Photosynthesis and respiration were the main causes of fluctuations in atmospheric CO2 levels over the last 500 million years
A. true
B. false
B
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Many integral membrane proteins have not been analyzed by X-ray crystallography. However, transmembrane segments can be inferred using computer analysis of the amino acid sequence of the protein. This technique is known as
A) homeoviscous adaptation. B) lipid analysis. C) lipid rafting. D) hydropathic analysis. E) SDS-PAGE.
All of the following statements about ferns are correct except
A. ferns flourish in many habitats, but the majority are located in the tropics. B. the sporophyte is a conspicuous generation. C. the gametophyte is a conspicuous generation. D. ferns have underground stems called rhizomes. E. sori are located on the back or ventral surface of fronds.
The field of ____________________ investigates similarities and differences in the genomes from different species. Fill in the blank(s) with the appropriate word(s)
What is the nucleosome core particle composed of?
a. histones H2A, H2B, H3, and H4 b. single-stranded binding proteins c. histones H1 and H2A d. histones H3 and H4