The ________ consists of myelinated axons that conduct impulses over long distances
Fill in the blank(s) with correct word
white matter
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The flagella of bacteria rotate at their bases like propellers
Indicate whether the statement is true or false.
Which is most closely related to the hagfishes?
A. Lancelets B. Tunicates C. Lampreys D. Cartilaginous fishes
What is the main role of membrane proteins?
A) Hold the phospholipid bilayer together B) Block materials from entering the cell C) Regulate the passage of materials in and out of the cell D) There are no membrane proteins in the plasma membrane
Which is a true statement concerning genetic variation?
A) It is created by the direct action of natural selection. B) It arises in response to changes in the environment. C) It must be present in a population before natural selection can act upon the population. D) It tends to be reduced by the processes involved when diploid organisms produce gametes. E) A population that has a higher average heterozygosity has less genetic variation than one with a larger average heterozygosity.