Which of the following statements regarding animal digestive systems is false?
A) We expect that an herbivore will have a longer alimentary canal than a carnivore of similar body size.
B) Meat is more difficult to digest than vegetable matter because of its protein content.
C) Many herbivorous animals have cellulose-digesting microbes in their colon and cecum.
D) When cows chew their cud, it helps to soften and break down plant fibers, making these more accessible to digestion by microbes.
Answer: B
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Why is there a new reliance on metagenomics to find new organisms that may produce a medically or industrially important product?
A. So far, only about 10% of useful microbes have been grown in the laboratory. B. We do not have the techniques for growing most microbes found in nature. C. Soils contain so many potential sources of microbes producing antibiotics it would take more than a century to screen them all. D. All of these argue for the need to use metagenomics to identify new useful microbial products.
Both mitochondria and chloroplasts are thought to have evolved by the process of ____
a. endosymbiosis b. viral reassortment
c. transformation d. decomposition e. nitrogen fixation
Blood glucose levels are regulated by
a. insulin. b. glucagon. c. cortisol. d. insulin and glucagon only. e. insulin, glucagon, and cortisol.
What is a zoonosis?
A. A disease caused by normal human microbiota from the respiratory tract B. A disease caused by changes in the balance between normal microbiota C. A disease that spreads naturally from animals to humans D. A disease caused by normal microbiota entering a body site where they do not normally occur