Substrates used by methanogens include H2 and CO2 as well as short-chain organic compounds such as ________.
A. acetate
B. formate
C. methanol
D. All of the choices are correct.
Answer: D
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Indicate whether the statement is true or false
Leptospirosis is often contracted
A. by eating infected animals. B. by eating contaminated vegetables. C. from contaminated animal urine. D. by the respiratory route.
Which part of a bird's digestive system contains sand and rocks to aid in mechanical digestion?
a. crop b. esophagus c. gizzard d. pharynx e. proventriculus
Assuming three genes are linked, how many recombinant genotypes would you expect and at what frequency?
A) two recombinant genotypes, more frequent than expected by independent assortment B) four recombinant genotypes, more frequent than expected by independent assortment C) six recombinant genotypes, more frequent than expected by independent assortment D) four recombinant genotypes, less frequent than expected by independent assortment E) six recombinant genotypes, less frequent than expected by independent assortment