Stars provided ____ elements making up cells on Earth
a. none of the
b. about half of the
c. only the radioactive
d. most of the
e. all of the
ANSWER: e
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Define the purpose of cloning a gene into a plasmid cloning vector
What will be an ideal response?
Almost all enzymes are
a. carbohydrates. b. proteins. c. lipids. d. nucleic acids. e. amino acids.
Altering the three-dimensional structure of an enzyme might change the amount of energy needed for a reaction. prevent the substrate from binding the enzyme's active site. change the type of substrate that binds the enzyme's active site. change the type of product produced in the reaction. allow the reaction to occur at a faster rate.
What will be an ideal response?
Which statement does not represent one of Darwin's observations?
A. All individuals have an equal chance to survive and reproduce. B. Changes in populations are gradual and take place over long periods of time. C. Members of the same species may exhibit considerable variation. D. Some characteristics are heritable and passed on to offspring. E. Some characteristics afford their possessor a better chance of survival.