A Hospital Patient Has Been Given Some (Half-Life =

question 25

Multiple Choice

A hospital patient has been given some (half-life = 8.04 d) which decays at 4.2 times the acceptable level for exposure to the general public.How long must the patient wait for the decay rate to reach the acceptable level? Assume that the material merely decays and is not excreted by the body.

• A) 17 d
• B) 12 d
• C) 8.0 d
• D) 7.2 d

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Definitions:

X Chromosome Inactivation

A process by which one of the copies of the X chromosome present in female mammals is inactivated, ensuring that males and females have the same dose of the X chromosome genes.

X Chromosome Inactivation Center (XIC)

A critical region on the X chromosome that controls the process of X chromosome inactivation during female development.

Codominance

A genetic scenario where two alleles of a gene pair in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Phenotypes

The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.