From X-ray diffraction data, which of the
following was determined about DNA?
a. The amount of adenine equaled the amount
of thymine.
b. Different species have different proportions
of adenine and guanine.
c. Nitrogen containing bases were arranged on
the outside of the double helix structure.
d. The shape of the molecule could be a
double helix.
e. All of these were determined
D
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Which of the following is a characteristic of a foundation species?
a. being a primary producer b. being a voracious feeder c. reproducing asexually d. lacking natural prey
In the lungs of cystic fibrosis patients, ____
a. chloride ions are stuck inside epithelial cells b. water is excessively abundant on epithelial surfaces c. epithelial surfaces are coated with slippery mucus d. excess water and chloride ions are pumped out of epithelial cells e. chloride ions are not transported out of epithelial cells, and epithelial surfaces are dry
Respond to statements 110–113 in reference to the four kinds of
energy listed below. a. chemical b. mechanical c. thermal E 110. Receptors on the tongue detect variation in this kind of energy. M 111. Olfactory receptors detect this kind of energy. M 112. Ears detect this kind of energy. E 113. The warmth you feel from a campfire is a result of detecting this kind of energy.
When blood calcium levels fall, ____
a. PTH secretion increases b. osteoblast activity increases c. osteoclast activity decreases d. growth hormone activity increases e. calcitonin secretion increases