How many of the animal phyla include single-celled animals?
A) 0
B) 1
C) 2
D) 3
A
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Why are nuclear localization sequences (NLS) not removed after nuclear proteins are transported to the nucleus?
A. It is too energetically costly for the cell. B. An NLS may be located almost anywhere along the primary sequence of the protein. C. mRNA molecules are synthesized in the nucleus. D. The nuclear envelope breaks down with each cell division.
This diagram shows a simplified representation of bioenergetics, with arrows representing transfers of energy between various ecological components. Where do humans fall in this diagram?
a. from the sun to decomposers
b. from producers to producers
c. from decomposers to consumers
d. from consumers to the sun
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:
A. peptide bonds. B. hydrogen bonds. C. ionic bonds. D. covalent bonds. E. nonpolar bonds.
The sigma subunit of bacterial RNA polymerase ___________________
(a) contains the catalytic activity of the polymerase. (b) remains part of the polymerase throughout transcription. (c) recognizes promoter sites in the DNA. (d) recognizes transcription termination sites in the DNA.