How does the scanning electron microscope differ from the transmission electron microscope?
a. The SEM can view a live specimen.
b. The SEM can view the internal structure of a cell.
c. The SEM utilizes a beam of light that passes through the specimen.
d. The SEM gives a three dimensional image of the object being studied.
e. The SEM relies on the detection of electrons from the beam after contact with the specimens.
d
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Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin B. gibberellin C. abscisic acid D. ethylene E. 2, 4-D
The development of vaccinations began when Edward Jenner noticed that ________
a. people who had earlier exposure to cowpox did not develop smallpox b. people who drank water from a particular public water pump developed cholera c. bacteria removed from a sick animal would cause the same illness if injected into a healthy animal d. rats were always present when people contracted bubonic plague
The adrenal glands are closest to what organ(s)?
a. brain b. pancreas c. testes/ovaries d. thymus e. kidneys
When two amino acids combine via a dehydration reaction,
A. the R groups are lost. B. a peptide bond is formed. C. the amino group of each join together. D. water is added to begin the reaction. E. the carboxyl group of each join together.