Most of the Earth’s phosphorous is in the form
of
a. phosphoric acid.
b. elemental phosphorous.
c. phosphate.
d. phosphorous cations.
e. carbonate
C
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DNA double helices are soluble in water but insoluble in alcohol. How do these physical properties reflect the chemical structure of the DNA molecule?
A) The charged phosphate groups and sugars of DNA are hydrophilic. B) The purine and pyrimidine bases are hydrophilic. C) The 5 prime to 3 prime polarity of DNA makes it soluble in water but not in alcohol. D) The charged R-groups of DNA are hydrophilic.
The areas that have received the greatest attention in genetically modified plants are _____
A) improved product quality and increased pest and herbicide resistance B) improved product quality, more rapid growth rate through plant hormone production, and decreased herbicide resistance C) more rapid growth rate through plant hormone production, pharmaceutical production, and increased antibiotic resistance D) pharmaceutical production, production of useful compounds not normally found in nature (xenobiotics), and the ability to remove or neutralize toxic compounds from the environment (bioremediation)
Artificially synthesizing DNA strands (e.g., oligonucleotide primers) involves the careful attachment of one nucleotide at a time to an immobilized sequence
Indicate whether the statement is true or false.
Fungi that can grow as a mold or as a yeast are referred to as
What will be an ideal response?