Which of the following has not contributed to declines in the world fish catch in recent years?
A) use of aquaculture aquafarming
B) water pollution
C) herbicide and pesticide use
D) depletion of fish populations through overfishing
E) new technologies that increase fishing efficiency
Ans: A) use of aquaculture aquafarming
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Isolates from an ear swab that are gram-negative coccobacilli grow on chocolate agar in CO2 but not blood agar, require both X and V factors for growth, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. H. ducreyi. c. H. aphrophilus. d. H. influenzae.
Which step of the nitrogen cycle is not performed by most bacteria?
a. ammonification b. denitrification c. assimilation d. nitrogen fixation e. nitrification
Which of these factors will limit the size of a population?
A. availability of food and energy B. disposal of waste C. interaction with other organisms D. All of these answers are correct.
Consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have?
A. 600 B. 165 C. 217 D. 468