Which of the following is TRUE about water?
a. The oxygen end is slightly electropositive.
b. Hydrogen bonds hold water molecules
together.
c. Water covers about one-half of the surface
of the earth.
d. Hydrophobic interactions attract water
molecules.
e. Solvent properties are greatest with
nonpolar molecules
B
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Which of the following statements about El Niño are true?
_____ Occurrence of El Niño is irregular and unpredictable. _____ The immediate effect of El Niño is a weakening in the east-to-west trade winds _____ Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast. _____ El Niño results in the movement of weather systems from the western Pacific eastward. _____ El Niño events in the Pacific can influence weather as far away as Africa.
If you wanted to prevent a regulatory protein from changing gene expression, you would have to prevent physical contact between the protein and _____
A) ribosomes B) DNA C) ribozymes D) mRNA
Acetate is the starting point for synthesis of a cell's ____
Fill in the blank with the appropriate word.
Which of the following is NOT a common characteristic of both mitochondrial and chloroplast genomes?
A. Composed of a double stranded chromosome. B. Composed of a single circular chromosome C. Has a small genome. D. Chloroplast genome is larger than the mitochondrial genome.