Which element is not considered an essential micronutrient for plants in general, but is required by horsetails and
perhaps some grasses such as wheat?
a. gold
b. boron
c. silicon
d. zinc
e. magnesium
ANSWER: c
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The karyotype of a young patient shows two Barr bodies per cell. What condition might this child have?
A. Turner syndrome B. Triple X syndrome C. Down syndrome D. Klinefelter syndrome E. This child is a normal female.
The Earth is spherical, which causes differences in the intensity of solar radiation at different latitudes. The Earth is also titled on its axis at a 23.5? angle. How do you think this tilt affects the intensity of solar radiation?
A. In the Northern and Southern hemispheres, equal latitudes receive the sun's rays at equal angles year round.
B. The Northern hemisphere has a lower intensity of solar radiation than the Southern hemisphere because it is tilted away from the Sun year round.
C. The sun's rays strike the Northern hemisphere more obliquely during its summer months and less obliquely during its winter months.
D. The Northern hemisphere has a higher intensity of solar radiation than the Southern hemisphere because it is tilted toward the Sun year round.
E. The sun's rays strike the Northern hemisphere more obliquely during its winter months and less obliquely during its summer months.
Which of the following is NOT one of the body's nonspecific defenses against pathogens?
A) complement system B) inflammation C) natural killer cell D) cytotoxic T cell E) interferons
If a friend was taking large doses of vitamin C prescribed by a doctor, you might suspect that your friend was suffering from ?
A. pellagra B. rovkets C. pernicious anemia D. beriberi E. scurvy