Which of the following hedgehog (Hh) proteins promotes spermatogenesis?

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#Question id: 27131

#Unit 7. System Physiology – Animal

A 40-year-old woman comes to her primary care physician complaining of nervousness and an unexplained weight loss of 20 pounds over the past 3 months despite her impression that  she is eating all the time. On physical examination, her eyes are  found to be protruding, her skin is moist and warm, and her fingers have a slight tremor. Compared to a normal individual, a biopsy of her thyroid gland would most likely reveal which of the following:

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#Question id: 32238

#Unit 2. Cellular Organization

Resident ER membrane proteins contain retrieval signals, called:

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#Question id: 192

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the role of the magnesium ion in kinases that require the magnesium-ATP complex to donate phosphoryl groups?

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#Question id: 12933

#Unit 13. Methods in Biology

Choose the correct order for the cloning process.

1. The production of cDNA is carried out using an enzyme termed Reverse transcriptase.

2. mRNA cannot be used directly in cloning.

3. It is possible to synthesis complementary DNA molecule to all the mRNA from the selected tissue.

4. The cDNA may be inserted into vectors and then cloned.

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#Question id: 4574

#Unit 11. Evolution and Behavior

Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are