Which system involves plasma proteins
activated when an organism's pattern receptors
become bound to anything?
a. cytokine
b. complement
c. suppressor
d. enhancer
e. coagulation
B
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The difference between gross primary productivity and net primary productivity is
a. the amount of sunlight reflected by plants. b. the rate of photosynthesis of autotrophs. c. determined by the amount of energy used for plant life processes. d. the rate of herbivorous consumption of autotrophs. e. negligible.
Community structure changes over relatively short timescales through succession, but it tends to be stable over longer geological timescales
Indicate whether the statement is true or false
Cells located in red bone marrow that give rise to platelets, red blood cells, and white blood cells are called ________ cells
Fill in the blank(s) with correct word
Why are there several structurally different pigments in the reaction centers of photosystems?
A) Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain. B) This arrangement enables the plant to absorb light energy of a variety of wavelengths. C) They enable the plant to absorb more photons from light energy, all of which are at the same wavelength. D) They enable the reaction center to excite electrons to a higher energy level.