What is another name for autotrophs?
A. omnivores
B. producers
C. herbivores
D. carnivores
E. detritus feeders
Answer: B
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In an Hfr X F- conjugation, ____
a. the Hfr cell can lose chromosomal genes that it transfers to the F- cell b. the donor cell can become a partial diploid
c. plasmid DNA is transferred from the Hfr cell to the F- cell d. chromosomal DNA can be transferred from the F- cell to the Hfr cell e. chromosomal DNA can be transferred from the Hfr cell to the F- cell
Narrowing of the arterial lumen due to buildup of lipids is:
a. atrial fibrillation b. atherosclerosis c. a blood clot d. arrhythmia e. angioplasty
The coding sequence of the green fluorescent protein gene (GFP) is placed under the control of an enhancer active in neurons. When this transgene is introduced into flies, GFP will be expressed in
A) all neurons or a subset of neurons. B) all fly cells that have the transgene. C) all cells in the early embryo and then GFP will be silenced. D) all cells in the late embryo after neurons form.
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122-130 meters. The tallest know tree on Earth is 112.7 meters. Which of the following most likely limits the height of trees?
A. the amount of transpiration in leaves B. the amount of photosynthesis in leaves C. the amount of energy needed to pump water to the tops of the trees D. the strength of water cohesion E. the ability to take up CO2