Prokaryotes split into two lines early in the history of life. The differences are so fundamental that they are assigned to two different domains, the ________________ and the Bacteria.
Fill in the blank(s) with the appropriate word(s).
Archaea
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Members of class Hirudinida are the leeches
____________________ Indicate whether the statement is true or false.
Which of the following elements is a macronutrient in plants?
a. sodium b. calcium c. manganese d. zinc e. copper What will be an ideal response?
More than half a century ago, two cell biologists published details of their research involving isolated membrane vesicles from chloroplasts. Normally, the fluid inside these vesicles is near neutral
In an experiment, these membrane vesicles were soaked in an acidic solution (pH 4 ) until the inside of the vesicle also became pH 4. Based on the details provided in this scenario, by what mechanism could hydrogen ions have crossed the vesicle membrane, and what do you think happened at the molecular level? A) Active transport; hydrogen ions moved out of the vesicle with the help of ATP energy. B) Pinocytosis; water moved from outside the vesicle to inside. C) Facilitated diffusion; hydrogen ions moved into the vesicle through a channel protein. D) Simple diffusion; hydrogen ions moved into the vesicle through a channel protein. E) Osmosis; water moved from inside the vesicle to outside.
Which of the following statements about cells is true?
A) All cells have cell walls. B) All cells have internal structures that move. C) All cells are attached to other cells. D) All cells are motile.