Microbes that are introduced into a culture medium to initiate growth are called a(n)
A. inoculum.
B. culture.
C. specimen.
D. medium.
Ans: B. culture.
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Plants contain meristems whose major function is to _____
A) attract pollinators B) absorb ions C) photosynthesize D) produce more cells E) produce flowers
The human genome is mostly composed of:
A. active retrotransposons. B. protein-coding genes. C. introns. D. transposons and retrotransposons that are mostly inactive. E. long repetitive sequences like centromeres and telomeres.
How do phosphates from the oceans reach rivers and lakes?
a. Phosphates dissolved in evaporated sea water precipitate over lakes and rivers. b. Phosphates form sedimentary rocks that are then uplifted by tectonic activity. c. Phosphates from animal bones collect in rivers and lakes where they slowly dissolve. d. Phosphate-rich sediment from the ocean floor is carried inland by hurricanes and tropical storms.
Most eukaryotic cells only express 20–30% of the genes they possess. The formation of heterochromatin maintains the other genes in a transcriptionally silent (unexpressed) state
Which histone modification directs the formation of the most common type of heterochromatin? (a) H3 lysine 4 methylation (b) H3 lysine 9 methylation (c) H3 lysine 14 methylation (d) H3 lysine 27 methylation