How can a single gene code for more than one protein?
A) Different types of ribosomes translate the resulting mRNA, producing different proteins.
B) The exons within an mRNA can be spliced together in different ways.
C) Different amino acid chains can be coded by the same mRNA.
D) Different RNA polymerases transcribe it and produce different proteins.
B
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Water held behind a dam would best reflect ______.
A. heat energy B. mechanical energy C. chemical energy D. potential energy E. kinetic energy
Biologists think that the first photosynthetic cells
a. used water as an electron donor. b. were the first living cells to develop. c. lived more than 2.8 billion years ago. d. released hydrogen into the atmosphere. e. required oxygen rather than carbon dioxide.
In cnidarians, nematocysts are housed in specialized cells called:A
choanocytes. B. cnidocils. C. pseudopodia. D. nerve nets. E. cnidocytes
In order for macromolecules to form, smaller molecules must be concentrated. All of the following have been proposed as ways for concentrating organic molecules EXCEPT?
A. Organic molecules could have collected on the surface of clay particles. B. Organic molecules could have been concentrated when they were trapped in small basins and the water evaporated. C. Organic molecules could have made copies of themselves and this resulted in concentrations of molecules. D. Organic molecules could have been concentrated when water froze.