Biology Questions involving DNA

Question

1

What are Prions?

A) Misfolded versions of normal brain protein?

B) Tiny molecules of RNA that infect plants

C) Viral DNA that has had to attach itself to the host genome

D) Viruses that invade bacteria

E) A mobile segment of DNA

#2

A New DNA strand elongates only in the 5' to 3' direction becuase?

A) DNA polymerase begins adding nucleotides at the 5' end of the template

B) Okazaki fragments prevent elongation in the 3' to 5' direction

C) The polarity of the DNA molecule prevents addition of nucleotides at the 3' end

D) DNA polymerase can only add nucleotides to the free 3' end

Answer 1

1)A

2)A