Analysis of DNA fragments in gel electrophoresis is based on
A. DNA having an overall negative charge and moving to the positive pole.
B. DNA fragments being stained so that they can be seen.
C. application of an electric current through the gel causing DNA fragments to migrate.
D. larger fragments moving slowly and remaining closer to the wells.
E. All of the choices are correct.
Answer: E
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Why can't a female lizard have both high fecundity and high survival?
A) In only rare cases, lizards have both high fecundity and high survival. B) Female lizards are able to produce only one set of offspring. C) Competition for resources prevents this. D) The more energy the female devotes to offspring, the less that can be devoted to her survival. E) The female is already maximizing the number of eggs she lays, and if she attempts to nest later in the season, there will not be enough food for her young.
All of the following are model organisms, except
A) Saccharomyces cerevisiae. B) Drosophila melanogaster. C) Caenorhabditis elegans. D) Arabidopsis thialana. E) Homo sapiens.
A difference between a grassland and a savanna is
A. the pattern of rainfall. B. fire. C. carnivores. D. decomposers.
Tubeworms around deep-sea hot vents house which symbiotic organism?
What will be an ideal response?