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)
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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.
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
In what portion of a eukaryotic cell is the majority of DNA isolated?
a. nucleus b. mitochondria c. vesicles d. cytoplasm e. lysosome
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