Question

1.

This type of bond is used to link monomers of nucleic acids together

Select one:

Peptide

Ionic

Hydrogen

Glycosidic

Phosphodiester

2.

Which is true of DNA polymerase?

Select one:

One of its functions is to uncoil the double stranded DNA

It hooks nucleotides together in a 5' to 3' direction

It does not recognize RNA primers, thus controlling replication

It hooks nucelotides together in any direction

It does not make Okazaki fragments

3.

Chargaff's contribution to the identification of DNA structure was:

Select one:

discovery of phosphodiester bonds in DNA

determining the size of the DNA molecule

investigating the injection of DNA into bacteria by viruses

determining the direction of DNA replication

providing evidence of complementary base pairing

Answer 1

1 answer - phosphodiester bond.

​Phosphodiester bond is found in the backbone of DNA. Nucleotides are monomers of DNA which are attached with each other with the help of phosphodiester bond.

2. Answer - Option B ( hook nucleotides in 5' to 3' direction)

DNA polymerase is an important enzyme of DNA replication. This is used in the proceeding of new strand in 5'-3' direction always, not in any direction. This is also used in okazaki fragments. Unwinding is not the function of polymerase.

3. Answer- option D (providing evidences of complementary base pairing)

Chargaff stated the rule that adenine always binds with thymine whereas guanine binds with cytosine. So base pairing between complementary sequences was given by Chargaff.

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