The resistance of the pulmonary tree is so low that a 1 cm of water pressure gradient is sufficient to cause normal air flow during resting conditions. Which of the following often has a substantial resistance during pulmonary disease states that can limit alveolar ventilation?

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#Question id: 5064

#5. Developmental Biology

Fibroblast growth factors, epidermal growth factors, platelet-derived growth factors, and stem cell factor are all paracrine factors that bind to

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#Question id: 3864

#3. Fundamental Processes

RNA polymerase:

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#Question id: 10388

#6. System Physiology – Plant

Phytochrome can interconvert between Pr and Pfr forms, Pr receives red light and converts into Pfr while Pfr receives far-red light and then converts into Pr, so which form of phytochrome is responsible for seed germinations?

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#Question id: 2937

#2. Cellular Organization

Separase initiates sister chromatid segregation at anaphase by cleaving:

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#Question id: 3887

#3. Fundamental Processes

Aptamers are