Assume That a Series of Compounds Has Been Discovered in Neurospora.Compounds

question 24

Multiple Choice

Assume that a series of compounds has been discovered in Neurospora.Compounds A-F appear to be members of an enzyme pathway.Several mutations have been identified and each of strains 1-4 contains a single mutation.Shown below are five possible pathways.Choose the pathway that best fits the data presented.[Growth in minimal media with supplements is shown by (+) ,no growth is shown by (o) .] $\begin{array}{|c|c|c|c|c|c|c|}\hline\text { strain }&A&B&C&D&E&F\\\hline 1& \text { o } & \text { o } & \text { o } &+ & + & + \\\hline 2& \text { o } & \text { o } & \text { o } &\text { o } & + & + \\\hline 3& \mathrm{o} & \text { o } & \text { o } & \text { o } & + &\text { o } \\\hline 4& \text { o } &\text { o } & + & + & + & + \\\hline\end{array}$

• A) A ? B ? C ? D ? E ? F
• B) A ? B ? C ? F ? D ? E
• C) F ? B ? C ? D ? A ? E
• D) A ? B ? C ? D ? F ? E
• E) A ? B ? F ? E ? C ? D

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Definitions:

Guanine

One of the four main nucleobases found in the nucleic acids DNA and RNA.

Sex Chromosome Pattern

The configuration of sex chromosomes (XX for females, XY for males) that determines an individual's genetic sex.

Females

The sex of an organism, or a part of an organism, that produces non-motile ova (egg cells) and can typically bear offspring.

Ghrelin

A hormone produced in the stomach that stimulates appetite and signals the brain to increase food intake.