__________ is a gradual variation in phenotypes and genotypes over a geographic span
a. A cline
b. An ecotone
c. A realm
d. A biosphere
e. A community
A
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Biomagnification is a significant problem in aquatic communities. Levels of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to estimate the level of chemical X in a large-mouth bass. One alga can accumulate 1 unit of chemical X. Eachcopepod eats 15 algae. A minnow consumes 10 copepods, each large-mouth bass consumes 20 minnows.
A. 15 units B. 20 units C. 30 units D. 150 units E. 300 units F. 3,000 units G. 20,000 units Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about biomagnification? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Splicing of eukaryotic heteronuclear RNA is catalyzed by ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following best describes the mechanism that causes stomata to open?
A) Water accumulates below the opening and eventually causes the stoma to open. B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open. C) Two guard cells flanking each stoma control its opening by changing shape. D) The internal pressure of xylem sap expands the leaf, stretching the stoma open.
Which of the following regions of the genome is the least likely to be conserved over evolutionary time?
(a) the upstream regulatory region of a gene that encodes the region conferring tissue specificity (b) the upstream regulatory region of a gene that binds to RNA polymerase (c) the portion of the genome that codes for proteins (d) the portion of the genome that codes for RNAs that are not translated into protein