Which of the following statements concerning smooth muscle is true?
A. It contains many sarcomeres.
B. Caveolae seem to take the place of the myofibrils.
C. A calcium-calmodulin complex initiates cross-bridge formation.
D. The cells are large and multinuclear.
E. It has a well developed sarcoplasmic reticulum.
C
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Synthesis of mRNA is:
in the 5' to 3' direction with new nucleotides being added to the 5' end of the mRNA molecule. in the 3' to 5' direction with new nucleotides being added to the 5' end of the mRNA molecule. in the 5' to 3' direction with new nucleotides being added to the 3' end of the mRNA molecule. in the 3' to 5' direction with new nucleotides being added to the 3' end of the mRNA molecule. able to proceed either from the 5' to 3' or 3' to 5' direction.
Which of the following is NOT true of catalysts?
They are unchanged by the reaction catalyzed. They allow endergonic reactions to become exergonic reactions. They increase the amount of energy released by a chemical reaction. They lower the activation energy of the reaction.
Describe the functions of the lymphatic system
What will be an ideal response?
What is the function of the tunica interna?
A. Secretes a chemical to repel platelets so blood can easily flow through the vessel B. Anchors the vessel to surrounding tissue C. Contracts to move the blood through the vessel D. None of these are correct.