Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is
A. hypotonic.
B. hypertonic.
C. isotonic.
D. turgid.
E. saturated.
Answer: A
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Toxins can lead to:
a. increased harvestable metals in the ocean. b. reduction in anaerobes in the sediment. c. reduction in primary production. d. increase in primary production. e. increase in individual size and growth rates.
At the molecular level, how do proteins like repressors bind to DNA? How can binding affinities be increased or decreased?
What will be an ideal response?
A friend asks you for a definition of endemic because she is writing a history paper and this word keeps occurring in the literature in reference to bison on the Great Plains of the United States. Your response is that the word endemic means
A. a species that has coevolved with humans on Earth. B. a species that lives in only one area of Earth. C. a species that has gone extinct since humans have evolved on Earth. D. a species that exists in many habitats on Earth.
Distribution of daughter chromosomes derived from sister chromatids during meiosis II then leads to a total of ______ new cells, each with the haploid number of chromosomes.
Fill in the blank(s) with the appropriate word(s).