A microRNA is ________ bases long.

A) 2 or 4

B) 12 or 13

C) 21 or 22

D) 100 or 110


C) 21 or 22

Biology & Microbiology

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Macroscopically visible growths or clusters of microorganisms on solid media are called ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

A carbon atom has an atomic number of 6 and an atomic mass of 12. Assuming it is neither an ion nor part of a molecule, how many electrons does it have?

a. four b. five c. six d. eight

Biology & Microbiology

Which general organic compound forms ringed carbon structures?

a. Aromatic hydrocarbons b. Chlorofluorocarbons c. Aliphatic hydrocarbons d. Hydrostatic hydrocarbons

Biology & Microbiology

What gene encodes a protein that will inhibit cell division?

A) angiogenesis inhibitor B) growth factor C) oncogene D) tumor-suppressor gene

Biology & Microbiology