Genetic modification
A) alters genetic codes so that one species' code is like another's.
B) adds sugars and phosphates in a nucleus.
C) alters, deletes, or adds DNA to a cell.
D) substitutes entire nuclei to genetically engineer a cell.
C) alters, deletes, or adds DNA to a cell.
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You and a classmate are discussing early experiments in genetics, and you state that Avery, MacLeod, and McCarty provided the first evidence that DNA carries genetic information. Your classmate argues that Griffith was the first to demonstrate this. Which statement best defends your argument?
A. Because Avery, MacLeod, and McCarty did their experiments after those done by Griffith, they had much more information regarding the structure and function of DNA. B. Although Griffith first demonstrated transformation, Avery, MacLeod, and McCarty provided evidence that DNA rather than protein or RNA was the transforming agent. C. DNA used by Avery, MacLeod and McCarty was extracted solely from transformed strains of pneumococci, while Griffith used native pneunococcal strains. D. Enzymes were used in the experiments carried out by Avery, MacLeod, and McCarty while Griffith transformed cells chemically or by using heat. E. Avery, MacLeod, and McCarty worked with purified DNA extracts while Griffith worked with bacterial strains.
Alzheimer’s disease involves damage to brain neurons that release ____, while Parkinson’s disease is caused by a
shortage of the neurotransmitter ____.
a. acetylcholine; dopamine b. dopamine; acetylcholine c. norepinephrine; serotonin d. serotonin; norepinephrine e. dopamine; acetylcholine
Since viruses are typically 20-200 nm in diameter, the ____ microscope is best for viewing them
a. light
b. electron
c. fluorescent
d. polarizing
e. contrasting
In a bottle of water, hydrogen bonding occurs between the hydrogen of one atom and a/an:
A) hydrogen atom in the same molecule. B) hydrogen atom in a different molecule. C) oxygen atom in a different molecule. D) oxygen atom in the same water molecule.