What is the effect of DNA methylation?
A. It increases transcription.
B. It inhibits transcription.
C. It increases crossover events.
D. It decreases crossover events.
E. It promotes post-translational modification of proteins.
B. It inhibits transcription.
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Protruding papulae on the surface of echinoderms improve respiratory efficiency by ______.
A. increasing the concentration difference B. increasing the surface area for diffusion C. decreasing the distance for diffusion D. changing the diffusion constant
All of the following are examples of epigenetic changes except
A. microbial mucinase digests the protective lining of mucous membranes. B. microbe binds to small RNAs disrupting gene regulation. C. host cell genome is altered, interrupting transcription. D. histones are altered, which affects replication and transcription.
A student views a specimen with a light microscope. The ocular lens used is a 4x and the objective lens is 40x. What is the total magnification of the specimen viewed?
A) 36x B) 40x C) 44x D) 160x
The approach known as catastrophism explains Earth's geological features appealing to:
a. sudden catastrophic geological events. b. large-scale geological events. c. the same geological processes currently observable. d. A and B.