The cholesterol associated with animal cell membranes
A) is attached to membrane proteins and extends into the watery environment surrounding the cell.
B) helps to keep phospholipids from being too close to one another.
C) is an abnormality resulting from a diet high in cholesterol.
D) helps solidify the membranes when the room temperature is below freezing.
Answer: B
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Which stage of cellular respiration requires oxygen that you breathe?
A. Glycolysis B. Electron transport chain C. Citric acid cycle D. Both the citric acid cycle and the electron transport chain require oxyen
The two types of transposable elements are DNA transposable elements (DNA TEs) and long terminal repeats (LTRs)
A. true B. false
The vast majority of workers in maquiladoras and Export Processing Zones are
A) children. B) women. C) men. D) the elderly. E) people of African descent.
The results of Lederberg and Tatum’s experiments with E. coli auxotrophs indicated that ____
a. bacteria can be transformed when free DNA is available in their environment b. bacteria are able to exchange genetic material with eukaryotic organisms c. bacteria reproduce by sexual rather than asexual reproduction d. genetic recombination can occur in bacteria e. genetic recombination does not occur in bacteria since they do not undergo meiosis