What is the probability of flipping a penny and a nickel and obtaining one head and one tail?
What will be an ideal response?
1/2 (apply the "sum law")
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Viruses transmit bacterial genetic material from one bacterium to another in a type of horizontal gene transfer referred to as ____
Fill in the blank with the appropriate word.
Microorganisms in the human colon are more often being described as mutualistic with human hosts rather than commensalistic. Why has this change in the definition of a symbiotic relationship occurred?
A. As we learn more about the ecology of the human microbiome, we have learned that these organisms are dependent on the nutrients that we provide for their survival. B. As we learn more about the ecology of the human microbiome, we recognize our dependence on these organisms for immunity, vitamin production, and other essential processes. C. As we learn more about the makeup of the human digestive tract, we realize that some microorganisms are potentially pathogenic while others are not. D. All of the choices are correct.
If a mother is a carrier for color-blindness and her husband is not color-blind, what are the probable genotypes of the children?
A. one normal daughter, one carrier daughter, one normal son, and one color-blind son B. two carrier daughters, one normal son, and one color-blind son C. one normal daughter, one carrier daughter, and two normal sons D. two normal daughters, one normal son, and one color-blind son E. one normal daughter, one carrier daughter, and two color-blind sons
Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth. b. Senescence results in increased hormone secretion. c. Postnatal development occurs before birth. d. In general, boys experience their pre-adolescent growth spurt later than girls. e. Early childhood is a time of rapid cell division in nerve cells.