When the left ventricle contracts, blood moves into the:
a. aorta
b. pulmonary artery
c. left atrium
d. superior vena cava
e. pulmonary circuit
a
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By examining the phylogenetic tree diagrammed in the figure above, what conclusion can you draw about the species G. microti?
A) It evolved before G. intestinalis. B) It is more closely related to G. muris than to G. intestinalis. C) It should not be labeled a species distinct from G. intestinalis. D) It is part of a monophyletic group that also includes G. intestinalis.
Most mobile DNA consists of
A) transposable elements. B) introns. C) linear chromosomes. D) plasmids.
Mitochondria are thought to have arisen from
A. Cyanobacteria B. Mycoplasma C. a- proteobacteria D. Archaea
Which of the following statements about the endoplasmic reticulum (ER) is false?
(a) The ER is the major site for new membrane synthesis in the cell. (b) Proteins to be delivered to the ER lumen are synthesized on smooth ER. (c) Steroid hormones are synthesized on the smooth ER. (d) The ER membrane is contiguous with the outer nuclear membrane.