The cells that line the human respiratory passageways secrete
A) water. B) blood. C) hormones. D) mucus. E) enzymes.
D
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Skeletal muscle cell development is controlled by _______ proteins
A. homeobox B. basic domain C. Hox D. myogenic bHLH
High levels of cortisol can mimic the effects of _____ on the _____
a. insulin; liver b. TSH; thyroid c. insulin; muscles d. glucagon; liver e. glucagon; cells
What are plasmids?
A) Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria B) Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria C) Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria D) Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria
How would Earth be different without photosynthesis?
A. The amount of oxygen in the atmosphere would be lower. B. Heterotrophs would have few food sources. C. Autotrophs would reply on other chemical mechanisms to make carbohydrates. D. More sunlight would be absorbed and converted to environmental heat. E. All answers are correct.