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


(b)

Biology & Microbiology

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The hydrophobicity of the planar nitrogenous ring structures of a nucleotide, leading to the exclusion of water and stability of DNA, is referred to as:

A. Watson-Crick base pairing. B. supercoiling. C. base-stacking interactions. D. complementarity. E. polarity.

Biology & Microbiology

The site of new primary growth at the apex of a shoot is the ____

a. terminal bud b. internode c. axil d. lateral bud e. node

Biology & Microbiology

In what portion of a eukaryotic cell is the majority of DNA isolated?

a. nucleus b. mitochondria c. vesicles d. cytoplasm e. lysosome

Biology & Microbiology

Color blindness is caused by heritable mutations in cone photoreceptors. How many cone types does the retina of a colorblind individual typically contain?

A. Only one B. Two C. Three D. Four E. Five

Biology & Microbiology