Question

if you have 5% adenine, how much guanine would you have?
25
5
45
50
which is the first enzyme in the replication process?
dna polymerase
ligase
helicase
topermorase

Explanation:

First Question (Adenine and Guanine Percentage)

Step1: Recall Base Pairing Rule

In DNA, Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C). So, the percentage of A equals T, and G equals C.

Step2: Calculate Total of A + T

Given A = 5%, so T is also 5%. Thus, A + T = 5% + 5% = 10%.

Step3: Calculate G + C

The total percentage of all bases is 100%. So, G + C = 100% - (A + T) = 100% - 10% = 90%.

Step4: Find Percentage of G

Since G = C, we divide G + C by 2. So, G = $\frac{90\%}{2}$ = 45%.

In DNA replication, the first step is unwinding the double helix. Helicase is the enzyme that breaks the hydrogen bonds between base pairs to separate the two strands, initiating replication. DNA polymerase synthesizes new strands later, ligase seals gaps, and topoisomerase relieves supercoiling (but not the first step).

Answer:

45

Second Question (First Enzyme in Replication)