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27. Which three of the researchers listed below received theNobel Prize for discoveries related
double helix DNA structures:
a. Francis Crick, James Watson and Rosalind Franklin
b. James Watson, Rosalind Franklin, and Maurice Wilkins
c. Maurice Wilkins, Rosalind Franklin and Francis Crick
d. James Watson, Francis Crick, and Maurice Wilkins

28. Each nucleotide of a DNA molecule consists of:
a. Phosphate groups, pentose sugar and heterocyclic nitrogenbases
b. Phosphate groups, hexose sugars and heterocyclic nitrogenbases
c. Phosphate groups, pentose sugar and oxygen bases
d. Phosphate groups and hexose sugars
e. Hexose sugar and heterocyclic nitrogen base

29. The strand complementary to the DNA strand 5'-TACGATCATAT-3'is as follows:
a. 3'-TACGATCATAT-5 '
b. 3'-ATGCTAGTATA-5 '
c. AUGCUAGUAUA 3'-5 '
d. 3'-GCATATACGCG-5 '
e. 3'-TATACTAGCAT-5 '

26. The significant difference between prokaryotes andeukaryotes is as follows:
a. Prokaryotic DNA floats freely in the cell, while eukaryotic DNAis located in
cell nuclei
b. Prokaryotes do not have DNA, as genetic material, whileeukaryotes have
c. Prokaryotes do not have ribosomes, while eukaryotes do
d. Prokaryotic cells are not membrane-bound, whereas eukaryoticones are
e. The correct answers are a, b and c

21. The technique used by Rosalind Franklin in detecting thestructure of a DNA molecule is as follows:
a. Spectroscopy
b. X-ray crystallography
c. Spinning
d. NMR technique
e. Electrophoresis

22. A point mutation that replaces the codon of a specific AKwith a stop codon is called:
a. Wrong mutation
b. Meaningless mutation
c. Silent mutation
d. Mutation of reading frame change
e. None of the above

23. Frameshift mutation is:
a. Replacing one AK with another
b. Insertion of a single nucleotide into the chain
c. Removal of multiple nucleotides from the chain
d. Binding of two different proteins
e. The correct b and c is the answer

24. Depurination:
a. A very rare mutation
b. Removal of thymine base from the chain
c. Removal of adenine base from the chain
d. Removing the uracil base from the chain
e. All answers are correct

25. The significant difference between prokaryotes andeukaryotes is as follows:
a. Prokaryotes do not have DNA, as genetic material, whileeukaryotes have
b. Prokaryotes do not have ribosomes, while eukaryotes have
c. Prokaryotic cells are not membrane-bound, whereas eukaryoticones are
d. Eukaryotic DNA floats freely in the cell, while prokaryotic DNAis located in the cell nucleus
e. Nothing is true

20. Why are histones a highly conserved protein?

a. Because they are closely related to the regulation ofreplication
b. Because they are necessary for replication
c. Because they play an important role in the packaging of DNA inthe nucleus
d. Therefore, they are required for the transfer of plasmids fromone cell to another
e. The correct answers are a, b and c