Scientists estimate that about ________ of the world's eukaryotic organisms have been discovered and given scientific names.
A. 15%
B. 40%
C. 5%
D. 90%
E. 1%
Answer: A
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The movement of organisms away from their place of origin, called ____, can produce a ____ distribution, in which
closely related species live in widely separated locations.
a. fragmentation; continuous b. vicariance; disjunct c. vicariance; continuous d. dispersal; disjunct e. dispersal; continuous
The helix structure on the right of the above figure represents
a. DNA. b. RNA. c. lipid. d. protein. e. phospholipid
Ricin is
a. a substance found in castor bean seeds. b. a polysaccharide extracted from rice. c. an ingredient in many paints and cosmetics. d. a protein that inactivates ribosomes. e. a substance found in castor bean seeds and a protein that inactivates ribosomes.
Assume that a cross is made between AaBb and aabb plants and that the offspring occur in the following numbers: 106 AaBb, 48 Aabb, 52 aaBb, 94 aabb. These results are consistent with which arrangement of alleles?
What will be an ideal response?