What is a likely explanation for a high ratio of forced expiratory volume to forced vital capacity?
a. pneumonia-reduced lung capacity
b. asthma-induced exhalation resistance
c. lung inflexibility due to lung fibrosis
d. increase tidal volume due to aerobic exercise
c. lung inflexibility due to lung fibrosis
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Destruction of which biome would result in the greatest loss of biodiversity?
A. desert B. grassland C. savanna D. taiga forest E. tropical rain forest
Which of the following sequences would be cleaved by a type II restriction endonuclease?
A) TTGCCGA AACGGCT B) GGGGGGG CCCCCCCC C) GTAATG CATTAC D) GAATTC CTTAAG
Why do obligate symbionts often contain lower G+C content when compared to free-living organisms?
A) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny. B) Free-living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature. C) Replicating high G+C content genomes requires several additional enzymes, to break apart the strong triple bonds formed from GC pairs, which are rarely found in symbionts with relatively small genome sizes. D) Symbionts usually do not have as many DNA repair mechanisms as free-living organisms, and two common spontaneous mutations change GC pairs into AT pairs.
Which one of the following is a glucocorticoid important in both gluconeogenesis (glucose produced from amino acids) during starvation and anti-inflammation?
A. aldosterone B. cortisol C. glucagon D. insulin E. prolactin