The interaction of sympathetic and
parasympathetic systems is best described as
a. antagonistic.
b. cooperative.
c. overriding.
d. synergistic.
e. ineffective.
A
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The condition that develops on a previously damaged heart valve is called
A. an aneurysm. B. acute bacterial endocarditis. C. myocarditis. D. subacute bacterial endocarditis.
Inversion heterokaryotypes are often characterized as having reduced crossing over and reduced fertility
Assume that you were examining a strain of organisms you knew to be inversion heterokaryotypes and saw a relatively high number of double chromatid bridges extending between anaphase I nuclei. What would be a likely explanation for this observation? Explain with a labeled diagram.
What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?
A. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. B. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules. C. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. D. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes.
Why is it important that CO2 be rapidly removed from the cells of animals?
a. because high cellular CO2 affects cellular respiration b. because high cellular CO2 is a narcotic poison c. because CO2 damages nerve function d. because CO2 damages muscle function