In a Bad Late-Night Science Fiction Film, a Villain Is

question 1

Multiple Choice

In a bad late-night science fiction film, a villain is using a large collection of rare radioactive atoms as energy for a weapon to threaten the good guys. The atoms have a half-life of 1 hour. The villain has 4 kilograms of the radioactive material now, and he needs a minimum of 1 kg. for his weapon to work. After how much time will the weapon no longer be a threat?

• A) just a little after 1 hr
• B) just a little after 2 hrs
• C) just a little after 4 hours
• D) just a little after 16 hours
• E) can't be determined from the information given

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Definitions:

Antigenic Determinant

Specific part of an antigen that stimulates an immune system response by binding to receptors on the surface of lymphocytes; also called epitope.

Cell-mediated Immunity

A type of immunity where T cells directly attack infected or cancerous cells, as opposed to producing antibodies.

Polypeptide Chains

are long chains of amino acids linked by peptide bonds, forming the primary structure of proteins.

T and B Cells

Types of lymphocytes involved in the immune response; T cells assist in immune response regulation, while B cells produce antibodies.