The study of learning has been considerably advanced through studies of the California sea slug Aplysia. Which of the following is NOT a reason Aplysia is well suited to these studies?
A. It has a simple nervous system with only about 20,000 cells.
B. Some of its neurons are very large, enabling the insertion of electrodes for recording.
C. Some of its neurons are very large, enabling the injection of dyes that allowed tracing the paths and connections of these neurons.
D. The large size of some neurons allowed isolation of proteins and mRNAs from these neurons.
E. All of the choices for this question are correct.
E. All of the choices for this question are correct.
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Clostridium botulinum produces a deadly toxin that stops muscle contractions by
a. destroying cell membranes. b. killing mitochondria. c. disrupting the structure of actin filaments. d. preventing ATP synthesis. e. blocking acetylcholine release.
Before Watson and Crick described DNA structure, Linus Pauling proposed a possible model with three strands of support running down the middle and the bases extending out the sides. How did Pauling's model differ from Watson and Crick's?
A. Pauling proposed three support strands while Watson and Crick proposed two strands. B. Pauling proposed that the bases stick out the sides of the molecule while Watson and Crick proposed the bases were paired in the middle. C. Pauling proposed the support strands ran down the middle of the molecule while Watson and Crick proposed the support strands ran down the sides. D. All of the choices describe how Pauling's model was different than Watson and Crick's model.
List and describe the three types of joints found in the human body.
What will be an ideal response?
An example of a member of the class Anthozoa of the phylum Cnidaria is:
a. Portuguese man-o-war. b. jellyfish. c. sea anemone. d. sea wasp. e. hydroid.