What causes the differences between two human cell types (for example, a skin cell and a brain cell)?
A) Different cell types begin with the same genes but eliminate certain genes as they develop.
B) Different cell types contain different genes.
C) Different cell types contain different proteins that give each cell a different function.
D) Different cell types contain the same genes but use different combinations of them.
D
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Which of the following is NOT synthesized from a DNA template?
A) messenger RNA B) amino acids C) tRNA D) ribosomal RNA
The nitrogenous waste in mollusks is removed by
A. flame cells. B. nephridia. C. Malpighian tubules. D. incurrent siphon. E. flagella.
Continental drift caused the large supercontinent that existed during the Paleozoic era to separate into a northern
continent, called ____, and a southern continent, called ____.
a. Pangaea; Laurasia b. Laurasia; Gondwana
c. Gondwana; Laurasia d. Pangaea; Gondwana e. Gondwana; Pangaea
The typical number of ____________________ in human diploid cells is 46. Fill in the blank(s) with the appropriate word(s)