Structures that appear along the synaptonemal complex during pachytene where genetic material is exchanged between nonsister chromatids are the ________.
A) chiasmosomes
B) telomeres
C) centromeres
D) recombination nodules
E) kinetochores
D) recombination nodules
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Which statement accurately describes global gene regulation in bacteria?
A) Sigma factors are not involved in gene regulation, only in attachment of the polymerase to the promoter. B) Alternative sigma factors that recognize different promoters are a mechanism of global gene regulation. C) E. coli cells devote more energy to the production of ribosomes during stress so that global gene regulation can occur. D) All promoters are recognized by all sigma factors.
Bacteria lack membrane-bound organelles
Indicate whether the statement is true or false
Which is incorrect about deep-sea organisms?
A. Some prokaryotes are photosynthetic there. B. Some prokaryotes live symbiotically within the tissues of heterotrophs that live there. C. Some prokaryotes extract energy from hydrogen sulfide. D. Some heterotrophic organisms obtain energy from debris that falls from above.
Which cell migrates to the thymus gland to mature?
A. T cell B. mast cell C. monocyte D. natural killer cell E. B cell