Restriction endonucleases are

The restriction enzyme $EcoRI$ cuts the $DNA$ strand between $G$ and $A$ bases only when the sequence is:

EcoRI is

Refer to the following statements for agarose-gel electrophoresis :
$(a)$ Agarose is a natural polymer obtained from sea-weed.
$(b)$ The separation of $DNA$ molecules in agarose-gel electrophoresis depends on the size of $DNA$.
$(c)$ The $DNA$ migrates from negatively-charged electrode to the positively-charged electrode.
$(d)$ The $DNA$ migrates from positively-charged electrode to the negatively-charged electrode.
Choose the most appropriate answer from the options given below :

Which of the following statements is correct regarding the $DNA$ polymerase used in $PCR$?

How many of the following restriction enzymes produce blunt ends?
$EcoRI, Hind III, Bam HI, EcoR V, Hind II$