The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?
A. nitrogen fixation
B. osmotic pressure
C. pH
D. hydrostatic pressure
E. quorum sensing
Answer: B
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In general, microtubules disassemble and consequently pull the chromatids to the ends of the spindle. When does this occur?
a. during interphase b. during prophase c. during metaphase d. during anaphase
In addition to highly repetitive and unique DNA sequences, a third category of DNA sequences exists. What is it called, and what types of elements are involved in it?
A) dominant DNA; euchromatin and heterochromatin B) multiple gene family DNA; hemoglobin and 5.0S RNA C) moderately repetitive DNA; SINEs, LINEs, and VNTRs D) permissive DNA; centromeres and heterochromatin E) composite DNA; telomeres and heterochromatin
In meiosis I, sister chromatids
a. go to opposite poles. b. go to the same poles. c. have kinetochores facing in opposite directions. d. synapse with each other during the zygotene stage.
The comparison between Parazoa and Eumetazoa is best described by which of the following statements?
A. Parazoa have only one kind of cell whereas Eumetazoa have many kinds. B. The various kinds of cells of Parazoa do not form permanent associations into tissues or organs whereas Eumetazoa possess true, stable tissues. C. Parazoans are only haploid, whereas eumetazoans are diploid with haploid sex cells. D. Parazoans invert during their development whereas eumetazoans do not. E. All of the choices provided are correct.