What percentage of the species that have ever lived have become extinct?
a. 1 percent
b. 9 percent
c. 50 percent
d. 75 percent
e. 99 percent
E
Biology & Microbiology
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Geneticists can create sequences of DNA from RNA using enzymes called ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Biology & Microbiology
A(n) ________ is a group of three bases on tRNA that is complementary to a specific mRNA codon.
A. poly-A tail B. anticodon C. codon D. cap
Biology & Microbiology
The thickness of a questioned glass sample can be measured with a _____.
What will be an ideal response?
Biology & Microbiology
The study of the immune system is known as:
Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology