A core sample is taken 100 km west of and parallel to a ridge system. Magnetic readings of the rock show a reversal of the Earth's magnetic field. How many km east of the ridge system must scientists travel to collect a core sample with the same magnetic properties?
a. 50
b. 100
c. 200
d. 0 km; collect the sample directly at the ridge
B
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A stream flows through marshes, farmland, and suburban housing developments before emptying into the ocean. Describe three ways in which the different land areas along its course affect the water quality of the stream.
What will be an ideal response?
Which statement about the structure of proteins is false?
A) Proteins are made of long strings of 20 different common amino acids in different orders. B) The order of amino acids in a polypeptide determines the three-dimensional shape of the folded molecule. C) The chemical properties of each amino acid are determined by the amino acid's side chain. D) Most proteins consist of two amino acid polymers attached together by hydrogen bonding.
A chemical interaction in which the products contain less free energy than the reactants is called a(n)
____________________ reaction.
Fill in the blank(s) with the appropriate word(s).Which direction are phosphodiester bonds of DNA usually built in?
A) 3' ? 5' B) 5' ? 1' C) 1' ? 5' D) 5' ? 3' E) Any direction is fine and will not affect the function of the DNA strand.