What is a "benign" tumor?
A) A mass of cancerous cells
B) A single mutated cell that could potentially develop into cancer
C) A mass of cells that grows out of control and spreads to other tissues
D) A mass of cells that grows out of control but remains at the site of origin
D
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The cell wall component algin is
(a) found in the brown algae. (b) used in the production of ice cream. (c) used as a medium on which microorganisms are grown. (d) both a and b.
In humans, XO individuals are females with Turner syndrome and XXY individuals are males with Klinefelter syndrome. Red-green color blindness is caused by an X-linked recessive allele. Suppose a color-blind man and a woman with normal vision and no family history of color blindness married and had a daughter who was color blind and had Turner syndrome. Which event could have given rise to this offspring?
A) nondisjunction at meiosis I in the mother B) nondisjunction at meiosis II in the mother C) nondisjunction at meiosis I in the father D) nondisjunction at meiosis II in the father E) nondisjunction at either meiosis I or meiosis II in the mother
The cell membrane is composed of a bilayer of ________. These molecules have regions that are polar and nonpolar and are therefore ________
Fill in the blank with correct word.
Which of the following statements about the evolution of life histories is correct?
A) Stable environments with limited resources favor r-selected populations. B) K-selected populations are most often found in environments where density-independent factors are important regulators of population size. C) Most populations have both r- and K-selected characteristics that vary under different environmental conditions. D) The reproductive efforts of r-selected populations are directed at producing just a few offspring with good competitive abilities. E) K-selected populations rarely approach carrying capacity.