d) GCUUA
its B
To find the complementary strand of a DNA sequence, you need to remember the base pairing rules. In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).
Given the DNA sequence GCAAT, we can find the complementary strand by replacing each base with its complementary base-pair. Therefore, the complementary strand for GCAAT would be:
G (Guanine) pairs with C (Cytosine)
C (Cytosine) pairs with G (Guanine)
A (Adenine) pairs with T (Thymine)
A (Adenine) pairs with T (Thymine)
T (Thymine) pairs with A (Adenine)
Therefore, the complementary strand of the DNA sequence GCAAT is CGTTA.
So, the correct answer is b) CGTTA.