Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic.
B. the cow, like the rabbit, ingests its feces.
C. cows can manufacture all 20 amino acids out of sugars in the liver.
D. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose.
E. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
E. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
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Organisms whose sole source of carbon for growth is CO2 are called ________.
A. autotrophs B. consumers C. saprophytes D. lithotrophs E. decomposers
Which of the following best describes the number of distinct evolutionary branches in the domain
Archaea, as revealed by genome sequencing studies?
a. 3?4 b. 6?7 c. 9?10 d. at least 12 e. at least 20
Miller's reaction chamber contained gases intended to simulate the atmosphere of the ancient Earth. Which gas was
NOT included in this chamber? a. carbon dioxide b. methane c. ammonia d. water vapor e. hydrogen gas
Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus B. The cowpox infection will have no effect on the child's immunity to the small pox virus. C. The cowpox virus prevented the small pox virus from entering the child's immune system. D. The cowpox infection will prevent the child from being infected by the small pox virus.