The most widely accepted and supported model that explains the movement of xylem sap is the ____
mechanism.
a. cohesion-tension
b. translocation
c. pressure flow
d. osmosis
e. transpiration
A
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In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydrophobic substances. You start by adding equal amounts of vinegar and oil to a container. After shaking, the vinegar and oil levels separate, based upon polarity and density. To this you add glucose and sodium citrate and shake again. Where do you expect to find the glucose and sodium citrate in
greatest quantities? A) Both will concentrate in the oil layer. B) The glucose will concentrate in the vinegar, sodium citrate in the oil. C) Both will concentrate in the vinegar layer. D) Sodium citrate will concentrate in the vinegar, glucose in the oil. E) Both will be uniform throughout both layers.
The enzyme __________ binds to DNA during transcription.
Fill in the blank(s) with the appropriate word(s).
Louis Pasteur's experiment illustrated that
A) life began by chemical evolution. B) microbes will grow spontaneously in a nutrient broth that has been sterilized and sealed. C) only some organisms can form spontaneously in nutrient broth. D) microbes will not grow in a nutrient broth that has been sterilized unless air is allowed to enter the vessel through an opening. E) some complex molecules associated with living organisms can be synthesized by heating and cooling a solution of simple molecules and providing an electric spark.
Salmonella are
A) Motile B) Gram-positive rods C) Coliforms D) All of these choices are correct E) Lactose fermenters