Grains Represent Radioactive Material Within the Replicating Eye

question 73

Multiple Choice

Grains represent radioactive material within the replicating eye.
-In an experiment,DNA is allowed to replicate in an environment with all necessary enzymes,dATP,dCTP,dGTP,and radioactively labeled dTTP (³H thymidine) for several minutes and then switched to nonradioactive medium.It is then viewed by electron microscopy and autoradiography.The figure above represents the results.
Which of the following is the most likely interpretation?

• A)There are two replication forks going in opposite directions.
• B)Thymidine is only being added where the DNA strands are furthest apart.
• C)Thymidine is only added at the very beginning of replication.
• D)Replication proceeds in one direction only.
• E)Thymidine is not being incorporated into the DNA, but is associating with the DNA due to hydrogen bonding.

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Definitions:

Joint Tenants

Joint Tenants is a term used in real estate to describe a form of co-ownership where all owners hold an equal share of the property, and have a right of survivorship, meaning upon the death of one tenant, the property's ownership transfers to the surviving tenant(s).

Sever the Joint Tenancy

The legal process of converting a joint tenancy into a tenancy in common, thus allowing the owners to own a property in equal or unequal shares.

Option Agreement

A subsidiary contract creating an obligation to hold an offer open for acceptance until the expiration of a specified time.

Lease

A secured arrangement whereby possession of the goods goes to the lessee, while the title to the goods remains with the lessor.