The efficiency of energy transfer between trophic-levels averages about
A. 33%.
B. 10%.
C. 1%.
D. 25%.
E. 0.1%.
Answer: B
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Plasmids can carry genes that are useful to the host bacteria. These genes encode proteins that can extend the range of environments that can be exploited by the bacteria. Which of the following would be a benefit to the host bacteria?
A. a plasmid that confers sensitivity to antibiotics B. a plasmid that protects the bacteria from the host animal's immune response C. a plasmid that encodes an agent that facilitates tissue colonization D. a plasmid that confers antibiotic sensitivity and protects against a host's immune response E. a plasmid that protects against a host's immune response and facilitates tissue colonization
The combined effects of inhibitory and excitatory effects on a postsynaptic cell will decide whether that cell generates an action potential. This principle is called ________
A) threshold B) internalization C) summation D) potentiation
Where do eggs mature and get released from?
A) oviduct B) uterus C) vagina D) follicle
Transovarian transmission is a process in which
A. a pathogen infects the ovaries of the host. B. a pathogen is transmitted to the host when the host ingests contaminated eggs. C. an infected female vector transmits the pathogen to the eggs forming in its ovaries. D. the pathogen is transmitted from an infected male to a healthy female during mating. E. the pathogen is spread from one host to the next by unprotected sexual intercourse.