Why do veins have less elastic components than arteries?
What will be an ideal response?
When blood enters the arteries, it is traveling fast and with a great deal of pressure. The arteries must
have a lot of elasticity so that they can swell and recoil as a response to the pressure exerted by the
blood flow. By the time blood enters veins, the pressure is greatly dissipated and not as much elasticity
is required.
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What is the difference between the function of DNA and the function of proteins?
A) DNA performs most cellular functions and proteins store information. B) DNA stores genetic information in the order of nucleotides and proteins store genetic information in the order of amino acids. C) DNA stores genetic information and proteins perform most cellular functions. D) DNA provides structure to the cell and proteins act as enzymes.
What is the response of a cell surface receptor to the binding of a signal molecule?
a. The cell surface receptor denatures. b. The signal is transduced through the plasma membrane into the cell. c. The receptor relays a signal to another location of the cell surface. d. The cell surface receptor flips through the membrane to the inside of the cell. e. Polarization of the cell surface changes.
Protostomes develop through
A. polar cleavage. B. protocleavage. C. spiral cleavage. D. radial cleavage. E. axial cleavage.
The double-strands of DNA result from the formation of ________ between the bases
A) covalent bonds B) peptide bonds C) ionic bonds D) hydrogen bonds E) ??1,4 bonds