The imprinting center is found in the promoter region of a non-coding gene called SNRPN. Based on the differences in modifications between the two copies of chromosome 15 in imprinted cells, which of the following statements about SNRPN would be true? A. The maternal copy of SNRPN is more highly expressed than the paternal copy.
B. The paternal copy of SNRPN is more highly expressed than the maternal copy.
C. Both copies of SNRPN are highly expressed.
D. Both copies of SNRPN are silenced.

Where can you find prokaryotic and eukaryotic cells?

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.