The length of DNA has 45000 base pairs. How many complete turns will the DNA molecule take?

(1) 45000            

(2) 450                

(3) 4500               

(4) 45

Go through the following facts:
I. 'AAG' always code for lysine. It cannot code for any other amino acid.
II. Serine amino acid can be coded by UCU / UCC / UCA or UCG.
III. UUU form phenylalanine in bacteria as well as human beings.
IV. UUU GGG CCC AAA Me codes for five amino acids.
Now point out nature of genetic code after reading above:
(1) 1 – Specificity / Non-ambiguity of code; II - Universality of code; III - Degeneracy of code; IV - Triplet and non-overlapping code

(2) I – Specificity / Non-ambiguity of code; II - Degeneracy of code; III - Universality of code; IV - Triplet and non-overlapping code

(3) 1 – Specificity / Non-ambiguity of code; II - Degeneracy of code; III - Universality of code; IV - Triplet and overlapping code

(4) 1 – Specificity / Non-ambiguity of code; II - Universality of code; III - Degeneracy of code; IV - Triplet and overlapping code

The full form of ELSI is:

(1) Embedded Low Software Index    

(2) Ear Lung Spleen Immunity

(3) Ethical Legal and Social Issue      

(4) Endonuclease Ligase Surface Immunity

DNA fingerprinting works because:
(1) Genes containing the same alleles make it simple to compare different individuals

(2) PCR allows amplification of proteins from single cells

(3) There are multiple alleles for some DNA sequences, making it possible to obtain unique patterns for each individual

(4) DNA in the skin cells is very diverse

DNA replication in eukaryotes differs from replication in bacteria because:
(1) Synthesis of the new DNA strand is from 3' to 5' in eukaryotes and from 5' to 3' in bacteria

(2) Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and from 3' to 5' in bacteria

(3) There are many replication forks in each eukaryotic chromosome and only one in bacterial DNA

(4) Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and is random in prokaryotes

Mutations are:
(1) Heritable changes in the sequence of DNA bases that produce an observable phenotype

(2) Heritable changes in the sequence of DNA bases

(3) Mistakes in the incorporation of amino acids into proteins

(4) Heritable changes in the mRNA of an organism

You have analyzed the DNA isolated from a newly discovered virus and found that its base composition is 32% A, 17% C, 32% G, and 19% T. What would be a reasonable explanation of this observation?
(1) The virus must be extraterrestrial

(2) In some viruses, double-stranded DNA is made up of base pairs containing two purines or two pyrimidines

(3) Some of the T was converted to C during the isolation procedure

(4) The genome of the phage is single-stranded not double-stranded

The energy necessary for making a DNA molecule comes directly from the:

(1) Sugar                                          

(2) ATP

(3) Release of phosphates                   

(4) NADPH

The force that holds DNA together in a double helix is:

(1) The force of the twist                   

(2) Covalent bonds

(3) Ionic bonds or ionic interactions   

(4) Hydrogen bonds

The enzyme that unwind the DNA prior to replication is called:

(1) DNA polymerase III                      

(2) DNA ligase

(3) Primase                                       

(4) Helicase