Phospholipids and ________ are the major components of cell membranes.
A. glycolipids
B. cholesterol
C. glucose transporters
D. glycocalyx
E. proteins
E. proteins
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Multi-cellularity is believed to have evolved multiple times on Earth
Indicate whether the statement is true or false.
In prokaryotes, the genes for metabolic pathways are
a. always on for early steps in the pathway, but genes for later steps are generally off. b. always on so the bacteria can respond rapidly to changing conditions. c. turned on and off as conditions change. d. independently regulated. e. expressed in low levels all of the time, but will be expressed in higher levels when conditions warrant.
A true body cavity completely surrounded by ____ is called a coelom
a. ectoderm
b. mesoderm c. endoderm d. exoderm e. mesoglea
Which term refers to a bacterial protein that causes disease only after the cell has been disrupted?
a. endospore b. heterocyst c. endotoxin d. exotoxin