Which of the following statements about bacteriocins is FALSE?
A) The genes coding for them are on plasmids.
B) They cause food-poisoning symptoms.
C) Nisin is a bacteriocin used as a food preservative.
D) They can be used to identify certain bacteria.
E) Bacteriocins kill bacteria.
B
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The advantage of having a double circulation is that the ventricles may act as two pumps with an ability to deliver blood at different pressures. Which animals exhibit a "double circulation" and four-chambered hearts? Check all that apply.
_____ humans _____ dogs _____ crocodiles _____ frogs _____ birds _____ turtles
The ____ is the developmental origin of the body cavity between the gut and muscles of the body wall
for most protostomes.
a. schizocoelom b. mesoglea c. archenteron d. enterocoelom e. blastopore
A polar molecule moves across a membrane from a region of high concentration to a region of low concentration by a process called
A. simple diffusion. B. facilitated diffusion. C. active transport. D. phagocytosis.
What is the three-dimensional shape created by hybrid orbitals that are formed when a carbon atom is covalently bonded with four other atoms?
A. a flat sheet with carbon in the center B. a triangle with carbon in the center C. a cube with carbon in the center D. a tetrahedron with carbon in the center E. All of the above are possible.