Q. 17.105 - An Introduction to General, Organic, and Biological Chemistry

Question

Write the complementary base sequence for each of the following DNA segments: 

a. $\mathrm{G} \mathrm{A} \mathrm{C} \mathrm{T} \mathrm{T} \mathrm{A} \mathrm{G} \mathrm{G} \mathrm{C}$
b. $\mathrm{T} \mathrm{G} \mathrm{C} \mathrm{A} \mathrm{A} \mathrm{A} \mathrm{C} \mathrm{T} \mathrm{A} \mathrm{G} \mathrm{C} \mathrm{T}$
c. $\mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G}$

Step-by-Step Solution

Answer

Part(a) The complementary base sequence are  $\mathrm{C} \mathrm{T} \mathrm{G} \mathrm{A} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{C} \mathrm{G}$
Part(b) The complementary base sequence are $\mathrm{A} \mathrm{C} \mathrm{G} \mathrm{T} \mathrm{T} \mathrm{T} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A}$

Part(c) The complementary base sequence are   $\mathrm{T} \mathrm{A} \mathrm{G} \mathrm{C} \mathrm{T} \mathrm{A} \mathrm{G} \mathrm{T} \mathrm{T} \mathrm{A} \mathrm{C} \mathrm{C}$

Part(a) Step 1 : Given information

We need to find the complementary base sequence for $G A C T T A G G C$

Part(a) Step 2 : Simplify

The complementary bases are $\mathrm{G}=\mathrm{C}, \mathrm{A}=\mathrm{T}$

Therefore the complementary base sequence for DNA segments is $\mathrm{C} \mathrm{T} \mathrm{G} \mathrm{A} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{C} \mathrm{G}$

Part(b) Step 1 : Given information

We need to find the complementary base sequence for $\mathrm{T} \mathrm{G} \mathrm{C} \mathrm{A} \mathrm{A} \mathrm{A} \mathrm{C} \mathrm{T} \mathrm{A} \mathrm{G} \mathrm{C} \mathrm{T}$

Part(b) Step 2 : Simplify

The complementary bases are $\mathrm{G}=\mathrm{C}, \mathrm{A}=\mathrm{T}$

Therefore the complementary base sequence for DNA segments is $\mathrm{A} \mathrm{C} \mathrm{G} \mathrm{T} \mathrm{T} \mathrm{T} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A}$

Part(c) Step 1 : Given information

We need to find the complementary base sequence for $\mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G} \mathrm{A} \mathrm{T} \mathrm{C} \mathrm{G}$

Part(c) Step 2 : Simplify

The complementary bases are $\mathrm{G}=\mathrm{C}, \mathrm{A}=\mathrm{T}$

Therefore the complementary base sequence for DNA segments is $\mathrm{T} \mathrm{A} \mathrm{G} \mathrm{C} \mathrm{T} \mathrm{A} \mathrm{G} \mathrm{T} \mathrm{T} \mathrm{A} \mathrm{C} \mathrm{C}$