The collective human ecological footprint is now much larger than Earth's sustainable resource base
Indicate whether the statement is true or false
TRUE
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In the digestive system, some protease enzymes must be secreted as an inactive form and then activated later by proteolytic cleavage once outside of the secreting cell to prevent active proteases from damaging the secreting cells. What is the category of precursor proteins of this type?
A) ubiquitins B) zymogens C) glycosides D) activins
The phospholipids of plasma membranes have
a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. a hydrophilic head and two hydrophilic tails.
What statement below characterizes pigments’ function?
a. They absorb some photons. b. They reflect all photons. c. They absorb photons of all colors. d. They absorb photons of all wavelengths. e. They absorb ultraviolet wavelengths.
The cap and tail are not part of the message used to construct a polypeptide. If false, make it a correct statement.
a. true b. false