A 65-year-old man with emphysema due to 34 years of cigarette smoking is admitted to hospital due to dyspnea. With further tests the mean pulmonary arterial pressure is determined to be 45 mm Hg at rest. He is hypoxic (PO2 = 49 mm Hg), hypercapnic (85 mm Hg), and slightly acidotic. The cardiovascular and oxygen changes are due to which of the following?

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#Question id: 3038

#Unit 2. Cellular Organization

If a culture starts with 50 cells, how many cells will be present after five generations with no cell death?

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#Question id: 19890

#Unit 12. Applied Biology

QCM is a kind of a piezoelectric biosensor which detects mass change. What is the standard form of QCM biosensor ?

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#Question id: 13216

#Unit 6. System Physiology – Plant

Which statements is INCORRECT about this figure?

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#Question id: 5550

#Unit 5. Developmental Biology

The vertebrate nervous system is derived from

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#Question id: 12251

#Unit 10. Ecological Principles

A plant produces flowers that are open through the day and the night. An experimenter places pollen on the stigmas of freshly opened flowers and covers them after pollination to prevent natural pollinators from having access to the flowers. When experimental pollination was carried out during the day, 40% of the flowers yielded fruit. When experimental pollination was carried out during the night, 80% of the flowers yielded fruit. However, when flowers were  kept  open  to  natural  pollination  during  the  day  (covered  at  night),  35%  of  flowers  produced  fruit.  20%  of flowers exposed to natural pollination during the night (covered during the day) produced fruit. Which of the following statements is NOT a plausible explanation of these results ?