Physicians have used imaging techniques for medical diagnosis for some time, but recently have begun usage of magnetic resonance imaging (MRI), which depends on _____.
A. ultrasound
B. X-rays
C. the behavior of hydrogen atoms in water molecules in a strong magnetic field
D. sound waves
C. the behavior of hydrogen atoms in water molecules in a strong magnetic field
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The DNA double helix is held together by (covalent/ionic/hydrogen) bonds
What will be an ideal response?
Which of the following chemical bonds is the strongest?
A. hydrogen B. Van der Waal forces C. hydrophobic interactions D. ionic E. covalent
Which phylogenetic model proposes that the first eukaryotes originated from a pool of many species of prokaryotes engaged in multiple methods of horizontal gene transfer?
a. tree of life b. ring of life c. web of life d. cloud of life
All of the following are true of every cell of the early
human embryo EXCEPT that a. each has the same genes as all the others. b. each can give rise to an entire human. c. they are undifferentiated. d. all will differentiate alike. e. all have maternal messages.