Using its antennae, the male moth finds female moths by following a trail of airborne chemicals, called pheromones, upwind from the female producing them. This is an example of how living things
A) grow.
B) acquire nutrients.
C) reproduce.
D) maintain precise internal conditions.
E) detect and respond to stimuli.
E
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Microinsertions and microdeletions often result in ________ mutations
A) auxotrophic B) advantageous C) silent D) frameshift
Polar covalent bonds:
A. can result in molecules having an electric dipole moment. B. can result in molecules having separated positive and negative charges. C. will not be present in nonpolar molecules. D. occur when the electrons in the bond are shared between the atoms but biased toward one atom in the bond. E. All of these choices are correct.
What is the name of the enzyme that adds CCA to the 3' end of tRNAs?
A. tRNA nucleotidyltransferase B. Aminoacyl-tRNA synthetase C. RNA polymerase D. Peptidyl transferase
The lack of corals near the mouths of the Orinoco and Amazon rivers is primarily due to:
a. cool northern flowing currents. b. cool upwelling water. c. massive fresh water out-flow. d. clear water. e. both a and b