The plasma membranes of root hair cells contain a variety of protein transport channels through which specific ions are transported, even against large concentration gradients, by  

A.  electron pumps.
B.  carbohydrate pumps.
C.  water pumps.
D.  proton pumps.
E.  root pumps.


D.  proton pumps.
The endodermal cells of the root actively transport nutrients using proton pumps.

Biology & Microbiology

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Earth's larges phosphorus reservoir is _____

a. the atmosphere c. sediments and rocks b. bird droppings d. living organisms

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Refer to Figure 46-1. The structures receiving air in figure 1 are known as:

a. anterior air sacs. b. parabronchi. c. spiracles. d. alveoli. e. tracheae.

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Resistant bacterial strains have evolved as a result of use and over use of _______________

Fill in the blank(s) with the appropriate word(s).

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A special sequence of nucleotides in DNA that marks the end of a gene; It signals RNA polymerase to release the newly made RNA molecule and then to depart from the gene

What will be an ideal response?

Biology & Microbiology