Replication of DNA is semi-conservative.
a. true
b. false
Answer: a. true
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Water is able to cross plant plasma membranes by a combination of
A. osmosis and aquaporins. B. evaporation and diffusion. C. root pressure and turgidity. D. diffusion and phloem. E. transpiration and Casparian strips.
An organism's is its position in the food chain, relative to the ecosystem's energy source.
A. keystone level B. climax level C. trophic level D. habitat E. niche
A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate. B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. C) two versions of the experiment are conducted, one differing from the other by only a single variable. D) one experiment is performed, but the scientist controls the variables.
Inhaling or "huffing" is a way to achieve a high, usually by breathing in a fat-soluble substance. Which of the following structures would be most likely attacked first?
A) neuron B) myelin sheath C) axon D) dendrite