Which statement is not true about an α-helix?

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#Question id: 9233

#Unit 9. Diversity of Life Forms

What is the biggest problem with selecting a site for a reserve?

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#Question id: 10991

#Unit 7. System Physiology – Animal

When recording lead I on an EKG, the right arm is the negative electrode, and the positive electrode is the

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#Question id: 23258

#Unit 13. Methods in Biology

If the probes are hybridized at the ends of the chromosome then they are called as

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#Question id: 9178

#Unit 9. Diversity of Life Forms

A fish swimming into an estuary from a river would have which of the following as its greatest physiological challenge?

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#Question id: 14685

#Unit 4. Cell Communication and Cell Signaling

In dark-adapted rod cells, a high level of cGMP keeps cGMP-gated nonselective cation channels open, leading to hyperpolarization of the plasma membrane and neurotransmitter release. 

B - Light absorption generates activated rhodopsin, R*, which binds inactive, GDP-bound Gαt protein and mediates the exchange of GDP for GTP . 

C- The free Gαt∙GTP activates PDE by binding to its inhibitory γ subunits and dissociating them from the catalytic α and β subunits . Relieved of their inhibition, the α and β subunits of PDE hydrolyze GMP to cGMP . 

D- The resulting decrease in cytosolic cGMP leads to dissociation of cGMP from the cation channels in the plasma membrane and the closing of those channels . 

E- The membrane then becomes transiently hyperpolarized, and neurotransmitter release is reduced.