What gram-positive organisms are the smallest living cells?
a. actinomycetes
b. halophiles
c. prions
d. mycoplasmas
e. cyanobacteria
D
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The skeleton of vertebrates serves several important functions. Among these are
_____ support and locomotion. _____ blood formation. _____ conduction of nerve signals. _____ protection of organs and soft tissues. _____ calcium homeostasis.
The cellular basis of muscular dystrophy is that some of a child's muscle cells
A) have combined into a structure that cannot contract. B) lack DNA. C) lack a protein that enables them to withstand the force of contraction. D) have too much of a contractile protein and become weak.
Which bacteria cause Lyme disease?
a. Streptococcus pyogenes b. Staphylococcus aureus c. Escherichia coli d. Borrellia burgdorferi e. Bordetella recurrentis
During exercise, O2 is depleted in muscle tissue. What effect would this have on internal respiration?
A) There would be decreased diffusion of O2 out of the blood and into the muscle tissue and a decrease in heart rate to bring more O2 to the exercising muscle. B) There would be decreased diffusion of O2 out of the blood and into the muscle tissue. C) There would be increased diffusion of O2 out of the blood and into the muscle tissue. D) There would be increased diffusion of O2 out of the blood and into the lungs.