nucleotides and DNA

DNA consists of 2 antiparallel, complementary polynucleotide chains. Its monomers are called

(a)  

The nitrogenous bases in DNA can NOT be called

• thymine

• uracil

• adenine

• cytosine

What is the pair of cytosine

• adenine

• thymine

• uracil

• guanine

How many hydrogen bonds are between adenine and thymine?

• 1

• 2

• 3

• none

Which is a purine base?

• thymine

• uracil

• adenine

• cytosine

Draw a ribose molecule

What type of bond connects nucleotides in a polynucleotide chain?

• ionic

• hydrogen

• covalent

• phosphodiester

What can NOT be the role of DNA?

• It contains the genes

• It is the hereditary material

• It is part of the ribosomes, the organelles which produce proteins

• It is found in mitochondria and chloroplasts where it works as a blueprint for protein production

You have different type of DNA so different genes in different organs e.g. in the cells of your eye and in your muscle cells. That is why they behave differently.

• Yes

• No

• It depends on the organ, sometimes yes sometimes not.