A colleague gives you two tubes containing membrane fractions from an animal cell lysate. One tube contains the plasma membrane fraction, and the other tube contains the mitochondrial inner membrane fraction, but the tubes are not labeled
When you analyze the macromolecule composition of the samples, you are confident that the second tube contains the mitochondrial fraction, because the sample has
A) a higher ratio of cholesterol to phospholipids.
B) a higher protein to lipid ratio.
C) a lower protein to lipid ratio.
D) more carbohydrate in glycoproteins.
E) more GPI-anchored proteins.
Answer: B
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Segments of DNA that can move from one place to another within a cell’s genome are called ____
a. target sites b. transposases c. transposable elements d. replicative factors e. release factors
The Hardy-Weinberg rule is
a. useful in determining the extent to which a sexually reproducing population is evolving. b. used to predict when genetic drift will occur in a sexually reproducing population. c. useful in determining the extent to which polyploidy is occurring in specific plant populations. d. used to predict when specific groups of organisms will become extinct. e. all of these.
Observed genotypic frequencies in populations rarely match Hardy-Weinberg expectations exactly
Why is this so, and how do scientists determine if the frequencies they observe depart from the Hardy-Weinberg equilibrium to a biologically meaningful degree?
The leaf arrangement illustrated in Figure 34-1 is:
a. pinnate.
b. alternate.
c. compound.
d. whorled.
e. parallel.