The core of a virus is
a. a protein.
b. a sugar.
c. a nucleic acid.
d. a fat.
e. a phosphate.
C
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How can two cells in the same complex multicellular organism have different fates?
A. Different genes are activated and repressed in the two cells. B. Different DNA sequences are found in the nuclei of the two cells. C. Different amounts of DNA are found in the nuclei of the two cells. D. Different types of transcription and translation machinery are found in the two cells. E. All of these options are correct.
What contribution did Charles Lyell make?
A. He found some fossils of extinct species. B. He provided the first evidence that the Earth is much older than was previously thought. C. He suggested that life evolves through physical changes within the life span of an organism. D. He found some bird specimens on the Galapagos Islands.
Four of the five answers listed below are events that can lead to secondary succession. Select the exception
a. a mudslide that destroys a section of a shrubland b. torn down buildings leading to vacant lots c. retreat of a glacier in Alaska d. a fire e. hurricane-damaged coastal marshes
A region of ________ occurs where deep waters of the ocean move upward to the surface
Fill in the blank(s) with correct word