Which one of the following statements is incorrect about the properties of DNA?
DNA is a double helix.
Adenine pairs with Thymine, and Guanine pairs with Cytosine.
DNA has a sugar-phosphate backbone.
DNA is always linear.
Related Questions
Histones are rich in the basic amino acid residues like?
Lysine
Methionine
Arginine
Both 1 and 3
A nucleoside is
Purine/pyrimidine+phosphate
Purine/pyrimidine+sugar
Pyrimidine+purine+phosphate
Purine+sugar+phosphate
The diameter of Z-DNA is
34Å
20Å
18Å
45Å
Out of A-T, G-C pairing, bases of DNA may exist in alternate valency state owing to arrangements called
Tautomerisational mutation
Analogue substitution
Point mutation
Frameshift mutation
In a DNA, percentage of thymine is what is the percentage of guanine?
Read the following statements
In a dsB-DNA, the rise per base pair would be 34 A, while pitch of DNA would be 3.4 A.
Blood concentration of glucose in a normal healthy individual is 4.2 to 6.1 mmol/L.
The difference in average energy content of substrate from that of stable transition state is called activation energy.
Haem is the prosthetic group and is a part of the active site of catalase.
How many of the given statements are correct?
1
2
3
4
Which of the following nitrogenous bases is NOT found in DNA?
Adenine
Guanine
Cytosine
Uracil
Statements
I. The four nucleotide bases are not necessarily present in DNA in exact equal
proportions.
II. The total amount of purines are equal to the total amount of pyrimidines.
III. DNA ligase enzyme act to hydrolyse or breakdown a polynucleotide chain into
its component nucleotides.
IV. Nuclease enzymes are capable of restoring an intact DNA duplex.
Of the above statements
II is correct, but I, III and IV are wrong
I and II are wrong but III and IV are correct
I, II and III are correct but IV is wrong
I and II are correct but III and IV are wrong
Number of carbons in ring of deoxyribose sugar is
Four
Five
Six
Three
A nucleoside differs from a nucleotide it lacks the?
Nitrogen base
Sugar
OH group
Phosphate group
