Which one of the following was not an adaptation seen in the sharks (Chondrichthyes)?
A. teeth
B. lateral line system
C. swim bladder
D. calcified cartilaginous skeleton
E. internal fertilization and internal development
Answer: C
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What is the function of gap junctions in cells?
a. Anchor the cells to basal lamina. b. Hold the cell wall close to the plasma membrane. c. Allow ions and small molecules to flow freely between cells of a given tissue type. d. Serve as a scaffold for active transport proteins to cluster together. e. Anchor the cells to neighboring cells.
_____ are signaling molecules that travel through the blood to target cells
a. Hormones c. Local signaling molecules b. Neurotransmitters d. all of these
The effects of the drug scopolamine suggest that _______ plays an important role in __________.
A) dopamine; schizophrenia B) serotonin; depression C) acetylcholine; learning and memory D) GABA; seizures
What can you conclude from this figure?
A) Nematodes have more genes that mustard plants. B) The size of the genome is negatively correlated with the number of genes. C) Mammals tend to have the largest genomes. D) Animals have the largest numbers of genes. 