Which of the following regulates the fluidity of the plasma membrane?
a. Temperature
b. Cholesterol
c. Carbohydrate
d. Protein
b. Cholesterol
Cholesterol regulates the fluidity of the plasma membrane.
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What is the function of the centromere?
A. to attach the DNA to the plasma membrane B. to attach the chromosome to the spindle C. to attach the sister chromatids to each other D. to organize the microtubules to form a spindle
The proposition that species change through time was proposed by ____
a. Charles Darwin only b. Jean Baptiste de Lamarck only c. Alfred Russel Wallace only d. Charles Darwin and Jean Baptiste de Lamarck e. Charles Darwin, Jean Baptiste de Lamarck, and Alfred Russel Wallace
In hereditary nonpolyposis colon cancer, mutations in MutS and MutH proteins result in the accumulation of mutations caused by
A) mismatched base pairs. B) structurally damaged bases. C) double-stranded DNA breaks. D) thymine dimers. E) DNA recombination.
The hole in the ozone layer is most dramatic over ____.
A. Antarctica B. North America C. Asia D. Europe E. Africa