A statement, "in prokaryotes, translation is coupled to transcription" simply means
a. RNA translation occurs before DNA transcription
b. RNA polymerase is tightly bind to DNA
c. translation and transcription occurs in the cytoplasm
d. DNA transcription and RNA translation occurs simultaneously
Answer: d. DNA transcription and RNA translation occurs simultaneously
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Gene sequences that evolve at a constant rate can be used to ____
a. index the time of divergence between two species b. calculate speciation rates across lineages c. calculate speciation rates within different lineages d. index the number of extinct species within a lineage e. calculate extinction rates across lineages
What is the genotype of a dominant individual if, when selfed, some of its offspring show the recessive phenotype?
A) Either DD or Dd B) dd C) DD D) Dd
In chloroplasts, chlorophyll is contained in flattened sacs called
a) thylakoids. b) cristae. c) cisternae. d) vacuoles.
Non-disjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. If 18 pairs of sister chromatids segregate normally during meiosis II in cats (n=19) but we have non-disjunction of 1 pair, then at the end of meiosis II we will have
A. 3 cells with 20 chromosomes and 1 cell with 18. B. 2 cells with 20 chromosomes and 2 cells with 18. C. 2 cells with 19 chromosomes, 1 with 20, and 1 with 18. D. 3 cells with 18 chromosomes and 1 cell with 20. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about non-disjunction? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most 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?