The _______ are a group of enzymes that add nucleotides to a replicating DNA chain.

A permanent alteration in a DNA base sequence is known as a _________.

James Watson and Francis Crick discovered the _______.

The key to DNA replication is that each _______ base on an original strand of DNA serves as a template for the addition of a T base on the new strand, while each _______ on the original strand serves as a template for the addition of a G base.

A particular sequence of DNA _______ can specify a particular _______.

Given the following DNA sequence, determine the complementary strand that would be added in replication:

ATTGCATGATAGCC

James Watson and Francis Crick:

a. proved that DNA contains information for the production of proteins.

b. elucidated the nature of genetic mutations.

c. discovered DNA.

d. proved that chromosomes were made partly of DNA.

e. discovered the structure of DNA.

Would you expect cancer to arise more often in types of cells that divide frequently (such as skin cells) or in types of cells that divide rarely or not at all (such as nerve cells in the brain)? Explain your reasoning.

The type of biological study that was exemplified through the discovery of DNA structure is called:

a. detailed biology.

b. component biology.

c. microscopic biology.

d. elemental biology.

e. molecular biology

If dark matter did not exist it is likely that:
A. the universe would expand forever
B. the universe would begin contracting soon
C. the night sky would be brighter
D. the night sky would be darker
E. we would be able to see the center of the universe

Dark matter is suspected to exist in the universe because:
A. the night sky is dark between stars
B. the orbital period of stars in the outer parts of a galaxy is greater than the orbital period
of stars near the galactic center
C. the orbital period of stars in the outer parts of a galaxy is less than the orbital period of
stars near the galactic center
D. the orbital period of stars in the outer parts of a galaxy is about the same as the orbital
period of stars near the galactic center
E. all galaxies have about the same mass