Which of the following amino acid chains would be produced from the mRNA sequence AUA-CUU-CCU-AGU-UGA?
A. Isoleucine - leucine - proline - serine - stop
B. Isoleucine - alanine - proline - serine - stop
C. Glycine - glutamate - lysine - lysine - stop
D. Isoleucine - leucine - stop - proline - serine
Answer: A
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Which sequence lists the correct order of dominant plants in the ecological succession in Glacier Bay, Alaska?
a. lichens and moss, shrubs, young conifers, established spruce and hemlock forests b. shrubs, young conifers, lichens and moss, established spruce and hemlock forests c. established spruce and hemlock forests, shrubs, young conifers, lichens and moss d. established spruce and hemlock forests, young conifers, shrubs, lichens and moss e. lichens and moss, shrubs, established spruce and hemlock forests, young conifers
Sympatric speciation is the most common method of speciation and accounts for almost all evolution
of new animal species. Indicate whether the statement is true or false.
Which of the following is not involved in the separation of paired chromatids and their movement to opposite poles?
a. Sister chromatids attach to microtubules in opposite halves of the spindle. b. Separase hydrolyzes cohesion, allowing chromatid separation. c. Tubulin fibers move the chromatids away from the equatorial plate. d. Polar microtubules push the chromatids to the poles. e. ATP is hydrolyzed by cytoplasmic dynein.
The high surface tension of water that allows some insects to literally walk on water is because of:
A. polar covalent bonds B. high heat of vaporization C. cohesion D. heat storage E. adhesion