# How many base pair of DNA helix are found in the structure a 1000 B 500 C 200 D 100?

## How many base pair of DNA helix are found in the structure a 1000 B 500 C 200 D 100?

A segment of DNA contains 1200 nucleotides, of which 200 have adenine base. How many cytosine bases are present in this segment of DNA?

What is the ratio of A to T DNA?

Chargaff’s rules state that DNA from any species of any organism should have a 1:1 stoichiometric ratio of purine and pyrimidine bases (i.e., A+G=T+C) and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine.

How many bonds are in A and T?

two hydrogen bonds
Base pairing between adenine and thymine can be found in DNA only. There are two hydrogen bonds holding the two nitrogenous bases together.

### What is the length of Dsdna of 400 base pairs?

136 nm
The optimum length for circularization of DNA is around 400 base pairs (136 nm), with an integral number of turns of the DNA helix, i.e., multiples of 10.4 base pairs.

How many base pairs are in a DNA molecule?

four bases
According to Watson-Crick base-pairing, which forms the basis for the helical configuration of double-stranded DNA, DNA contains four bases: the two purines adenine (A) and guanine (G) and the two pyrimidines cytosine (C) and thymine (T). Within the DNA molecule, A bonds only with T and C bonds only with G.

What percentage of DNA is adenine?

In a DNA sample, the percentage of adenine is 40% and percentage of thymine is 60%.

#### What is A G C T?

ACGT is an acronym for the four types of bases found in a DNA molecule: adenine (A), cytosine (C), guanine (G), and thymine (T). Adenine pairs with thymine, and cytosine pairs with guanine. The sequence of bases in a portion of a DNA molecule, called a gene, carries the instructions needed to assemble a protein.

What is the percent adenine in a DNA molecule containing 24% guanine?

The correct answer: A DNA molecule with 24% guanine would have 26% adenine.

How do you calculate DNA nucleotides?

According to Chargaff rule,

1. Here adenine residues =120, cytosine residues = 120.
2. there fore total number of nucleotides = [A] + [T]+ [C]+[G] =120 X 4 = 480.
3. In humans, there is approximately 30% adenine.
4. According to Chargaff’s rule, [A]+[G]=[C]+[T]
5. Here [A]=30% therefore % of [T] is also 30%.

## Why do only two H bonds form between A and T?

In the DNA helix, the bases: adenine, cytosine, thymine and guanine are each linked with their complementary base by hydrogen bonding. Adenine pairs with thymine with 2 hydrogen bonds. This difference in strength is because of the difference in the number of hydrogen bonds.

How many bonds does guanine and cytosine have?

three hydrogen bonds
It is a truth universally acknowledged that a guanine–cytosine (GC) base pair has three hydrogen bonds whereas adenine–thymine (AT) has two.

How many chains of nucleotides are in a DNA molecule?

A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together (Figure 4-3).

### How many codons are there in 12 nucleotides of DNA?

There would be 4 codons. When RNA is made during the process of transcription, there is one nucleotide in the RNA molecule for every one nucleotide from the template strand of the DNA molecule. So a DNA sequence of 12 nucleotides will produce an RNA sequence which also has 12 nucleotides.

How many turns of DNA are in a DNA double helix?

The DNA double helix. (A) A space-filling model of 1.5 turns of the DNA double helix. Each turn of DNA is made up of 10.4 nucleotide pairs and the center-to-center distance between adjacent nucleotide pairs is 3.4 nm. The coiling of the two strands around (more…)

How many hydrogen bonds are there in a DNA molecule?

Therefore, there must be 200 hydrogen bonds between them. If there are 500 guanines, there are also 500 cytosines because they are complementary and form base pairs. Again, there must be 500 hydrogen bonds holding each guanine to each cytosine. The total amount of hydrogen bonds in this molecule of DNA is 700.