Botulinum toxin (Botox) produced by certain bacteria will
A) prevent enzymatic breakdown of neurotransmitters.
B) cause continual contraction of smooth muscle.
C) initiate an increase in the strength of a transmitted signal.
D) inhibit the release of acetylcholine.
Answer: D
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Most cnidarians are known to produce toxins. In fact, it has been claimed that one particular species produces the most deadly of all toxins on the planet. What feature of this group most likely evolved simultaneously with the evolution of these toxins?
A) the medusa body form B) asexual reproduction C) a slow-moving or sessile lifestyle in the adult D) diploblastic design E) bilateral symmetry in the mobile larval forms
The function of an endosperm is to
a. attract pollinators. b. develop into an embryo. c. discourage animals from eating the plant. d. store starch and oils
People often use the term "theory" in a variety of ways, but to a scientist, a theory has a specific meaning. Briefly describe the important features of a scientifically based theory
What will be an ideal response?
__________ is mostly water in which diverse ions
and molecules are dissolved. Fill in the blank(s) with the appropriate word(s).