Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by
A) muscles in the left ventricle.
B) blood flowing through the aorta.
C) blood pressure differentials from chamber to chamber.
D) blood recoiling against the closed valves.
Answer: D
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Facilitated diffusion and active transport
A. both transport molecules into or out of a cell. B. are both not very specific as to which molecules are transported. C. both require a concentration gradient to function. D. both require an expenditure of energy in order to transport the molecules. E. both require a concentration gradient to function AND both require an expenditure of energy in order to transport the molecules.
Water molecules exhibit cohesive and adhesive properties. What is the chemical bond characteristic that contributes to these and other numerous important properties of water molecules?
A. The covalent bond strengths of water molecules change with pH, temperature, or solute conditions present. B. The covalent bonds that form water molecules transform to ionic bonds in presence of other molecules, temperature changes, or pH. C. Hydrogen bonds form between water molecules, not requiring gain, loss, or sharing of electrons. D. Bonds that form water are of the nonpolar covalent form. E. Ionic bonds between water molecules create increased surface tension.
Select the best response to the question. ? A health care worker wearing gloves to prevent contact with a patient's blood ?will have an effect on which part of the chain of infection?
A) the source of infection B) transportation of the pathogen C) entry of the pathogen into the body D)it does not affect the chain of infection
Genetic diversity arises as a consequence of ________, which produce(s) different alleles of a gene.
A. crossing over B. chromosome segregation C. gene swapping D. gene splicing E. mutations