The ______ ______ surrounds all cells and is ____________ _____________ to control what enters and leaves the cell.
Fill in the blank(s) with the appropriate word(s).
Ans: plasma membrane; selectively permeable
Biology & Microbiology
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Once the regulatory proteins and effector molecules are made, the actual mechanisms for regulation rarely require net energy input
Indicate whether the statement is true or false.
Biology & Microbiology
Low-growing, hardy plants of the __________ occur
at high latitudes, where there is a layer of __________. At high altitudes, similar plants grow as __________. Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
In the uterus, the ____________________ is shed during menstruation. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
What cellular organelle is especially abundant in phagocytic white blood cells?
A. nuclei B. nucleoli C. ribosomes D. lysosomes E. Golgi apparati
Biology & Microbiology