Which of the following is true of mRNA?
A) It has a fixed size of 750 nucleotides.
B) It has a high concentration.
C) It is a long lived molecule.
D) Its nucleotide sequence is complementary to that of one strand of DNA.
D
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The eccentricity portion of Milankovitch's astronomical theory refers to:
A) variations in the energy emitted by the Sun. B) the unpredictability of Earth's weather. C) changes in the shape of Earth's orbit. D) changes in the rate of Earth's rotation. E) changes in the tilt of Earth's axis.
One way that humans intervene in the nitrogen cycle is by facilitating ____.
A. denitrification B. nitrogen fixation C. nitrification D. acid deposition E. phosphorization
Some planktonic cyanobacteria have the ability to "fix" which of the following elements, thus having a fertilizing effect on the marine environment similar to the ability of the land plants legumes?
A. hydrogen B. oxygen C. nitrogen D. helium
Minerals that are vital to defense and modern technology are ________
Fill in the blank(s) with correct word