Cows are able to survive on a diet consisting almost entirely of cellulose because

A. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
B. cows are autotrophic.
C. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose.
D. cows can manufacture all 20 amino acids out of sugars in the liver.


Answer: A

Biology & Microbiology

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Fill in the blank(s) with correct word

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Describe two ways in which the respiratory and circulatory systems have been modified in mammals that dive to great depths

What will be an ideal response?

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The amount of life that an ecosystem can support is determined primarily by the

A) number of producers and their efficiency. B) number of heterotrophs. C) efficiency of the consumers. D) number of chemoautotrophs. E) efficiency of the heterotrophs.

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Which of the following statements about the cells of the mucous membrane lining air tubes of humans is false?

A) They manufacture secretory products. B) They are stratified squamous epithelial cells. C) They are cuboidal or columnar in shape. D) They have cilia that collect and transport mucus up and out of the respiratory system.

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