Which of the following statements about viral origins
and evolution is NOT true?
a. Viruses may be descendants of parasitic cells.
b. Viruses may be genetic elements that escaped
from cells.
c. Viruses may represent a separate evolutionary
branch.
d. Most viral proteins are unlike any found in
cellular organisms.
e. Viral genes have no counterparts in cellular
organisms.
Answer: e
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A mutated gene that transforms a normal cell into a tumor cell is called a
a. proto-oncogene. b. oncogene. c. neoplasm. d. checkpoint gene. e. carcinoma.
The population below is being subjected to _____
1.directional selection
2.stabilizing selection
3.disruptive selection
4.selection against intermediate forms
The earliest type of eukaryotic organism currently known is a type of ____
a. virus b. bacterium c. alga d. animal-like protist e. fungus
When the cork cambium divides, it produces cork cells toward the inside. Indicate whether the statement is true or false