You Are Interested in Examining the Psf Gene $\quad$ $\quad$

question 18

Multiple Choice

You are interested in examining the Psf gene.It is known that Psf is normally produced when cells are exposed to high levels of both calcium (Ca²⁺) and magnesium (Mg²⁺) .MetA, MetB, and MetC are important for binding to the promoter of the Psf gene and are involved in regulating its transcription.MetA binds to the "A" site in the promoter region, MetB to the "B" site, and MetC to the "C" site.You create binding-site mutations in the A, B, and C sites and observe what happens to transcription of the Psf gene.Your results are summarized in Table 8-12. $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\underline{\text { Transcription in the presence of } \mathrm{Ca}^{2+} \text { and/or } \mathrm{Mg}^{2+}}$
$\begin{array}{lcccc}\text { Binding sites present } & \begin{array}{l}\text { No } \mathrm{Ca}^{2+} \\\text { or } \mathrm{Mg}^{2+}\end{array} & \begin{array}{l}\text { With } \\\mathrm{Ca}^{2+}\end{array} & \begin{array}{l}\text { With } \\\mathrm{Mg}^{2+}\end{array} & \begin{array}{l}\text { With } \mathrm{Ca}^{2+} \\\text { and } \mathrm{Mg}^{2 *}\end{array} \\\hline \text { A, B, and C } & - & - & - & ++ \\\hline \text { none } & - & - & - & - \\\hline \text { A only } & - & - & + & + \\\hline \text { B only } & - & - & - & - \\\hline \text { C only } & - & + & - & + \\\hline \text { A and B only } & - & - & - & + \\\hline \text { A and C only } & - & + & + & ++ \\\hline \text { B and C only } & - & - & - & +\end{array}$

$\text {For this table: -= no transcription of Pst,}$
$\text {\( += \) low level of transcription of Psf, and}$
$\text {\( ++= \) high levels of transcription of Pst.}$

Table 8-12
Which transcription regulator(s) are normally bound to the Psf promoter in the presence of Mg²⁺ only?

• A)none
• B)MetA only
• C)MetA and Met B
• D)MetA, MetB, and MetC

Identify factors that influence a nation's decision to specialize in the production of certain goods.

Analyze the impact of specialization and trade on a nation's production and consumption.

Recognize the role of tariffs, quotas, and non-tariff barriers in international trade.

Understand the effect of trade barriers on prices and quantities in the domestic market.

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Definitions:

Psychologically Disordered

Referring to a pattern of behavioral or psychological symptoms that impact multiple areas of life and create distress for the person affected.

Bias

A tendency to lean in a certain direction, often to the detriment of an open mind; in statistics, a systematic error introduced into sampling or testing.

Bipolar Disorder

A mood disorder in which the person alternates between the hopelessness and lethargy of depression and the overexcited state of mania. Formerly called manic-depressive disorder.

Anxiety Disorder

A category of mental health disorders characterized by significant and persistent fear, anxiety, or avoidance behaviors.