The main force that moves blood throughout the system of blood vessels is
a. arterial blood pressure.
b. skeletal muscle action.
c. smooth muscle action.
d. valve action.
e. venous blood pressure.
A
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In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
Identical (monozygotic) and fraternal (dizygotic) twins provide a natural experiment for investigating the influence of genetics on traits
Outline a study approach using twins, assuming you could identify enough pairs, in which you are examining the relative contribution of genetics on blood cholesterol level.
A persistent infection is one in which
A) the virus remains in equilibrium with the host without causing a disease. B) viral replication is unusually slow. C) the disease process occurs gradually over a long period. D) host cells are gradually lysed. E) host cells are transformed.
Which of the following is mismatched?
A) CO2 + 4H2 ? CH4 + 2H2O — Methane-producing bacteria B) 2 NO2- + O2? 2 NO3 — Nitrobacter C) 6CO2 + 6H2O ? C6H12O6 + 6O2 — Clostridium D) N2 + 6H+ ? 2NH3 — Beijerinckia E) SO42- + 10H+ ? H2S + 4H2O — Desulfovibrio