Each of the following statements is a basic principle of the cell doctrine EXCEPT which one of the following?
A) All cells have a nucleus and organelles.
B) All living things are composed of cells and cell products.
C) A single cell is the smallest unit that exhibits all of the characteristics of life.
D) All cells come from preexisting cells.
A
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Which of the following are the water conducting cells of the xylem?
A. tracheids and parenchyma B. vessels and parenchyma C. sieve tubes and tracheids D. vessels and tracheids E. parenchyma and sieve tubes
Diatoms are used for four of the following. Which one is the exception?
a. biofuels b. ink c. filters d. cleaners e. insecticides
During fermentation, ________ is recycled by transferring its electrons to a molecule other than oxygen.
Fill in the blank(s) with the appropriate word(s).
The layer of cells that forms a barrier between the sperm and the egg is the corona radiata
Indicate whether the statement is true or false