Double Helical Structure of DNA

Q.

What are the examples of Nucleic acids?

Q.

Glucose is converted into starch by the process called_________.

1. Glucogenesis

2. Polymerisation

3. Active transport

4. Glycolysis

Q.

DNA nucleotide is composed of ..............

1. Ribose sugar, phosphate group, nitrogenous base

2. Deoxy ribose sugar, nitrate group, nitrogenous group

3. Ribose sugar, carbonate group, nitrogenous base

4. Deoxyribose sugar, phosphate group, nitrogenous base

Q.

What is the meaning of polarity of DNA?

1. DNA is positively charged on one end and negatively charged on others.

2. One strand of DNA is positively charged while other is negatively charged.

3. DNA has two distrinct ends, one is called 3' -end and other 5' -end.

4. None of the above

Q.

Which of the following biomolecules does have a phosphodiester bond?

1. Nucleic acids in a nucleotide

2. Amino acids in a polypeptide

3. Monosaccharides in a polysaccharide

4. Fatty acids in a diglyceride

Q.

What is the role of nucleic acids in the synthesis of proteins?

Q. If a length of DNA has 45, 000 base pairs, how many complete turns will the DNA molecule take?

1. 4500
2. 45
3. 450
4. 45000

Q.

What is the importance of DNA?

Q.

Which bonds are formed by DNA ligase?

Q. Purines are nitrogenous bases with ring(s) in their structure while pyrimidines have ring(s) in their structure.

1. one
2. two
3. three
4. four
5. five
6. six

Q.

What DNA is present in humans?

Q. The double helical structure of DNA was proposed by ___________.

1. Anton van Leeuwenhoek
2. Schleiden and Schwann
3. Alexander Fleming
4. Watson and Crick

Q. Diameter of DNA is constant due to

1. Hydrogen bonds between base pairs
2. Phosphodiester bonds
3. Disulphide bonds
4. Covalent bonds

Q. A is a unit of DNA that is made up of one sugar molecule, one phosphate molecule, and one

1. nucleosome
2. nucleotide
3. nitrogenous base
4. amino acid
5. lipid

Q. Why are proteins important inDNA?

Q.

Is prokaryotic DNA supercoiled?

Q.

What enzymes does trypsin activate?

Q.

Purine derivative among the following bases is?

1. Guanine

2. Cytosine

3. Uracil

4. Thymine

Q. In the DNA molecule:

1. the proportion of adenine in relation to thymine varies with the organism
2. the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
3. there are two strands which run antiparallel one in 5' $\to$ 3' direction and other in 3' $\to$ 5'
4. there are two strands which run parallel in the 5' $\to$ 3' direction

Q.

The approximate uniform distance between two strands of B-DNA is

1. 34 Angstrom

2. 18 Angstrom

3. 36 Angstrom

4. 20 Angstrom

Q.

Who first identified DNA as an acidic substance in the nucleus?

Q.

In a DNA double helix, the nucleotides of one strand are linked together by

1. Hydrogen bonds

2. Glycosidic bonds

3. Phosphodiester bonds

4. Peptide bonds

Q.

Where does chymotrypsin take action?

Q.

What is a histone octamer?

Q.

Which of the following is not relevant to the structure of double helical DNA?

1. Each strand of helix has a backbone made up of alternating ribose sugar and phosphate

2. The helix makes one complete spiral turn every 34$\stackrel{\circ }{A}$

3. The diameter of the helix is 20 $\stackrel{\circ }{A}$

4. \N

5. The two adjacent sugar molecules are joined with phosphate by phosphodiester bond

Q.

DNA is made up of repeating sequences of molecules called

1. Genes

2. Alleles

3. Nitrogenous bases

4. Nucleotides

Q. The structural unit formed by tight coiling of DNA around the histone octamer is called the .

1. nucleoid
2. nucleosome
3. nuclein
4. nucleolus

Q.

Hereditary information is indicated by_________.

1. sequence of nucleic acid

2. position of nucleic acid

3. number of nucleic acid

4. none of these

Q.

What are ATC and G in DNA?

Q.

Does everyone have unique DNA?