Question

1) Which of the following is FALSE regarding nucleotides?

Select one:

a. They polymerize by linking the bases together

b. An example is dUDP

c. They contain a purine or pyrimidine

d. A nitrogenous base is bound to a sugar molecule which is bound to a phosphate group

e. They are the monomeric subunits of nucleic acids

2) Which of the following would not follow the base pair rules between DNA (left) and RNA (right)?

Select one:

a. T::A

b. A::T

c. G::C

d. C::G

Answer 1

1) answer:

a. FALSE : because they donot polymerize by linking the bases. The bond between the phosphate group of one nucleotide and the sugar of another neighbouring nucleotide causes the polymerization of nucleotide. the bond between bases leads to the formation of double helix.

b. false : dUDP is not a nucleotide. it consists of a pyrimidine which is 2'-deoxyribonucleoside 5'-diphosphate and also a deoxyurid phosphate.

c. true : all the nucleotide contain a purine ( adenine and guanine) or a pyrimidine ( cytosine , thymine in DNA andand ura in RNA)

d. true: the nitrogenous base is bound to the sugar group ( at the first carbon) and the sugar group is also bound to the phosphate group(at the 4th carbon). that means both the phosphate group and the base is attached to the sugar.

e. true: nucleic acids are made up of nucleotides. for example DNA is a deoxyribonucleic acid which is made up of nucleotide monomers ( having bases adenine, thymine, guanine, cytosine )

2.

a. follows the base pair rule ; because on the DNA side it is thymine ( pyrimidine ) and on RNA side it is adenine ( purine) and the bond is a double bond which exists between A and T

b. does not follow the base pair rule ; because on the RNA side the base is thymine, which is does not present in RNA. in RNA uracil is present instead of thymine.

c. does not follow basepair rule ; because the bond between the guanine and cytosine is given as a double bond. The actual bond between G and C is a triple bond.

d. does not follow the basepair rule; beacuse the bond between C and G is given as a double bond. Actual bond between the C and G is a triple bond.