The best term for the process by which some exons are included in a mature mRNA from one cell but are absent from the mRNA in another cell is
A. RNA interference.
B. chromosomal remodeling.
C. alternative splicing
D. Pre-mRNA splicing.
C
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Adequate intake of ____ by a mother-to-be
before and during early pregnancy may reduce the risk of spina bifida and other serious neural tube defects. a. carbohydrates b. folic acid c. calcium d. vitamin C e. sodium
Besides selection on multilocus genotypes, there are two other mechanisms that can create linkage disequilibrium. What are they?
What will be an ideal response?
How is a single strand of DNA able to serve as a template for the synthesis of another strand?
a. Nucleotides pair with those of the original strand to form a new strand. b. Hydrogen bonds holding the two strands together are easy to break, allowing one strand to be a template. c. A single strand of DNA is not able to serve as a template. d. One strand of DNA directs the synthesis of a new strand on its partner. e. Both the pairing of nucleotides and the breaking of hydrogen bonds.
The differential distribution of wing length in Drosophila, with larger wings in northern areas and smaller wings in
southern climates, provides evidence that:a. wing length is not a heritable trait. b. the fossil record is usually inaccurate. c. the molecular clock cannot be applied to fruit fly traits. d. chance is the most important agent in evolutionary change. e. natural selection is the most important agent in evolutionary change