How many potential reading frames are there in a 1500-bp segment of double-stranded DNA?
A) 4 B) 6 C) 5 D) 1 E) 2
Answer: B
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This photo shows early frog embryos, each a product of three mitotic divisions of the nucleus of one fertilized egg. How many nuclei does each of these embryos contain?
1.2
2.4
3.8
4.16
Changing conformation at the active site as a result of binding a substance at a different site is known as ________
Fill in the blank(s) with correct word
Two cells that contain similar steroid receptors may nevertheless respond differently to the steroid if they:
A) contain different DNA strands B) make different steroid receptor cofactors C) have been exocised D) lack lipid nuclei
Which is an example of subfunctionalization of a gene duplicate?
A. Gene duplication leads to new combinations of existing exons, as in the jingwei locus B. A duplicate of a metabolic gene evolves to work as an antifreeze protein in an Arctic fish. C. Retrotransposition of the Alu elements into many positions in the genome D. Duplication of hemoglobin genes allows specialized versions to be expressed in fetus vs. adult. E. A gene is duplicated to a new position in the genome, but its regulatory elements are missing, so it is never expressed.