Question 1 :
Which one of the following is the complementary sequence for the DNA with $5'$-CGTACTA-$3'$.

Question 2 :
In a dsDNA number of phosphodiester bonds are $3250$, then find the number of base pairs.

Question 5 :
The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimdines in this segment ?<span></span>

Question 6 :
According to Watson-Crick model, hydrogen bonding in a double-stranded DNA occurs between.

Question 9 :
In the double helix model of DNA, what would be the distance between two consecutive base pairs?

Question 11 :
Which of the following biologists has been dubbed as the architect of molecular biology?

Question 13 :
What is the length of human DNA containing $6.6\times10^9$ bp nitrogen bases?

Question 16 :
Which one of the following combinations is found in DNA ?

Question 18 :
Watson and Crick were awarded Nobel Prize for their finding of

Question 20 :
The two strands of double helix of DNA are linked together by hydrogen bonds between

Question 22 :
Assertion: The sugar phosphate backbone of two chains in DNA double helix show anti-parallel polarity. Reason: The phosphodiester bonds in one strand go from a 3 carbon of one nucleotide to a 5 carbon of adjacent nucleotide, whereas those in complementary strand go vice versa.

Question 26 :
How many among the following organisms hve linear ds DNA as their genetic material?<br>Homo sapiens, Escherichia coil, Drosophila, $\phi \times 174$ bacteriophage

Question 28 :
Watson and Crick shared the Nobel Prize for DNA structure with

Question 29 :
Match the following and choose the correct combination from the options given.<div><br/><table class="wysiwyg-table"><tbody><tr><td></td><td>Column-I</td><td></td><td>Column-II</td></tr><tr><td>A.</td><td>Walter Sutton</td><td>1.</td><td>Discovered penicillin</td></tr><tr><td>B.</td><td>Thomas Hunt Morgan</td><td>2.</td><td>Discovered the chromosomal basis of heredity</td></tr><tr><td>C.</td><td>James Watson</td><td>3.</td><td>Described the phenomenon of linkage and crossing over</td></tr><tr><td>D.</td><td>Alexander Fleming</td><td>4.</td><td>Discovered the double helical structure of DNA</td></tr></tbody></table></div>

Question 30 :
Double helix model of DNA which was proposed by Watson and Crick was of<br/>

Question 31 :
<span>In the Watson and Crick model of DNA, the steps of the ladder are composed of</span>

Question 33 :
Choose the correct answers from the alternatives given :<span><br>Which of the following regarding DNA is not true?</span>

Question 35 :
DNA in the nucleus of rabbit egg is 1.8 picograms, its liver cell will have mass of DNA ______ picograms.

Question 36 :
Assertion: DNA is associated with proteins. Reason: DNA binds around histone proteins that form a pool and the entire structure is called as a nucleosome.

Question 39 :
If the length of DNA strand is $ { 68A }^{ \circ }$ then, what will be the number of nucleotides present in DNA molecule

Question 40 :
Which can be observed in an interphase nucleus under the light microscope?

Question 41 :
A $340\overset {\circ}{A}$ long segment of DNA molecule has $20$ thymine nitrogenous bases, what will be the number of guanine nitrogen bases in the same segment?

Question 42 :
Which of the following does not confer stability to the helical structure of DNA?

Question 43 :
&#34;It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for genetic material&#34; - This is written by<br/>

Question 44 :
Which of the following is not relevant to the structure of double helical DNA?