Question

What is the common between histone proteins and spermiding?

1.)histones and spermidine are present only in bacteria.

2.)histones are spermidine are negatively charged

3.) histones are spermiding help DNA attain a random coil conformation

4.) they both play a role in DNA packaging

Which of the following factors makes hydrolysis of acetyl coA a favorable process?

1.)separation of like charges

2.)increased delocalization of the pi-cloud

3.)enol-keto tautomerication

4.) change of non-aromatic structure to aromatic structure

The amino acid responsible for introducing kinks in DNA helical structure by intercalation is

1.) Proline

2.) Phenylalanine

3.) ethidium bromide

4.) trytophan

During gylcolysis the addition of a new phosphate group on to a substrate can be catalyzed by which classes of enzymes?

1.) mutase and isomerase

2.) kinase and transferase

3.)kinase and phosphorylase

4.) phosphorylase and mutase

Answer 1

1. Answer: Option 4 is correct
Explanation:
Histones and spermidines are positively charged.
They help in DNA packaging.
Histones are found exclusively in eukaryotes.

2. Answer: Option 3 is correct
Explanation:
Acetyl CoA is a major intermediate in energy metabolism.
The hydrolysis of the thioester bond is favored by the keto-enol tautomerization

3. Answer: Option 1 is correct
Explanation:
The amino acid responsible for introducing kinks in DNA helical structure by intercalation is Proline
Proline is an imino acid

4. Answer: Option 2 is correct
Explanation:
Glucose + ATP ------> Glucose-6-phosphate + ADP (This reaction is catalyzed by Hexokinase)
Fructose-6-phosphate + ATP ------> Fructose-1, 6-bisphosphate + ADP ((This reaction is catalyzed by Phosphofructokinase)
Both are transferases