In areas of permafrost, stands of black spruce are frequently observed in the landscape, while other tree species are noticeably absent. Often these stands are referred to as "drunken forests" because many of the black spruce often "lean over" (that is, they are displaced from their normal vertical alignment). What is the most likely explanation for the unusual growth of these forests in this marginal habitat?

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#Question id: 5844

#Unit 8. Inheritance Biology

In homologous genetic recombination, RecA protein is involved in:

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#Question id: 341

#Unit 1. Molecules and their Interaction Relevant to Biology

 Which force can stabilize a DNA double-helix?

TLS Online TPP Program

#Question id: 1070

#Unit 4. Cell Communication and Cell Signaling

Genetic exchange in segmented viruses that allows a zoonotic virus to infect humans is termed

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#Question id: 12513

#Unit 7. System Physiology – Animal

A 26-year-old construction worker is brought to the emergency room with a change in mental status after working a 10-hour shift on a hot summer day (average outside temperature was 97°F). The man had been sweating profusely during the day but did not drink fluids. He has a fever of 102°F, heart rate of 140 beats/min, and blood pressure of 100/55 mm Hg in the supine position. On examination, he has no perspiration, appears to have dry mucous membranes, and is poorly oriented to person, place, and time. Assuming that his kidneys were normal yesterday, which of the following sets of hormone levels describes his condition, compared with normal?

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#Question id: 1649

#Unit 4. Cell Communication and Cell Signaling

Which of the following gene clusters do NOT contribute to antigen binding?