Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never did succeed in that endeavor
What will be an ideal response?
Medieval alchemists understood the transformative processes of heat and other simple chemical reactions but lacked a fundamental understanding of matter at the atomic level. Specifically, they were attempting to remove protons from lead (Pb) to create gold (Au), a process that would be incredibly difficult and require massive quantities of energy as lead represents a particularly stable element.
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Prenatal diagnosis techniques such as amniocentesis and chorionic villus sampling remove cells that
were produced by an embryo. These cells are then used
a. to treat diseases. b. for implantation to produce pregnancy. c. to develop embryonic stem cells. d. to test for the presence of mutant alleles or chromosomal alterations. e. for cloning.
Describe the general relationship that may exist between mutations and cancer
What will be an ideal response?
What is contained within the xylem sap of a plant?
A) water only B) water and dissolved minerals only C) water and sugars produced from photosynthesis only D) water, dissolved minerals, and sugars
Historically, in the field of taxonomy, what characteristic was most commonly used for determining species relationships?
A) Chromosomal similarity B) Anatomical similarity C) DNA sequence similarity D) Geographic proximity E) Capability of interbreeding