What name is given to the food-trapping cells of sponges?
A) cnidocytes
B) amoebocytes
C) skeletal fibers
D) choanocytes
D
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The pigments responsible for the color of red algae are the prodigiosins
Indicate whether the statement is true or false.
Why do plant roots populate the A horizon most heavily? What will be an ideal response?
Nitrogen is the most abundant element in the atmosphere, and a crucial component of proteins, vitamins, and nucleic acids. However, plants and other producers cannot use nitrogen in its natural form (N2)
Nitrogen has to undergo a process called nitrogen fixation. What does this process involve? A) It is the synthesis of ammonia from nitrogen gas by certain bacteria. B) Nitrate is converted to ammonia. C) Ammonia is converted to nitrate. D) It is undertaken by denitrifying bacteria. E) Nitrogen is accumulated in dead organic matter.
Which type of membrane protein will be used to bind to hormones?
A) channel proteins B) carrier proteins C) cell recognition proteins D) receptor proteins E) enzymatic proteins