Cleavage of the cyclobutane ring of pyrimidine dimers by ______________ restores the original DNA structure.

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#Question id: 807

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following forces can stabilize a normal DNA double-helix?

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#Question id: 4901

#Unit 8. Inheritance Biology

Assume that the alleles A (dominant) and a (recessive) show a maternal effect mode of inheritance. In a cross between an Aa female and an aa male, what would be the phenotypes of the progeny?

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#Question id: 16121

#Unit 7. System Physiology – Animal

 Match the following mechanisms (Column I) with their correct example (Column II).

Column I	Column II
A. Heat-generating and heat-retaining mechanisms	i. increased metabolic rate (thyroid hormones, sympathetic nervous system)
B. Heat-dissipating mechanisms	ii. vasodilation of blood vessels of the skin (decreased sympathetic tone)
	iii. increased activity of sympathetic cholinergic fibers to sweat glands.
	iv. shivering
	v. vasoconstriction of blood vessels of the skin (increased sympathetic tone)

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#Question id: 8959

#Unit 9. Diversity of Life Forms

The most ancient branch point in animal phylogeny is that between having

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#Question id: 1291

#Unit 4. Cell Communication and Cell Signaling

Which of the following is NOT true regarding matrix metalloproteases?