Transduction
A) is the direct transfer of DNA from one bacterium to another.
B) occurs when a bacterium acquires DNA from the surrounding environment.
C) occurs when a phage transfers bacterial DNA from one bacterium to another.
D) requires DNA polymerase.
Answer: C
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Old pine stumps are dug up, split into pieces and sold as "fatwood". Fatwood is used as a fire starter. Why is this done?
A. The wood in the stumps is porous and dry, thus it burns easily. B. The high concentration of volatile organic compounds makes the wood flammable. C. Pine bark does not absorb water and is flammable. Clarify Question What is the key concept addressed by the question? Gather Content What do you already know about pine? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A mutation results in the loss of the finger-like cell wall ingrowths found in normal placental transfer tissues. What effect is this mutation most likely to have on the development of the embryo?
A. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased. B. The embryo will develop too quickly because the rate of nutrient transfer from mother to embryo will be increased. C. The embryo will be unaffected because plant embryos are not dependent on transfer of nutrients from maternal tissues. D. The embryo will be unaffected because the cell wall ingrowths of placental transfer tissues have no effect on nutrient transfer from maternal tissues. E. The embryo will be unable to develop because necessary sugars can no longer be transported across the plasma membrane.
A current news story describes a cruise ship in the Caribbean with an outbreak of diarrheal illness, affecting hundreds of people. With all of those people in a small area, opening and closing doors, using handrails, etc, you are trying to figure out what infectious agent may be the cause. Your most likely guess is that the pathogen is ________.
A. Clostridium difficile B. shiga-toxin-producing E. coli C. cholera D. hepatitis B E. norovirus
Walking pneumonia is caused by
a) Legionella pneumophila. b) Chlamydophila pneumoniae. c) Mycoplasma pneumoniae. d) Streptococcus pneumoniae.